the book of wise - cavity trays limited trays bowd2… · · 2012-07-20building details best...

BUILDING DETAILS

BEST PRACTICE GUIDE

WIS

E D

ECIS

ION

STHE

BOOK OF

Specialism • Experience • Service

DAMP-PROOFING

CLOSERS

VENTILATION

ASSOCIATED ITEMS

RADON/METHANE

FIRE/ACOUSTIC STOPS

Vol. 40

Our conditions of supply apply in all instances. A copy of the company’s terms and conditions is available upon request. Cavity Trays ltd shall not be liable for any consequential loss whether this arises from a breach of duty in contract or any other way. The summary conditions appertaining to the cavitray product performance undertaking appear in our technical manual. Study of themain manual is essential. Quoted despatch dates and carriage methods apply to the anticipated date of dispatch and the anticipatedmode of carriage only and speed shall not form any part of any contract. As part of our continuous product development, we reservethe right to amend or change specifications without notice.

In the 1920’s a West Country family of builders started fabricating “dampcourses and otherdevices to allay the fears of the unpredictable and volatile English climate”. Today the fourthgeneration of the same family continue the tradition.

The Company is now called Cavity Trays Ltd and can claim more experience, more casehistories and more know-how than any other company in this specialised field.

Cavity Trays Ltd is the first and only tray manufacturer awarded European Technical Approval– there is no higher standard.

Cavitrays with high performance categorisation are accompanied with product performanceliability, for the benefit of Architect, Builder and Client.

Welcome to Cavity Trays Ltd of YeovilThis pocket-sized handbook illustrates common construction details and problems. It identifiesthe products that can solve and satisfy your construction compliance requirements.

Carry this handbook with youUse the freephone number to obtain immediate advice. If you require a non-standard item, pleaseask. We have an entire department dedicated to problem-solving and producing solutions forprojects of all sizes and types. We manufacture standard and bespoke products for newconstruction, renovation, repair and remedial work. Please use our expertise; we are at your service.

Better for architect, builder and client, and peace of mind.

Enjoy the benefit

of four generations

of experience…

Cavity Trays Limited, Administration Centre, Yeovil, Somerset, England BA22 8HU*in 2004

“I’ve a detail like that, except”…This pocket-sized handbook illustrates common construction details. Use thishandbook to identify solutions to your construction requirements. If you cannotsee what you are after or you find yourself thinking the words above, freephoneus and ask about the numerous variations and splendid solutions available.

“Give me an example”…Turn to page 53

It shows a cavity barrier that is multi-functional. It acts as a fire stop and anacoustic stop. Importantly it has sloping upper and lower surfaces that dischargepenetrating water forward.

If you have an unusual or different application, just ask. We can usually supplybespoke versions. Best practice and functionality at all times.

“Can you work it out for me?”…Cavity Trays Ltd is the longest-established organisation in this specialised field.We will be delighted to prepare schedules, drawings and costs. We do notcharge for such advice. We welcome the opportunity of submitting proposals foryour consideration.

“Help me make my decision”…We have a proven track record unmatched by any other specialist in this field.The only cavity tray manufacturer awarded European Technical Approval.*We also offer Architect, Builder and Client an accompanying benefit. Productperformance liability protection.

“A handy book to keep in my pocket”Cavity Trays Ltd - at your service.

More InformationExtensive product details and applications may be found withintechnical publication vol 22: ‘Protecting the Building Envelope’.

Helpdesk 0800 7311779 Telephone 01935 474769Fax 01935 428223 Email [email protected] www.cavitytrays.com

4 CONTENT

telephone 01935 474769 or visit www.cavitytrays.com

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Type B Vertical DPC Tray 7

Type BA Barrier Arch 7

Type C Cavitray 8

Cavicloak Preformed Damp Course 10

Type CD Cavity Dropcloak 13

Cavilintel 14

Caviroll Premium DPC 15

Combined Edge Insulators 15

Profiled DPC’s for Timber Frame Construction & SIP Constructions 16

Type DPC Profiles Raft Construction 16

Type E Cavitray 17

Type E Remedial 19

Type F Corrugated Flashing 20

Type G 21

Type GBFICS 22

Type GBPWIS 22

Type J Support and Closer 23

Type K Circular Cavitray 23

Type L Lintel Stopend 24

Type L90 Stopend 24

Type LTT Threshold Tray 25

Coneslate 25

Type M Cavitray 26

Masonry Support Cavitray Systems 26

Type P Cavitray 27

Type PWRB Party Wall Barrier 27

Type Q Arresting Barrier 28

Type R Cavitray 28

Rainscreen Baffles 29

Type S Soaker Units 29

Type TFC Timber Frame DPC 30

Type TST Threshold Tray 30

Unleaded Gable Abutment Tray 31

Type U Cavitray 31

Type W Cavity Perp Weep/Ventilator 33

Type W Extension Duct 33

Type W Optional Cover 33

Pyramid Weep 34

Beak Weep 34

Euroweep-Vent 35

Small Adjustable (Telescopic) Weep 35

Type X Cavitray 36

Type X Remedial 38

Type X Multicourse 38

Flashing Options 39

Curved Cavitrays - on Plan 40

Type Y Mullion Cavitrays 42

Type Z Fixing Strip for DPC 42

CLOSERS

Acoustic Stops and Thermal Barriers 45

Bespoke Traditional Closing Service 45


CONTENT 5

Continuity Closer 46

Type D Damp Course (Vertical) 46

Type DIP 47

Type FWC Five Width Cavicloser 47

Type H Cavicloser 48

Quickcloser 48

Sash Frame Insulated DPC 49

Type WCA 49

Type WCA Maxi Range 50

Type V Cavicloser 50

MWR Type V170 Cavicloser 51

Cavi120 Type V Closer 51

Cavi60 Type WCA 52

Cavi60 MWR V170 52

Cavi60 SAF Horizontal Barrier/Stop 53

Cavi240 SAF Vertical Cavity Barrier/Stop 53

Cavi240 Type CFIS 54

Cavi60 MWR 200 54

VENTILATION

Ventilation at Floor Level 56

Ventilation Through Walls 61

Ventilation at Eaves & Fascia Level 64

Ventilation via the Soffit 71

Ventilation Where Roofs Abut Walls + Through the roof 75

ASSOCIATED ITEMS

Type CRSS Running Soaker Strip 79

Type ECSC Eaves Continuous Slate Course 79

Type RBS Roof Bonding Strip 80

Type VG Valley Gutter 80

Hardedge Strip 1500 81

Type I In-screed Services Duct 81

Type LAD Loft Access Door 82

Downward Hinging Loft Access Door 83

Cavi120 Type PC Lofthatch 83

RADON/METHANE

Sump Provision under the Building 87

Oversite Protection Type N Sitesealer Membrane 87

Oversite Protection

Footprint Radon Membrane 88

Protection Through the Wall 88

Gas Out & Water Out 89

Sealing Interruptions of the Oversite Membrane 89

Damp-ProofingDamp Protection of the Building Envelope

IMPORTANTEvery building must be designed and constructed in such a way that there will not be a threat tothe building or the health of the occupants as a result of moisture from precipitation penetratingto the inner face of the building. SR Mandatory 3.10.

Products and systems are for use in masonry constructiondesigned in accordance with the BS EN series of Eurocodes.

PD 6697:2010 states guidance on structuralconsiderations affecting the selection of DPCs,trays and flashings is given in BS 8215.

However, please be aware we identified anddrew attention to errors in the original BS8215:1991 on pages 7 & 8 relating to steppedDPC provision in gables. Importantly the designswithin this section avoid those shortcomings andhave been awarded European TechnicalApproval / LABC product approval.

PD 6697:2010 also makes reference to a DPCwithin a parapet wall sometimes steppinginwardly and we believe this to be in error assuch construction is susceptible to water ingress.Our design for parapet walls avoids thisshortcoming and removes the associated risk.

Products and systems are subject to aperformance undertaking for the benefit ofArchitect, Builder and Client.


DAMP-PROOFING 7

Type B Vertical DPC TrayuseProvides vertical DPC element to existing cavitywall.

solutionThe Type B semi-rigid vertical cavitray may beintroduced into the existing exterior skin of a cavitywall following vertical cutting of the masonry toprovide a 4mm slot.

The Type B establishes a permanent DPCpresence. Addressing this vertical requirement inaddition to any horizontal requirement (see Type E)is important where a skin changes status by virtueof an extension being added to an existingstructure. Where metal profile links are employedto attach masonry and the existing wall is not cut-out to create

T-junction cavity continuity, the Type B approachcan introduce DPC integrity. See separate pageentry for Cavilinks.

data• Black polygormac DPC• Standard 2400mm lengths• B1 suits standard brickwork skin• B2 150mm skins• B3 225mm skins• See Masonry Cavilinks under separate

heading available with this product

Type BA Barrier ArchuseProvides a moulded DPC barrier only for arches,thus permitting traditional construction.

solutionThe type BA barrier arch is a DPC, supplied ready-shaped to suit the arch opening. The type BA isincorporated within the cavity wall with its basesection positioned on the traditional centring. Thebarrier arch DPC is normally returned into theinside skin, at the appropriate level. The type BA isparticularly appropriate for wide arches becauseit can be supplied in connecting sections.

data• All popular styles and sizes available• Maximum overall length in one piece

2400mm• Wider arches supplied in linking sections• Manufactured from thermo stable DPC• Provides correctly shaped DPC whilst

permitting traditional construction• DPC element is established without doubt,

at intrados level

8 DAMP-PROOFING


Because Type C cavitrays are profiled from rigidsolid DPC, they support themselves. They do notrequired building into the inside skin. Self-supporting Type C cavitrays can thus beused with either traditional or timber frameconstruction. Alternatively, if a return into theinside skin is desired, it can be provided uponrequest. Trays can be supplied for anydesignated cavity width and are biased-formedto take-up the actual cavity encountered.

Type C CavitrayuseA range of preformed, ready-shaped DPCcavitrays for use with proprietary metal lintels.Also suitable for use with cast in-situ, prestressedand precast concrete lintels.

solutionType C cavitrays provide a harmonising yetindependent DPC tray for all lintel openings.Manufactured from solid DPC, Type C cavitraysare pre-shaped to suit customer’s specificconstruction needs. Being pre-shaped means theinstaller establishes exactly what is being built intothe cavity wall, whilst eliminating the dangers ofdistortion and misplacement. Wastage is alsoeliminated as Type C lengths can be scheduled tosuit the build programme. All shapes, sizes andprofiles available. Type C cavitrays arecompatible with our stopends and perpweep/vents. Profiles available to suit Catnic,Keystone, I.G., Hill Smith, Birtley, Bat and otherpopular lintels including all concrete lintels.

data• Base thickness of 1.5mm, polypropelene• Strong preformed profiles• Adjustable stopends• Numerous cavity widths accommodated.• Avoids length wastage• Securtex finish promotes superior mortar

adhesion

Type C Tray used with typical metal lintel.


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Typical examples of someprofiles. Type C Cavitraysare suitable for use with avariety of lintels. The profileof each Type C may finishagainst the inside skin, oralternatively be built intothe inside skin. This secondoption can necessitate useof a larger profile to marrywith the course height.Always stipulate whichversion you require.

1 2 3 4

5 6 7 8

9 10 11 12

13 14 15

10 DAMP-PROOFING


Cavicloak PreformedDamp CoursesusePreformed moulded cavicloaks for use withincavity walls. Cavicloaks are shaped to exactly fitthe construction detail intended. Cavicloaks areoffered in a wide range of standard sizes. Also tailor-made to suit specific applications.

solutionThe use of preformed cavicloaks eliminates theneed to fabricate on site. The ready-moulded unitsprovide correctly fitting, harmonising componentswhich ensure DPC integrity to features such ascorners, columns, steps and angles. Moulded fromsolid DPC, the preformed cloaks offer flexibilitywithout sagging or distorting. Options include theself-supporting upstand terminating within thecavity or alternatively returning into the inside skin,depending on application.

data• Standard and purpose made cloaks• Solid polypropylene A1 DPC• Securtex surface aids adhesion• Preformed moulded components• Link-seal jointing• Upstand termination option• No distortion or sagging• Efficient site scheduling and stock control

Change of Profile / Change ofDirection / Change of LevelCC/CLCP/IC/0270

Type C/P with pipe projectingthrough cloak CC/CP/0360

StopendCC/SE/0160

Internal AngleCC/IC/0320

Cloak around verticalvent sleeve CC/CS/0440CC/CS/050

Party Wall link cavicloakCC/PWL/0220

Radon External AngleCC/RAD/EC/0260

Column CavicloakCC/C/090


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Column Cloak (Supplied intwo pieces) CC/CC/0270

Window Cill tray (Dependant on size) CC/UC/0350

Stopend CC/SE/0410

Step down cloak (Large step) (150mm - 600mm High)CC/LC/0340

Threshold CavicloakCC/S/060

Radon Internal AngleCC/RAD/IC/0250

Balcony CloakCC/BC/0570

Corbel CloakCC/CC/0580

Windpost CloakCC/WC/0280

Change of Profile CloakCC/COP/0190

External AngleCC/EC/0390

Internal Corner / ColumnCloak CC/ICC/0510

Internal Angle CC/IC/0370

External AngleCC/EC/0380

Windpost Cloak (Handed) CC/WRS/0290

Stopend cavicloak CC/SE/040

12 DAMP-PROOFING


Change of LevelCC/LC/0610

External Corner/ Column CloakCC/EC/0620

Threshold Step Down Cloak CC/TS/0630

Reveal Protection CloakCC/RP/0600

Change Profile / Corner CloakCC/CPC/0590

Column cloakCC/C/0400

Cloak over ventCC/SCC/0330

Windpost cloakCC/WC/0430

Level Change /Externalcorner CavicloakCC/S/0110

Change of Level / Change ofDirection CC/SLIC/060

Column / Windpost CloakCC/CWP/0520

Masonry Support / CloakCC/MS/0530

Change of Profile /Intersection SealCC/CPC/0540

Column CloakCC/C/0550

Level ChangeCC/LC/0560

Step down cloak (Small step) CC/LC/080


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Type CD CavityDropcloaksuseTo prevent damp penetration via a masonryfeature within an external skin, withoutenvelopment within that skin. Thus structuralintegrity is unaffected and masonry mass ismaintained.

solutionArchitectural masonry features such as dentils,running break stones or stringcourses oftenrestrict, reduce or interrupt the cavity plane. Thus it is always desirable to minimise andprotect against the affects of any volume wash ofwater around such features. If such masonryfeatures occur towards the top of a cavity wall,any dpc in the external skin separates themasonry below from the masonry above. Thebonding is broken and the masonry mass isisolated. The external skin is weakened at the verypoint where it should ideally be strengthened.

Type CD Cavity Dropcloaks can eliminate suchproblems. Dropcloaks are preformed dpc sectionsmoulded in petheleyne biased to take-up a widerange of cavity dimensions. Type CD Dropcloaksdo not break or affect the bonding of the externalskin. Structural stability is enhanced rather thanreduced, weakened or isolated. Cloaking to guard

against damp transmission is achieved droppingfrom the inner leaf only, but protecting from dampin the outer leaf.

data• Black petheleyne• Dimensioned to suit all cavitray and

Cavicloak applications• Stopend facility and expansion facility

Where horizontal cavity stops or barriers are alsoincorporated to comply with Robust Details Part E,Dropcloaks prevent penetrating water tracking onthe top surface of the barrier.

14 DAMP-PROOFING


CavilinteluseLoad bearing lintel with security shutter.

solutionThe Cavilintel is designed for use with cavity walls.Unlike a conventional lintel, the Cavilintelincorporates a roller shutter within its box design.Electrically operated with an internal manualoverride facility, the shutter descends to protect thedoor or window opening under. The Cavilintelpackage includes shutter guides that are built intothe cavity wall reveals. The shutter ends are thusretained within the channels behind the externalmasonry skin. The Cavilintel is additionallyaccompanied with insulation and damp protectioncavitrays at head and sill level, and provides acomplete opening package. Developer may offercustomers additional security of openingsimmediately or benefit of upgrading at a laterdate.

data• Bespoke design product• Stainless steel or galvanised steel• Shutter colour choice• Cavitray damp protection measures included• No mechanical surface fixings• Safety manual override internally

Notes


DAMP-PROOFING 15

Caviroll Premium DPCuseGeneral purpose DPC suitable for specific horizontaland vertical damp proofing of cavity walls.

solutionPremium Caviroll DPC is manufactured from solidpolyethylene which conforms with BS6515. Itpromotes excellent tensile strength and retainsflexibility through a temperature range of minus50 degrees up to plus 80 degrees centigrade.Premium Caviroll DPC is a homogeneousmaterial, possessing superior waterimpermeability. Both sides of the DPC have agripgrid surface to promote adhesion and unitywith the mortar. Premium Caviroll DPC is a cleanand easy to handle material. It is tough, flexibleand suitable for use as a general purpose rolldamp-proof course.

data• Available in standard 30 linear metre rolls, in

the following widths: 100, 150, 225, 300, 375,450, 600 & 900mm

• No water absorption. Water permeability - 0.00036 kg m2h atm

• Tensile strength - 1.266 kg/mm2.• Tearing elasticity - 800%• Temperature scale - Flexibility from -

50 degrees up to +80 degrees centigrade• British Standard DPC with gripgrid surface• Impermeable

Combination EdgeInsulatorsuseCombination perimeter edge insulator for usewhere floors and walls meet to provide thermal,acoustic and DPC qualities.

solutionGround bearing slab construction commonlyrequires perimeter edge insulation at its junctionwith all walls. Similar requirements exist with otherforms of construction, to prevent cold-bridging. Byselecting an appropriate combination edgeinsulator, the thermal and acoustic arrangementcan be accompanied by damp-protection, actingin addition to or as part of the ground floor DPMconfiguration. The semi-rigid DPC is preformed at90° to maintain shape and placement and provideeasy lapping and interfacing with any adjacentDPM . Thus barriers can be incorporated at screedlevel (above slab) or below slab level, pending theDPM configuration. This extends the constructionoptions available to meet requirements of BuildingRegulations and Robust Details where the overallresistance of the edge is required to achieve3.04m²K/W minimum.

data• Provides inner skin DPC• Uninterrupted vertical protection• Integrates with oversite membrane• Insulation cushion to perimeter

16 DAMP-PROOFING


Profiled DPC’s for TimberFrame Construction & SIP SystemsusePre-shaped DPC’s for use under sole plates intimber frame and construction utilising structurallyinsulated panels.

solutionTraditional roll dpc can distort and misshape duringplacement and operations on site. Profiled DPC’sare accurately dimensioned semi-rigid shaped dpc’sthat permit the installer to establish consistent dpcprotection around the base of timber framed walls.Laid and lapped under the sole plate, the profilesrise vertically to protect the inner face of the plate,as depicted in NHBC Standards 6.2. They can alsoextend inwardly. In so doing the oversitemembrane can benefit both horizontal andvertical interfacing. Profiled DPC’s will not extrudeunder load and functionality is unaffected bynormal packing/point loading. Internal/externalangles and bespoke profiles available.

data• Black petheleyne• Will not extrude or seep under load• Close fits timber – no sagging or damage• Consistent quality of build• 2400 x 100 x 112 (180)mm• Bespoke options

Dotted line shows alternative extended profile

Profiled DPC’s for RaftConstruction / GroundBeamuseTo provide perimeter DPC when constructing usingraft foundations or where the cavity does notcontinue below DPC level.

solutionDPC Profiles for raft foundation construction aremanufactured from accurately dimensionedsemi-rigid shaped Petheleyne. They are beddedand lapped on the foundation prior to thecommencement of masonry being laid.

Unlike roll material, the DPC Profile cannot sag ordistort and fulfils the requirements of NHBC 4.5D12 –D13. The cranked DPC Profile ismanufactured in a range of heights correspondingwith masonry course heights. Because there is nocontinuation of cavity by virtue of the concrete raft,water is drained out of the structure usingCaviweeps appropriately positioned in perp jointsaround the structure at DPC level.

data• One-piece DPC wall protection• Matches raft edge dimensions• Integrates with oversite membrane• Establishes gas protection provision


DAMP-PROOFING 17

Type E CavitrayuseTo introduce a horizontal DPC at roof intersectionlevel in an outside wall which has become an insidewall, by virtue of an extension being built.

solutionThe Type E is a preformed DPC cavitray which isinserted into an existing cavity wall. The Type Erequires only one course of bricks to be disturbed,with just a few bricks removed at any time. The self-contained Type E cavitrays are the lengthof two bricks, and clip together, so long runs areeasily and quickly created. Preformed angles caterfor corners and piers. Each unit has stand-alonedischarge via a weep. Suitable for all popularcavity widths because the cavity upstand of theType E is hinged and adjusts to always suit the ‘as-found’ cavity width.

data• Standard two brick length cavitrays with

integral perp upstands• Material - solid DPC polypropylene• Positive jointing integral anticapil clip

eliminates gluing, sticking or overlapping• Shape and depth of projecting lip prevents

discharge water permeating the bedding joint - an often overlooked consideration on exposed sites

• Adjustable cavity upstand accommodates cavity size 50mm to 140mm

Type E cavitrays used with a lead flashing, where a new roofabuts an existing wall.

Rain penetratesthe externalskin, whichbecomes aninternal skinbelow the newroofline.

Type E cavitrayswith extendedflexibleupstands areparticularlysuitable for non-standard orvarying cavities.

18 DAMP-PROOFING


2

2

3

3

4

54

1

1

Type E External Angle Right Hand Type E External Angle Left Hand

Type E Internal Angle Left Hand Type E Straight 450mm Long Type E Internal Angle Right Hand

Step 2 - One cavitray is insertedtogether with the flashing intendedfor dressing over the skirting of theroof finish (flashing approx 50mminto wall). Lead flashing is notrequired in most remedialapplications.

Step 3 - Two bricks are replaced in thewall into the cavitray. They are jointedand securely slate pinned, leaving thewall above safe and firm. A weepvent is incorporated in themiddle perp. Two more bricks areremoved again forming a three brickspace. The flashing is extended and asecond cavitray inserted. The integral Uclip joins the trays, ensuring that nowater can penetrate. Two more bricksare inserted and a weephole againformed. There are now two adjoiningbut completely self-contained cavitrays.The method is continued until therequired run is completed. (Always bedon mortar. Do not dry bed.)

Step 1 - Three bricks are removedfrom the wall forming a 675mmopening (an angle grinder/cutter isideal for cutting out).

218

113

450

330

225

327 215

228

116


DAMP-PROOFING 19

Type E RemedialuseTo introduce an effective DPC into an existingcavity wall in which the original high level dampproofing element has been omitted, damaged,incorrectly formed or is suspect/faulty.

solutionWhen dampness is experienced at a horizontalintersection, roof junction, ringbeam or over awindow or door opening, the Type E may be usedand introduced as a remedial DPC, to arrest thepenetrating rain water. Type E cavitrays may besupplied in various lengths, widths and depths.Therefore the external skin masonry moduleencountered on site may be matched.

Long runs of trays are easily created, whilstmaintaining self-contained and stand-alone status.Installation is from the outside of the building only.

data• Self-contained units with stand-alone discharge• Hinged cavity upstand accommodates actual

cavity width 50mm to 140mm• Minimum masonry disturbance

Type E cavitrays used without flashing, over an existingopening where the original damp course has failed or hasbeen omitted. The exact course in which the cavitray isintroduced varies depending on the construction detail.

The Type E is available in an infinitechoice of widths and lengths.

Examples of purpose-made trays whichaccommodate cavitycolumns.

20 DAMP-PROOFING


Type F CorrugatedFlashinguseCorrugated flashing suitable for use with plasticroof sheets only.

solutionThe new Type F corrugated flashing units can beused on porches, lean-tos, outhouses,conservatories or temporary structures havinglightweight translucent corrugated roof sheeting.The Type F flashing unit incorporates a uniqueintegral hinge, usually making it suitable for anyangle of roof from 17.5 degrees up to andincluding 60 degrees. The units are fixed simply bypositioning before securing the top of sheet fixings,which then hold the units in place.

The Type F fits against the corrugations snugly,whilst the upstand springs to shape verticallyagainst the wall. The upstand can then be finishedoff with a flashing/cavitray.

data• Profiles: Standard 3”/75mm asbestos,

Standard 3”/75mm iron. Miniature, Grecca box profile 76/18, Grecca box profile 70/18, Box profile 16mm, Box profile 14mm

• Approximate dimensions 150mm x 85mm upstand x 715mm lengths

Notes


DAMP-PROOFING 21

Type GuseDPC system for general purpose applicationsincluding changes of level, diaphragm walls,roof intersections, building off the solid, etc.

solutionThe Type G is supplied in preformed lengths andpreformed angles. Long runs can be rapidly laidwith adjoining sections interlocking via integralstopends that coincide with masonry perp joints.All arrested water is discharged via caviweeps.The standard Type G profile suits cavity widthsfrom 50mm up to 140mm ands is available inlengths to suit masonry coursings. The Type G isusually supplied with a flashing already attachedor with an external bed lip. The Type G issuitable for traditional and timber frameconstruction and cannot deform or misplace likeconventional roll dpc.

data• Adjusts to suit cavity widths up to 160mm• Supplied with or without flashing attached• Integral stopends interlock to create long

tray runs• Self-supporting, unrestricted cavity compartment• Not dependent on both skins aligning• Traditional or timber frame construction

Type G cavitray with leadflashing attached.

Type G cavitray used inringbeam / concreteframe application.

Type G cavitrayswith attached leadflashings provideprotection to thefront horizontalintersection. Notethe Type X traysused above thesloping abutmentterminate with anexternal angle. This provides aprotective link withthe Type G trays.

Universal external angle. 220mm x 220mm.For convenience, this angle is not handed and may

normally be used for most external angle applications.(External angles specifically left or right -handed are

available to special order)

Universal internal angle. 120mm x 120mm.

Type G cavitrays are now also available with a synthetic flashing attached instead of a lead flashing. See separate entryon page 39 headed Synthetic Flashings, which lists details. State clearly on your instruction if you require this option.

22 DAMP-PROOFING


Type GBFICS Ground Bearing FloorInsulating Cavitray SystemuseTo insulate, provide horizontal dpc, cavitrayprotection plus radon and methane cavity barrierintegrity at ground floor level.

solutionWhen installed around the perimeter of abuilding at ground floor level the requirements ofthe Robust Details can be satisfied with use of theType GBFICS. Manufactured from profiled semi-rigid damp course, the Type GBFICS provides thehorizontal dpc requirement to both inner andouter skins of the cavity wall. At the same time thecavity is also capped, creating an integral barrierto guard against radon or methane gas risingupwardly via the cavity and permeating thebuilding envelope. To maintain gastight integrity,the inboard section extends sufficiently to link with a gas-grade slab membrane. The downward projecting section of the TypeGBFICS protects the membrane from damagewhere it rises against the inside leaf.

data• One placement multi-compliance protection• Preformed angles, steps and links• Profile dimensions varied to suit site requirements

Type GBPWIS Ground Bearing PartyWall Insulating SystemuseEliminates temporary formwork, creates cavity,provides party wall slab insulation with dpccorroboration.

solutionThe Ground Bearing Party Wall Insulating System issecured in position between semi-detached unitscentrally along the line of the party wall. It permits the oversite concrete to then be laidwithout the need of temporary formwork ormasonry. The Type GBPWIS is thus enveloped withinthe construction and additionally provides slabedge dpc corroboration with cavity insulation infill.The system is available in dimensions to suit all cavitywidths and slab thicknesses. If an open cavity belowslab level is required, the insulation can be removedafter installation.

data• Petheleyne black dpc, 2mm• All sizes manufactured in 2.4m lengths• Profiles to suit, example: 300mm base x

150mm high x 75mm cavity• Polystyrene insulation infill• Aids easy construction of robust construction

arrangement


Type J Support and CloseruseProvides DPC support and closes cavity underparapet copings. Also provides means of closingcavity in open eaves and other eaves details.

solutionParapet construction requires a DPC immediatelyunder the coping. BS5628:Part 3 qualifies themanner in which the DPC must be supported. TheType J closer fulfils the requirements of the BritishStandard, and also the N.H.B.C. performancestandard, chapter 6.1, S4 (c) to (d). Theconventional cavity parapet is normallyterminated with copings, under which a DPC isbedded and positioned. The width of the DPCmust be sufficient to slightly overhang the width ofthe parapet masonry. Support of the DPC isrequired where it crosses the cavity.The Type J is designed for such purposes.J1 = 130mm x 30mm x 2mm/2.5mm.J2 = 150mm x 30mm x 2mm/2.5mm.

data• Standard lengths 2400mm• J1 closer make it suitable for use in cavities

from 50mm up to and including 90mm• J2 is a larger closer suitable for use in cavities

from 90mm up to and including 130mm• Material PVCU, Type 4• Available with insulated infil

Type K Circular CavitrayuseCavitray damp course for circular windows.

solutionThe Type K cavitray is manufactured from solidDPC and is supplied in one piece ready toreceive the circular window. It fits snugly aroundthe window frame, providing a 360 degreebarrier. The inside skin of the cavity wall and thesides of the circular window frame are protectedfrom dampness.

The unique design of the Type K cavitrayaccommodates numerous cavity widths andnumerous frame positions. The cavitray travelsvertically downwards within the cavity, until it passesthe bottom of the circular window. At this pointintegral balloon mouldings force the hinged basesection forward and guide water to dischargesafely. Type W weepvents may be incorporated toaid cavity wall ventilation if appropriate.

data• Standard dimensions include 470mm,

600mm, 630mm, 675mm, 700mm, 750mm, 800mm

• Special sizes available• Thermo-stable polypropylene DPC type 6,

heavy-duty, black• Optional polystyrene thermal collar• 360 degree total protection

DAMP-PROOFING 23

24 DAMP-PROOFING


Type L Lintel StopenduseLintel stopends for use at the ends of most popularDPC steel lintels/damp courses/trays. Nowrecommended by N.H.B.C.

solutionThe use of the Type L lintel stopend quickly andeconomically introduces a lintel feature whichremoves the problems and dangers experiencedwith volumes of water being directed into the cavity.This stopend is adjustable to suit most popularlintels and lintel damp courses, cavitrays etc.Incorporated into the moulded base of the lintelstopend is a butyl anchoring strip, which enables itto be secured towards the ends of lintels etc, in themost appropriate position to suit the masonry perpjoint. Stopends do not disrupt the bond.

When fitted, discharge from lintels is directedthrough masonry weeps, and we refer to ourweepvents.

data• Durrpolyethylene 6/A, colour black• Adjusts to suit different shapes of lintel, DPC

or cavitray• Integral butyl anchoring base• Promotes compliance of the latest

N.H.B.C./Building Regulation requirements• Compatible with our weep vents• Packed in boxes of 50

Type L90useRight-angled stopend for use with vertical backlintels.

solutionThe L90 stopend differs from our standard Type Lbecause it does not adjust and is intended for usewith lintels, DPCs and trays with vertically risingbacks. A butyl anchoring strip on the base of theL90 secures it in position in the selected perp joint. This product is recommended for surfaces thatrise vertically - see adjustable Type L if the surfaceis sloping/leaning back.

data• Polypropylene.• Colour black.• Integral butyl anchoring strip.• Packed in boxes of 50.

Type L90 This stopend has a 90° upstand and isused with lintels, trays and damp-courses risingvertically in the cavity.

The adjustable Type L can service a wide range ofsloping upstands and cavity widths.

Cavities 50mm to 100mm maximum on 150mm upstandrise. Cavities to150mm on 225mm upstand rise.


Type LTT Level Threshold Tray (Threshold Isolation DPC)usePermits internal and external floor levels tointerface at an opening within a cavity wall.

solutionThe Type LTT encapsulates the threshold masonry sothe transmittance of damp from the exterior skininwardly or from the inner skin upwardly is preventedregardless of the manner the flooring is interfaced.The Type LTT is available in a range of standardopening sizes. In isolating one of the areas mostsusceptible to damp transference, the Type LTTpermits abutting flooring, abutting insulation anddpc’s / membranes to continue over an inner skinand converge with an exterior skin that itself isisolated from dampness at the point of convergence.

The Type LTT is compatible with our range of Caviclosers and togetherthey provide a systematic and consistent approach to construction ofopenings within cavity walls. *Externally the dpc wraps vertically aroundthe masonry at either side of the opening to prevent any pooling / wind-driven water permeating the protected surfaces. *Following installation ofthe frame and dependent on the sill profile, these end wraps may betrimmed, conditional on their functionality not being compromised.

data• Level threshold compatible• Permits floor finishes to interface• Sizes for all opening dimensions• Ready-shaped solid polypropylene DPC

ConeslateuseTo weatherproof where a soil pipe penetrates apitched roof of tiles, slates or contoured sheet.

solutionUse of the Coneslate eliminates the necessity for thecontractor/plumber to purchase a conventionalslate of a specific pitch. The tapered shape is alsobeneficial in terms of easy telescopic storage andreduction in the accompanying risk of damage.This 30 degree Coneslate has an angle toleranceof plus or minus 10 degrees, thus accommodatingpitches from 20 degrees to 40 degrees.

data• Lead to BSEN 12588• Suits roof pitches of 20 degrees up to 40 degrees• Easy storage• Eliminates the problem of waiting for a

specifically angled slate

DAMP-PROOFING 25

Stacked packs andbespoke fabricationsundertaken

26 DAMP-PROOFING


Masonry SupportCavitray Systems

usePreformed DPC trays for use with masonrysupport systems to arrest and dischargepenetrating water at optimum level.

solutionWhen constructing off a masonry support system,the DPC is commonly incorporated at a higherlevel than is ideal. This compromise is because ofthe difficulties in bringing together and achievinga consistently profiled relationship between metalsupport and the roll-out material. Thiscompromise can permit penetrating water can beretained within the masonry sitting on the anglesupport. In the long term the masonry can sufferdiscolouration through water retention. In contrastpreformed masonry support cavitrays are exactlyprofiled to sit within the support. They provideprotection and weep evacuation at the optimumlevel. A consistent standard and quality of detail isbenefited.

data• Profiles available to suit most masonry

support systems• Tensioned self-supporting tray format• Cavity width biased designs• Black polypropylene• Project appraisal and scheduling undertaken

Type M CavitrayusePreformed cavitray for use over standard meterboxes (gas or electricity).

solutionThe Type M cavitray provides horizontalprotection against damp penetration where acavity wall accommodates an electricity or gasmeter consumer supply control unit (meter box).

The length of each tray suits standard meter boxesand provides sufficient overhang to each side. Thebase of the Type M suits standard thicknessexterior skins of brickwork, blockwork etc., whilstthe cavity upstand of the Type M automaticallyadjusts to suit most cavity widths from 50mm up to140mm.

data• Standard tray length 600mm• Standard profile as illustration• Cavity upstand overall height 150mm • Cavity upstand adjusts to accommodate cavity

sizes from 50mm up to 140mm• DPC - polypropylene, colour black• Suitable for traditional build and timber frame

construction


DAMP-PROOFING 27

Type P CavitrayuseTo weatherproof parapet walls.

solutionThe Type P cavitray is a rigid horizontal DPC,manufactured in long lengths. Preformed anglesenable the complete installation of a parapetdamp course to be carefully planned andcontrolled. It is self-supporting and requiresbuilding-in to one skin only. Accordingly, thestructural stability of the parapet is enhancedwhen compared with parapet standard detailsand related problems. Water collected within thecavity can discharge against the inside face of thebuilding’s exterior skin. Penetrating watertherefore discharges regardless of the direction ofthe prevailing wind or rain, whilst also permittingthe cavity to breathe. Type P cavitrays can besupplied in almost any special size withdimensions to suit client’s particular needs.Adjoining lengths glove-lap to make up runs.Always state actual cavity width.

data• 2400mm overall standard length• 25mm external lip• 150mm cavity down-turn• Preformed internal and external angles

450mm x 450mm• 2.0mm tensioned solid polypropylene, black• DPC Securtex textured finish

Type PWRB Party Wall Rising BarrierusePrevents water transference from one dwelling toanother via the party wall. Acts as a gas-resistantmembrane link barrier from one membrane toadjoining membrane. Reduces construction cost.

solutionNHBC 6.6.2(d) deals with providing a means toprevent water originating from one dwellingcontaminating the adjoining dwelling via the partywall. The Type PWRB fulfils the requirements in a morecost-effective and functional manner. The barrierprojects upwardly in the cavity to provide protection,rather than vice-versa (that necessitates work to theslab to provide a channel to falls). The profile of theType PWRB is capable of holding back a greaterextent of water compared with the channel approach.The profile also makes interfacing considerably easierwith any perimeter cavity barriers that might beinstalled as part of contaminated land protectivemeasures. Type PWRB Party Wall Rising Barriers areavailable in numerous profiles.

data• Black petheleyne• Std lengths 2400mm x 500mm x 150mm upstand• Protects against adjacent property water

contamination• Acts as membrane link and dpc to base of wall• Eliminates need to shutter and cast channel

Dotted lines showalternative profilearrangement option

28 DAMP-PROOFING


Type R CavitrayuseIntegral shuttering tray/water check former. Alsosuitable for closing cavities.

solutionThe Type R is a two-function cavitray. Whenintermediate upper floors of concrete are cast in-situ, it is utilised to close the cavity and preventconcrete entering. In addition, the Type Rintroduces a water check to the underside of theconcrete, to prevent water tracking across thecavity. The upturned profile (rather than thedown-turned profile) is not susceptible toaccommodating course aggregate during thepouring of concrete, which might encouragecapillary action if air voids are present andpermit perimeter pooling.

data• Type R size 1 = 2400mm x 135mm overall

width with V section of 25mm x 25mm• Type R size 2 = 2400mm x 160mm overall

width with V section of 50mm x 50mm• Angles 450mm x 450mm• Standard 1.5mm solid polypropylene, black• DPC Securtex top textured finish• Also available in austenitic stainless steel• Dual function product acting as water-check

and also integral shuttering tray• Upturned profile eliminates dangers of

capillary action and pooling water

Type Q Arresting BarrierusePre-shaped DPC barriers to arrest water-washwithin cavity wall to specific areas or features.

solutionThe function of Type Q barriers is to invisiblyarrest and reduce water-wash from an area ofcavity wall above a given feature or constructiondetail. Masonry below the barrier level howeverstill remains damp and receptive to rainpenetration. The purpose of the barriers is toinfluence control of water volumes within a walland minimise damp transmission risk. Arrestingbarriers differ from conventional cavitrays andDPCs. The base dimension does not usually travelthe full width of the external skin. Arrestingbarriers can be supplied in almost any specialsize with dimensions to suit client’s particularneeds. Adjoining lengths glove-lap andSiliconbond to make up runs. Please state cavitywidth being used.

data• 1.5mm tensioned solid polypropylene,

DPC securtex textured finish• 2400mm standard overall length• Base dimension approximately 75mm• Upstand dimension 150mm minimum• Preformed internal and external angles

450mm x 450mm


DAMP-PROOFING 29

Rainscreen Baffles and FlashingsuseBaffles and flashings to arrest, channel anddischarge rain penetration in rain screenconstruction.

solutionOpen rain screens and pressure-equalised rainscreens place dependence on baffles and flashingsarresting and deflecting the kinetic force of drivingrain. Whilst the screen minimises the buildingwetting forces, a means to channel and controlwater that penetrates and gravitates behind thescreen face is an accompanying necessity.

Baffles and flashings are specifically profiled tosuit individual applications. It is usual for profilesto be angled to promote tolerance ofimbalanced air movement within the verticalcompartments. We will be delighted to adviseyou on your project.

data• Bespoke product details established

following project appraisal• Black polypropylene and stainless steel

material options• Accompanying stopends and drop

discharge units

Type S Soaker UnitsusePre-shaped soaker for use only with plain tileswhere the roof abuts a wall.

solutionType S Soakers are preformed moulded unitsmanufactured from lightweight high densitypolypropylene. Soakers are termed ‘dry units’as they are incorporated when the tiles are laidand do not require any accompanying wettrade working.

Type S Soakers are designed to be used withplain tiles only and are handed. Whenpositioned in accordance with best practice thevertical 75mm upstand rises tightly against themasonry providing a uniform medium overwhich flashings may be dressed.

The base of each soaker extends 100mm underthe tile and permits easy interleaving with theturn-down portion at the top of each closeraiding positive placement. The upper run-offsurface of each soaker has a smooth finish witha textured underside that rests on the tile surface.

data• Preformed ready to use• No incompatibility – inert material• Full rise upstand• Economical lead alternative

30 DAMP-PROOFING


Type TSTuseTo protect against damp and water penetrationaround sills and thresholds.

solutionThe Threshold and Sill Tray is a three sidedmoulded unit that is positioned on the oversiteprior to the laying of the screed.

The purpose is to provide additional measures toensure abutting DPC integrity where floor,membrane, sill, internal skin, external skin andvertical DPC meet. Manufactured in widths tomatch the opening structural dimensions, theType TST is popular with developers as a meansof creating and maintaining a consistent andfunctional build detail.

data• Ready-shaped solution for openings• Black petheleyne• Size: opening width variable x 485 x 115mm

upstands• Ensures DPC integrity and functionality

Type TFC Timber Frame CavitrayuseProvides dpc in both skins. Functions as methaneand radon (contaminated land) cavity barrier andcavitray. Interfaces with oversite membrane.Vertically laps with timber frame membrane.

solutionThe Type TFC is manufactured in solid pethyleynedpc, and is ready-shaped for immediate building in.Supplied in long lengths, the TFC section is beddedon mortar and in one placement provides the dpcpresence required in both the cavity wall skins. Thebody of the TFC spans the cavity and guardsagainst contaminated land gases such as radon ormethane rising and entering the building envelope.The Type TFC also extends both inwardly andvertically. The inwardly projecting profile interfaceswith the oversite membrane to maintain gas anddamp protection integrity. The upwardly risingsection laps and seals with the timber framemembrane.

data• Acts as dpc, gas barrier and cavitray• Interfaces with membranes• Arrests and permits weep discharge of

penetrating water• Preformed angles, steps and opening profiles• Joined using gas-seal link-bond strips

The Type TST Tray is available in dimensionsto suit all popular two-leaf patio door openings where the threshold upstand is minimal.


DAMP-PROOFING 31

Type U CavitrayuseFor use under brick or tile sills, providing a DPCand integral guide for sill formation.

solutionThe formation of a brick or tile sill is easilyaccomplished with the use of a Type U undersilltray. Trays are supplied in a variety of profiles tosuit the shape of sill required. Once bedded inposition, the bricklayer has automaticallyestablished an undersill DPC. The sill bricks or tilescan then be laid using the profiled tray as integralguide shuttering. The entire front section of theType U which projects forward of the masonry line,is fully detachable. An integral separating link,permits this front portion of the tray to be removed,once the mortar has cured. Type U undersill traysare now available with an optional 25mmpolystyrene insulation barrier, bonded to thevertical upstand. (subject to sill design or spacepermitting.) Specify clearly if this option is required.

data• 2mm black polypropylene• Securtex top surface finish• Standard profile illustrated• All profiles and lengths available• Provides DPC and integral shuttering• Puncture-proof and robust• Peel-away front tray section

Unleaded GableAbutment TrayAdvantage RangeuseDPC cavitray for stepped/staggered gableabutments.

solutionPreformed cavitray without an integral leadflashing attached. May be used as an alternativemethod of creating the damp course element only,where a sloping roof abuts a cavity masonry wall.This product is named Advantage, as it offersbenefits not available from any other unleadedcavity tray manufacturer. The Advantage unleadedgable abutment cavitray is intended for use byinstallers who wish to introduce their own flashingmedium at a later date. Each unit is moulded insolid DPC and has a variable cavity upstand facility.When incorporated within the external skin, themortar is raked out underneath the base of the traywhilst it is still green. At a later date lead or othersuitable flashing is cut and introduced within theraked out joint. Optional rake-out polystyrene frontstrip available.

data• Solid DPC polypropylene, AB• Specify pitch, handing and coursing size• Suits cavity widths, 50mm to 140mm

32 DAMP-PROOFING


Variations to the profile and variations to thematerial thickness can be accommodated to suitthe customer’s requirements.

65mm

110mm

40mm

103mm

48mm

55mm

The entire front section of the Type U whichprojects forward of the masonry line is fullydetachable. An integral separating link permitsthis front portion of the tray to be removed, oncethe mortar has cured.

The sill arrangement ideally ends at the edge ofthe opening and does not extend into the revealmasonry. Although there are exceptions to thisrule, edge termination does ease conflictingmovement provision, which is especially prevalentin timber frame construction.

Type U with tiled sill.

Traditional construction, tile sill

Expansion gap should always be left between windowsill and sub-sill. Siliconbond may be used at this pointto provide a resilient yet flexible union.

Timber-frame construction with brick sill

150mm

window opening


Type W Cavity PerpWeep/VentilatoruseDual-purpose perp weepvent.

solutionDPCs, lintel and cavity tray installations requireweeps to discharge collected water from thebuilding fabric. Ventilating of wall cavities, andenveloped construction is also necessary to avoid interstitial condensation. Type WCaviweeps/Cavivents ensure water is removedfrom the building whilst also encouraging thewall to breathe. Being dual-functioned, the TypeW takes advantage of the pressure differentialswhich exist in and out of the cavity. This aidsevacuation of cavity humid air. The NHBCstandards (4.4c.111) advise that the cavity belowDPC level and at eaves and verge level should beventilated. This requirement is fulfilled using TypeW weepvents.

data• Standard size 105/115mm x 65mm x 10mm

plus lockfit wedges• Standard Type W provides 320mm2 free air

space• BS polypropylene• Available in grey, black, beige, brown,

terracotta, white and clear

Type W Extension DuctuseTo extend Type W to accommodate masonry ofgreater thickness.

data• Material polypropylene.• Colour grey.• Size: 200/225 x 65 x 10mm.• 320mm2 air rating.

Type W Optional Coverfor use during renderinguseProtective front cover to protect grille of Type Wduring single or two-coat rendering.

data• Polypropylene• Florescent coloured• Boxed in 50s• Ensures the dual-function Type W caviweep/

cavivent promotes optimum performance

200mm

115mm

105mm

DAMP-PROOFING 33

34 DAMP-PROOFING


Beak WeepuseTo evacuate water from lintels, damp courses,cavity trays etc.

solutionThe beak weep provides an alternative way ofreleasing penetrating water from lintels and cavitytrays installed within a cavity wall. The beak weepmatches the height of a standard perp joint, buthas a reduced front section (beak) shaped to bealmost indistinguishable from the mortar joint.

The beak is finished in glass-clear polypropylene,and successfully merges with all colours of mortarand masonry making the beak weep unobtrusiveand difficult to detect. The discharge outlet is onthe beak underside, permitting water and particledebris to wash through and drop from the outlet.This shape also protects against wind-driven rain.

data• Standard size 65mm x 105mm• BS polypropylene/styrene• Boxed in 50s• Direct flow path (not restricted)• Drop outlet does not encourage build-up of

mortar debris• Beak protects against wind pressure• May be extended with use of Extension Duct

Pyramid Weep (Masonry bleed straw)useTo provide discharge route for water from lintels,damp courses, cavity trays etc.

solutionPyramid Weeps (or masonry bleed straws as theyare sometimes termed) permit discreet evacuationof water arrested within a cavity wall. Thepyramid profile is rarely noticeable whenincorporated within a standard mortar bed. Ifundersized or reduced gauging is encountered,the triangular shape permits the weep to still bepositioned within the bedding mortar but with itspeak rising into a vertical perp joint.

The Pyramid Weep is available in two sizes to suitmasonry skins up to a thickness of 225mm. PyramidWeeps may be appropriately positioned at regularintervals in normal situations and applications toprovide discreet and consistent discharge routes.

data• Sizes: 100mm x 8mm x 8mm x 8mm• Sizes: 225mm x 8mm x 8mm x 8mm• (May be cut to provide alternative lengths)• Polypropylene• Mortar grey colour• Flush Front• Direct bleed path• Packaged in 100 and 500


DAMP-PROOFING 35

Euroweep-Vent(Alternative to Type W)useThe purpose and function of the perp weep/ventilator is described on the previous pages(Type W). An alternative product is now availableoffering smaller overall dimensions but with highperformance categorisation.

solution Euroweep-vents are positioned within the perpjoints between masonry. Their function is twofold.They act as a weep to discharge water from DPCs,cavity trays and lintels.

They also act as ventilators to encourage the cavityto breathe. Euroweep-vents were developed andare now extensively used on the continent. Theycan also satisfy UK, N.H.B.C. and BuildingRegulation requirements. Compact size does notcompromise the performance of the Euroweep-vent which promotes excellent free airflow anddischarge behaviour.

data• Size 49mm x 87mm x 9mm• Free airflow approximately 300mm2 per unit• BS polypropylene available in grey, black,

beige, terracotta and brown• Integral baffles• Vertical front• Boxed in 50s

Small Adjustable(Telescopic) WeepuseTo weep via a perp joint.

solutionThe small adjustable weep is telescopic and adjuststo accommodate external skins built of differentthicknesses. Similarly, the rendered wall is instantlyand correctly accommodated. This telescopicfeature may be employed to project the smallweepvent forward of the face line when rendering,and pushed back to the face line upon completion.A further benefit of the small weepvent is the frontprotective cap. Following building-in it is removedrevealing a clear and mortar-free outlet grille. Thissimple facility ensures cleanliness. So little of thehidden adjustable small weepvent is visible itharmonises with most popular masonry andmortar styles.

data• 93mm x 24mm x 9.5mm, with telescopic

section providing additional 70mm• BS polypropylene or BS ABS in clear, grey,

terracotta or beige• Insect resistant grill• Protective cap promotes cleanliness• Telescopic feature ensures compatibility• Suitable for use with rendered walls, also

varying thicknesses etc• Boxed in 100s

36 DAMP-PROOFING


Type X CavitrayusePreformed DPC cavitray complete with anattached ready-shaped lead flashing to form astepped cavity DPC and flashing at the abutmentof a pitched roof with a cavity wall. The Type X isthe only “high performance” classified cavitray forgable abutments, and offers the builder numerousbenefits. Ideal for new-build applications.

solutionEvery stepped and every staggered gableabutment must be so constructed to preventrainwater and dampness from penetrating belowthe abutting roof line. This is because the externalskin changes status below the roof line andbecomes an internal skin. The system fulfils threebasic requirements:1 It prevents dampness from penetrating belowthe critical stepped roof line.2 It externally weatherproofs and flashes thephysical roof/masonry intersection.3 It also prevents the inside skin from becomingdamp.The high performance Type X cavitray speeds upoperations on site and ensures a good and knownquality of build. Type X trays are handed, to suit lefthand slopes and right hand slopes. Every tray is aself-contained unit, with its own ready-shaped leadflashing attached. Select long leads to dressdirectly over tiles, or alternatively short leads todress over the upstand of a secret gutter or soaker.

Unlike other systems, the Type X has anadjustable cavity upstand so it always suits theactual cavity width and is therefore alwayscompatible. Just bed in position and flush pointas the external skin is raised. At a later date thelead flashing may be dressed.

Standard brickwork courses.

75mm

Trays are handed. As youview the gable, the left-handtrays discharge to the leftand the right-hand traysdischarge to the right.

Left-handintermediatetray

Right-handintermediate

tray

Synthetic flashing option – see p39


Intermediate trayRidge tray

External angleunder an intermediate

Catchment trayunder anintermediate

data• Solid DPC petheleyne, AA• Lead flashing BS EN 12588• Specify pitch, lead length, handing and

whether external skin is brickwork• Water drip bars eliminate underbase

track-back• Correct mortar bedding depth is also

established as bar dimensions harmonise with front of tray section to aid stability and mortar integrity

• Integral cavitray sealing flap links with upper tray

• Feature on the tray end upstand arrests horizontal tracking at this vulnerable point

• Adjusts for cavities from 50mm up to 140mm

Allow one tray per course up each slope, Stipulateleft hand or right hand trays. Also whether long leador short lead flashings. The bottom of each slopeusually starts with a catchment tray (or angle if on acorner). The top usually requires a ridge tray.

Short lead flashing fordressing over upstand ofsoakers (Shown in widerpart insulated cavity).

Long lead flashing fordressing directly overroof tiles.

DAMP-PROOFING 37

Now also available with a synthetic flashing attached instead of a lead flashing. See separate entry on page 39. State clearly on your instruction if you require this option.

38 DAMP-PROOFING


Type X RemedialuseFor insertion into existing cavity walls, to introducea functional DPC and flashing where an existinghas failed, has been omitted, or is requiredbecause a new pitched roof is to abut. (eg.Extension or conservatory roof).

solutionThe upstand of the Type X cavitray is hinged, whichpermits it to be turned to horizontal status. In thisposition, the standard Type X cavitray takes up theheight of one brick course only, which allows itsintroduction into a cavity wall with the minimum ofdisturbance to the surrounding structure.

The cavitray is bedded onto the mortar as it ispushed into position, and at the same time thecavity upstand is allowed to take up its correctangle within the cavity. The amount of masonrywhich must be removed is kept to an absoluteminimum compared with most methods.

data See previous page.

Type X MulticourseuseCavitrays for gable abutments in sizes other thanstandard brickwork.

solutionBrickwork courses accept standard Type Xcavitrays. However, different course sizes aresometimes encountered and a range of gableabutment multicourse cavitrays are available toaccommodate different coursing heights.Multicourse cavitrays are based on the design ofthe Type X. They are proportioned to a accept avariety of walling materials and dimensions.

Examples include reconstructed, faced, naturaland concrete masonry, in course heights of100mm, 125mm, 150mm, 175mm, 200mm,225mm. The cavitray upstands are hinged to suitcavity widths from 50mm up to and including140mm. The tray base dimensions are suitable formasonry skins of thickness up to 125mm, beyondwhich special fabricated trays are available to suitall depths.

data• Lead flashing BS EN 12588• Specify pitch, lead length, handing, plus

details of the external skin thickness and course height

• Solid DPC polypropylene, AA

Upstand turnedto

horizontalstatus.


DAMP-PROOFING 39

Flashing OptionsuseFlashing material choices available on flashing-attached trays.

solutionLead flashing remains the most popular choice tohave bonded to our preformed trays. Alternativeoptions are available for projects wherecompatibility issues or visual characteristics are ofconcern.

Where an inert flashing medium can help maintainneutral balance in the presence of limestone,magnesian limestone, sandstone and somegranites, building design should always considerthe flow of water from limestone to other masonrymaterials and flashing mediums. Where continuityof metal type to match the roof finish ensures mostappropriate compatibility and visual continuity(example copper roof with copper flashings).

The synthetic flashing addition to our range is acomposite material consisting of aluminium meshenveloped within silian-modified polymer rubber.It is non-permeable and offers similar malleabilityto lead flashing. It will hold to shape and oncedressed can be additionally secured in place withadhesive if required. Resilient to temperaturesbetween -20° and + 70°. UV and ozone resistant.

data• Thermally stable• Malleable / stretchable• Choice of flashing colours• Available attached to some tray types or in rolls• No scrap value

LeadStandard BS EN 12588Thickness 1.8mm – code 4Weight m2 20.41kgs/m²Colours Natural

Synthetic PerformStandard BBA 09/4681Thickness 2.1mmWeight m2 3.6kgs/m²Colours Light grey,

terracotta, black

Copper Standard BS 2870 ASTM B370Thickness 0.55mm+Weight m2 kgs/m²- varies

pending gaugeselected

Colours Copper colouredprior to weathering

Aluminium Alloy Standard BS EN 485Thickness 0.6 /0.9mmWeight m2 kgs/m² – varies

pending gaugselected

Colours Aluminium silver

40 DAMP-PROOFING


Curved Cavitrays on PlanuseBespoke versions of Cavitray suitable for use incurved masonry and masonry forming structuresthat are circular or constructed with a face thatundulates.

solutionWhen a cavity wall is curved on plan, DPCCavitrays of matching radii ensure the protectionin the bedding course is uniform, flat anduninterrupted. Curved trays within the cavityensure the cavity compartment is adequatelyprotected and the cavity upstands are able toservice the maximum cavity width.

In comparison roll material is obliged to be laidin a series of straight lengths that cannot mirrorthe curve resulting in shortfalls from orprojections beyond the finished masonry face. Trays can be supplied concave or convex in thefollowing tray types.

• Curved Window and Door Openings• Curved Parapets• Curved Gable Abutments• Curved Horizontal Abutments• Curved Arresting Barrier Applications

Type C Cavitray for Common OpeningsWhere walls are curved the Cavitray is supplied tomatch the arc created by the lintel. Where the

curve is very slight and the opening width is notextensive, straight lintels can be considered. In suchinstances a straight cavitray can be used withwidened ends to provide full DPC coverage wherethe straight lintel line strikes the masonry arc. Seepages relating to Type C Cavitray.

Type P Cavitray for Curved ParapetsFunctionality of the Type P curved parapet tray isunaffected by concave or convex masonry and isable to cope with the concentrations of water washprevalent in concave situations where wind andgravitation accentuate localised volumes. Athigher level the under-coping DPC requiressupport and consideration should be given tousing bespoke Type J Support Closers.See pages relating to Type P and Type J.

data• Damp-proof trays and flashing in one unit• Ready to use module Cavitrays on bespoke basis• Cavity width adjustment ensures compatibility• Integral stopend and water-check• Permits easy regulation compliance


DAMP-PROOFING 41

Type X Cavitray for Curved Gable AbutmentsWhere a pitched roof abuts a curved wall, theangle of the roof may remain constant but theactual angle of intersection differs on everycourse, depending at which point it meets thecurved wall. In the example shown the size ofevery tray is different. The protective arrangementcommences with a catchment tray followed bydifferently sized intermediate trays and finisheswith a horizontal ridge tray. Each flashing isproportioned to suit the course encountered.Instances where a pronounced curve might inhibiteasy handling, lifting and dressing of attachedflashings, the flashings are supplied separately.See pages relating to Type X Cavitray.

Type Q Cavitray for Curved Walls requiringArresting BarriersCurved Type Q trays eliminate the requirement toprovide support from the inside skin. In contrastthe use of roll DPC requires support and sufferssurplus puckering within the cavity in concave

situations and material stretching in convexapplications. The curved Type Q can maintain aconsistent base and cavity presence. See pagesrelating to Type Q Cavitray.

Type G Cavitray for Curved HorizontalIntersectionsModified versions of the Type G Cavitray provideprotection where horizontal intersections andcurved cavity walls meet. The base dimension iscommonly widened where the arc and use ofrectangular blocks results in the cavity beingslightly impinged where ends of blocks meet. See pages relating to Type G Cavitray.

Despite the angle of the abutting roof being constant, theangle of intersection differs on every course, depending atwhich point it meets the curved wall.

42 DAMP-PROOFING


Type Y Mullion WindowCavitraysusePreformed trays for use with mullion windowsurrounds and similar.

solutionMullion window assemblies manufactured fromsynthetic or real stone generally require a total ofthree cavitrays to maintain damp course integrityacross the window head. Type Y stone mullionassembly cavitrays are preformed and eachrequires building into one skin only. An upper trayarrests the flow of penetrating water preventingthe flow reaching the label-mould where a secondtray offers protection where the cavity width isrestricted. A third tray with optional insulationisolates connection between inner and outer skins.

data• Preformed and packed per opening• Consistent build quality detail• Will not sag, distort or creep• Black solid polypropylene• Dimensioned to suit specific site details

Type Z Fixing Strap forSoft DPCs.usePreformed fixing aid for use with polymer,bitumen and polythene roll DPC.

solutionCavistrap is supplied predrilled for immediatefixing. It may be employed to support and retainsoft and flexible DPCs to the inner leaf, asrecommended by the DPC manufacturers. The cavistrap is not flat but purposely slightlyarched to promote effective securing pressurewhen fixed, despite irregularities of the inner skinsurface. Use of the cavistrap provides an easyand cost effective way of establishing definedand consistent fixing against all types of innerskin such as block, cast concrete and timber.

data• PVCU in black• Size 2000mm x 30mm• Pre-drilled 4mm holes @ 150mm centres• Packed in 50s (total 100 metres)• Cost effective method to mechanically

secure flexible DPC

Cavistrap is predrilled forimmediate use

ClosersThermal Acoustic & Fire-Rated Closers Vertical & Horizontal Applications

IMPORTANTEvery building must be designed and constructed in such a way that an insulation envelope isprovided that reduces heat loss. 6.2 BR(S) – mandatory

How to select a Closer and comply with Part LCompliant progression entails matching ACD’s(RD/NHBC). Alternatively simply select the mostappropriate closer from our range to suit yourproposed construction. Ensure all adjacentelements are in accordance with Best Practice.

Compliant Thermal Performance at Junctions isachieved by installing a cavity closeroverlapping the frame a minimum of 30mmhaving a minimum thermal resistance paththrough the closer of not less than 0.45m²K/W(manufacturer’s certified data).

Adherence to the above qualifies the builder toclaim the (default) value given in IP 1/06 Table3 and SAP 2005 Table K1.

As qualified within BRE Report 262 – AccreditedConstruction Details for BRE Part L (Conservationof Fuel and Power).

Information regarding the Minimum ThermalResistance Path (MTRP), frame positioning (set-back), and values may be found in BREReport 262 and the BRE publication Assessingthe effects of Thermal Bridging and Junctionsand Around Openings.

Introducing...Cavity Wall Closers

Cavity closers and stops are designed to enhance the thermaland environmental performance of the structure.This section lists efficient ways in which cavitywalls may be closed, Building Regulations,thermal, fire and acoustic requirements, plusthe arrestment and isolation of permeatingdamp, are addressed using our constructionsolutions.

The specifier may select from a wide range ofoptions. Some closers address the sameconstruction detail, but with a differentemphasis. The choice may be refined pendingthe desired thermal, fire integrity or acousticlevel sought. Choice also extends with theprovision for expansion and contractionbetween timber and masonry skins.

If you cannot see what you want or have abespoke requirement, please contact us.

To contact us, use the email address or any ofthe other options listed. We look forward tobeing of service to you and supplying costeffective best practice solutions to protectyour projects.

Hygrothermal Behaviour Products for use in Accredited ConstructionDetails (version 1.0) and Robust Details forjambs and sills that require a path of minimumthermal resistance through the closer of 0.45Wm–2K–1.

Weather Resistance Products act as an effective damp-proof barrierand resist the passage of water towards theinner skin when used in a suitable cavity wallconstruction.

Structural Stability Passive functionality in terms of wind-loadingresistance permits use of products within allareas of the UK.

DurabilityCorrectly incorporated within cavity wallconstruction, products are designed to last thenormal expected life of a building.

PerformanceIn accordance with Building Regulationsrequiring a minimum thermal resistance path.

[email protected]


CLOSERS 45

Acoustic Stops andThermal BarriersuseSleeved compressible stops and barriers to inhibitnoise transmission and improve the thermalperformance.

solutionAcoustic Stops and Thermal Barriers areavailable in a wide range of sleeved sizes forintroduction into cavities, thresholds, lintelarrangements etc. Applications at ground levelcan provide a minimum R-value of 0.75m²K/W.

When used as an insertion between lintels that areindependent of each other over a cavity wallopening, the arrangement can minimise coldbridging at the window head to an extent notpossible with combined lintels. Lintel infillencapsulations are shaped to fully fill the angledvoid for the full cavity width under the Cavitray void.

At level thresholds an Acoustic and ThermalBarrier may be introduced between skins toenhance the thermal integrity twixt Type LTT traysto the inner and outer masonry skins.

Encapsulations will not support vermin and arechemically inert. Select sleeve size that is 15-20mm wider than cavity size to facilitate correctfriction fit. Bespoke service also operates.

Bespoke Traditional Closing ServicesolutionWhere construction or reconstruction of aproperty is required to replicate a traditionalstyle, the opportunity exists to eliminateshortcomings or areas in which the dampproofing and thermal qualities are not ideal. It isusually possible to introduce measures that donot affect the aesthetics of the structure but doraise the performance and improve thebehaviour of the wall.

Openings in new and existing buildings can beassessed and preformed closing DPC’s mouldedto aid consistent and accurate construction. At thesame time thermal benefits can be introducedwhere possible.

Both architect and contractor are able to makeuse of preformed solutions that create the desireddetail, thus eliminating problems commonlyassociated with installer error and misplacement.

To take advantage of the Bespoke TraditionalClosing Service, please contact your AreaManager or the Helpdesk at our Yeovil office.(See back for contact numbers).

46 CLOSERS


Continuity ClosersolutionThe faceplate of the Continuity Closer spans bothmasonry skins and provides a rigid finish for revealfinishing of plasterboard on dabs or similar. Theinsulating core is stepped to close the reveal andinterface with the adjacent partial fill cavityinsulation. In so doing the Continuity Closer masksthe thermal spiking path that should not exist butcommonly does in both first fix and second fix closerapplications.

With the heat loss path obscured, the constructionneed not default outside the Building Regulationsapproved document L1A 5.9 that states there shallbe no reasonably avoidable thermal bridgescaused by gaps.

data• Blocks heat loss path• Eliminates thermal spiking• Acts as vertical DPC• First and second fix applications• To suit 100, 110, 120 & 130mm cavities

Type D Damp Course(Vertical)useInsulated pre-shaped vertical DPC for use whenclosing cavity walls in the original manner.

solutionIn buildings constructed of cavity walls, wheneverthere is a window or door opening it is necessary toclose the cavity. The traditional manner involvedturning the internal skin through 90 degrees andincorporating a DPC to prevent actual physicalconnection with the damp mortar and masonry ofthe outside skin. A flexible vertical DPC can be easilydamaged or misplaced, The Type D DPC overcomessuch problems and speeds up operations on site.The Type D is insulated and automatically introducesa thermal break within the reveal. The Type D offersflexibility and self-supporting rigidity, whilstprotecting the masonry return completely.

data• Stabilised DPC polypropylene, 1.5mm• Expanded polystyrene to BS 3837/1986.• Standard 2400mm lengths• Profile illustrated suits standard brickwork

and blockwork of up to 110mm thickness• Other profiles available for all sizes• Preformed DPC available in many profiles• Very severe rating with checked reveal using

formatted version


CLOSERS 47

Type DIPuseThe Type DIP is an extended version of the TypeD and permits traditional closing of the revealplus interfacing with the cavity insulation. Theresultant continuity ensures thermal integrity ateach structural opening is optimised.

solutionThe Type DIP (Type D in Interfacing Profile) is usedwhere the mason is returning block work at thereveal in the traditional manner, and slab insulationis present within the cavity.

The Type DIP is manufactured of solid dpc to whichis bonded insulation. The dpc profile extendssufficiently into the cavity to permit this insulation tooverlay the cavity slab insulation and maximise thethermal arrangement whenever inner and outerskins meet. Different profiles are available for bothstraight and checked applications to suit structuralrequirements.

data• Stabilised dpc pethylene• Expanded 50mm polystyrene to BS 3837/1986• Ready-shaped for consistent build quality• 2400mm lengths• Sizes to suit customers build requirement• Severe and very severe exposure rating

pending profile

Eliminatesthermal spikingthat exists if thecavity slabinsulation hasan irregular orinconsistentpresencewhere it is cutinto the blockwork return.

Type FWC Five Width CavicloseruseCloses cavity walls, insulates reveal and acts as aDPC.

solutionFWC stands for Five Width Cavicloser, being thenumber of different cavity widths accomodatedby this versatile closer. The insulating medium ischannelled to permit trimming to the cavity widthdesired.

The Type FWC promotes full-fill reveal closing offive different cavity widths: 50mm, 65mm, 75mm,85mm, 100mm. Thus this one model is usuallysufficient for a contractor tackling the popularcommon cavity wall configurations.

data• Suits cavities of 50mm, 65mm, 75mm, 85mm,

and 100mm• Packs of 10 lengths x 2.4 metres• Closes, insulates, acts as DPC• New and existing work applications• Trimmed to suit on site• Severe weather rating with 30mm set back

48 CLOSERS


Type H CavicloseruseThe Type H cavicloser is the first specificallydesigned universal cavicloser. It permits openingsin cavity walls to be quickly closed in a uniform,standardised manner.

solutionThe labour intensive necessity of cutting blocks andreturning the masonry to form the reveal iseliminated. The Type H cavicloser is an insulated,structurally enveloped member, which literally fillsthe gap to form the cavity wall reveal. At the sametime, the Type H insulates the reveal, minimising coldbridging. The vertical DPC requirement is created atthe same time. The Type H cavicloser is universal asits unique two-part design permits permutations toaccommodate different sized cavities and differentframe positions. The Type H benefits the contractorin terms of speed, regulation compliance, versatilityand quality of build. Being universal means moststyles of openings can be closed using the standardsized cavicloser. Building costs are reduced.

data• H2 for cavity widths of 75mm & 100mm• Permits varying frame positions• Insulates and introduces a thermal zone• Acts as a DPC• Severe weather rating with 30mm set back• Very severe rating with checked reveal using

formatted version

QuickcloseruseCloses the reveal, insulates and acts as a DPC.

solution The Quickcloser provides an alternative methodof closing cavity wall reveals in new-buildconstruction. It may also be employed toregularise open reveals or reveals uncoveredduring refurbishment and improvement works.The insulating medium is flexible, and containedwithin a sleeve that can be squeezed to shape tofill the cavity snugly, eliminating voids. At the sametime the Quickcloser acts as a DPC, eliminatingthe need for a conventional vertical damp course.This closer utilises full-fill cavity insulation in asleeve that is worked to optimum shape by theinstaller whilst raising the cavity wall.

data• Nominal 120mm x 45mm x 2.1 or 2.4 metres• Packed in10s with accompanying ties• White PVCU and polythene

Polypropylene ties• Siliconised RDT semi-rigid water-proof

insulating glass• Closes the reveal and acts as DPC• Insulates cavities from 40mm up to 100mm• New and existing structure applications• Severe weather rating with 30mm set back

This updated Quickcloser also supersedes Type O and Type RCClosers and may be used to address existing structure applications


CLOSERS 49

Sash Frame Insulated DPCuseSash Frame Insulated DPC’s are specificallymanufactured for use with sash window frames.

solutionDPC integrity is introduced along the line of themasonry check and cavity, promoting thermalenhancement of the reveal. Sash Frame DPC’sare available for both traditional counterweightbox style and balance style frames. The specifieris able to select the extent of thermalenhancement to suit the frame and structuralopening dimensions. In the case of a balancedsash frame replacing a counterweight sashframe, the opportunity also exists to fully insulatethe resultant void. Modified versions areavailable for use in solid wall construction whereenvelopment of the frame is desired to isolateagainst permeating damp.

data• BS polypropylene, colour black Inskorfoam

polystyrene insulator• Size 2400mm x dimensions to suit window/wall

detail• Various profiles to suit site requirements.• Straight or checked reveals• Permits traditional closing with enhanced

thermal integrity

Type WCAuseInsulated closer for wide cavity applications.

solutionWCA stands for wide cavity applications for whichthis closer is specifically designed.

This product is available in width increments tosuit cavities from 100mm wide up to 150mm wide.The heavy-duty body overlays the inner and outerskins, permitting the installer unrestricted framepositions within compliant parameters. Theinsulating core is polystyrene. The Type WCA is thethermally efficient preformed solution for unusualcavity widths and applications.

data• Closes cavities up to 150mm wide• Insulates reveal• Acts as a vertical DPC• Permits choice of frame positions• Available in lengths of 2.1m and 3.0m• Severe weather rating with 30mm set back• Very severe rating with checked reveal using

formatted version

50 CLOSERS


Type V CavicloseruseCloses cavity walls. Insulates reveal and acts as a DPC.

solutionThe new Type V Contract Closer provides aneconomical way of closing cavity wall reveals.Manufactured from PVCU, the Type V is a one partcloser consisting of a ribbed face section whichspans the open cavity and overlays the inner andouter skins of masonry. Secured behind this face is aclosed cell insulating core, which is accommodatedwithin the cavity. Integral slots to both sides of thecapillary-break V shaped core housing, accept tiesand secure the closer to the masonry skins. The newType V Contract Closer permits frames to be fitted inany position within the depth of the reveal.

data• Material, PVCU, white• Standard lengths: 2.1 metres, 3 metres• Insulating core: Closed cell polystyrene• Combined closer, DPC and insulation• Positive securing ties• Severe weather rating with 30mm set back• Very severe rating with checked reveal using

formatted version• Suits cavities 50mm, 75mm & 100mm

Type V Large nowavailable to suit cavitiesup to 170mm

Type WCA Maxi RangesolutionWide cavity widths up to 330mm are addressedusing caviclosers from the Type WCA Maxi range.

All models have enlarged multi-layered insulatingcores promoting robustness and thermal contactresistance. The foam core is over layered with areflective foil, with a finishing face of heavy dutylow conductivity Petheleyne.

Suitable for use in straight reveal. Adaptedversion available for checked reveal. The closersides are independent of each other being frictionlinked via the insulating core This arrangement ismore accommodating of movement betweenskins given rotational predisposition increases thewider a cavity becomes.

data• Suits cavities from 150mm to 330mm• Acts as DPC• Acts as Insulator• Differential movement provision


CLOSERS 51

Cavi120 Type V Closer(Fire rated designation)useFire-rated closer with 120 minutes integrity rating.

solutionThe Type V cavicloser with a Cavi120 prefixidentifies it as having a one hundred and twentyminute fire integrity rating. For general detailsrelating to the Type V versatility, please seeprevious pages. This vertical fire integrity closerhas been tested in cavities up to 100mm wide.

data• See previous Type V entry for general use

details• Cavi120 Type V is available to suit cavities of

50mm, 55mm, 60mm, 65mm, 70mm, 75mm,80mm, 85mm, 90mm, 95mm, 100mm

• PVCU compound• Stainless steel ties• Non-combustible semi-rigid rock mineral

wool insulation• Insulates and acts as DPC• Closes cavity with fire rated product• Use in traditional construction• 120 minutes fire integrity rating• Available in 2.1 and 3.0m lengths• Severe weather rating with 30mm set back

Type V170 Eight Width CaviclosersolutionBased on the Type V design this model is for usein cavities from 100mm to 170mm. The Type V170 is a one-part closer with a faceplatefeaturing anti-capillary fins and a frame-interfacing flexible gasket.

The faceplate overlays inner and outer skinsbetween which the insulation core is retainedwithin an integral securing jaw with sidemoulded apertures that receive the securing tiesfrom both skins. The faceplate and gasket permita choice of frame positions within compliantparameters making this a versatile contractcloser for use in wider cavities.

data• Cavity range 100mm to 170mm• Acts as a vertical DPC• Closes and insulates reveal• Cost-effective contract closer for wide cavities• Trim insulation to desired cavity width

170160

150

140

130120

110100

40

10

52 CLOSERS


Cavi60 Type WCA (Fire rated designation)useInsulated cavicloser for cavities from 100mm up to150mm wide. Offers fire integrity rated protection.Acts as a vertical DPC. Promotes insulation of reveal.

solutionThe Cavi 60 Type WCA is prefixed with Cavi 60as it provided 60 minutes fire integrity whentested to the appropriate British Standard. WCAis the abbreviation for Wide Cavity Applications.This closer is available to order to suit cavitywidths from 100mm up to 150mm maximum. Thenon-combustible semi-rigid rock mineral woolinsulator is held within a robust heavy-dutyextrusion. The designer has an unrestrictedchoice of frame positions within the constraintsof thermally efficient options. Stainless steel tiesaccompany the Cavi 60 Type WCA.

data• Available to suit cavity widths of 100mm up

to 150mm• Available in lengths of 2.1m and 3.0m• Rock wool insulating core• PVCU surround• 60 minutes fire integrity rating• Stainless steel securing ties• Severe weather rating with 30mm set back• Very severe rating with checked reveal using

formatted version

Cavi60 Type V170Contract CavicheckCloseruseFire-rated closer for wider cavities with 60minutes integrity rating. For use in straight orchecked reveals.

solutionThis cavicloser may be used in cavity walls with acavity of up to 170mm. The extruded profile is alarger and more robust version of our originalType V. The flat reveal closing section has integralfins that permit a variety of frame positions withincompliant parameters whilst also promoting bestpractice. Vertical and horizontal use.

data• Size approx 200mm x 60mm x 2.1m or 3m• Available to suit cavities from 100mm to

170mm• Cavi 60 rating vertically & horizontally• Acts as vertical dpc• Insulates reveal closing• Integral fins• Permits variable frame positions• Straight or checked reveals - front hinge-turns

90 degrees• Severe weather rating with 30mm set back


CLOSERS 53

Cavi240 PWIB/SAFVertical Cavity Barrier solutionThis vertical dual-function barrier is for use whereseparating walls (party walls) join exterior cavitywalls. The barrier introduces a four hour ratedfire integrity level and acoustic cushioning asdemanded by legislation. The ends of the Cavi240 Type SAF Vertical Barrier are angled so thateach vertical length wedges into and against thevertical length under it, promoting continuity.Water cannot permeate inwardly because alljoins are made sloping forward towards the outerleaf (as with the horizontal SAF barrier).

Vertical barriers are enveloped within apolythene sleeve sufficiently robust to act as aDPC, as defined by NHBC / Building Regulations.In applications where a rigid DPC presence isalso required, the barrier is available with a semi-rigid polypropylene DPC bonded to one side.(This product supersedes the Cavi 240 Type PWIB).

data• Acoustic Barrier• Fire Barrier – 4 hours rating• Sizes to suit all cavity & wall dimensions• Easy linking and continuity• Standard vertical lengths 1200mm• Corners 2400mm long

Cavi60 SAF HorizontalBarrier / StopsolutionThis compressible acoustic and fire cavity barrierhas sloping upper and lower surfaces thatensure penetrating water is deflected forward.Considered the most cost-effective way ofestablishing all three qualities within the cavitywall. Sloping shape means integrity can bemaintained whenever lengths are lapped.

Optional hard cap DPC cavitray ensuresmaximum protection. The compliant orientedshape is simply compressed and positioned intocured masonry. Placement can be without tray ifappropriate (such as shown in some RobustDetails) Alternatively an optional cavitray capsover the upper sloping surface.

Compatible with Type SAF Vertical Barrier,permitting damp protection, fire-stopping andacoustic integrity to be maintained at horizontaland vertical intersections.

data• Acoustic barrier• Fire barrier• Protective shape prevents water tracking• Easy linking and lapping• 1 hour rating

54 CLOSERS


Cavi240 Type CFISCavicheck Fire IntegrityStopuseCompressible fire stops for use horizontally incavity walls.

solutionCavicheck Fire Integrity Stops are manufacturedfrom rock mineral wool that has a non-combustible classification.

The wool is enveloped within a polythene sleeve.Compressing and placing within the cavity securesthe Type CFIS in position.

A minimum compression of 10mm is necessary tofriction fit the stop and importantly provides afunctional relationship between surfaces. The use of an Arresting Barrier or Type CD CavityDropcloak is appropriate to introduce DPCmeasures in accordance with best practice.

data• Standard size 100mm x 50mm• For use in cavities up to 100mm• Rock mineral wool, non-combustible

classification (BS 476) within polythene• 240 minutes fire integrity rating• Easy friction fit and support from wall ties

Cavi60 MWR 200Cavicheck Fire IntegrityStopuseCompressible fire stop for use in cavity wallswhere the cavity width is up to 200mm wide.

solutionThe Cavi 60 prefix signifies a sixty-minute fireintegrity rating for this maximum width range(MWR) cavicloser that may be used in cavities ofup to 200mm. For horizontal and vertical use.

Comprising of non-combustible classificationrock mineral insulation contained within apolythene sleeve, this cavicloser also reducesacoustic interference when employed within acavity wall. Horizontal protection cavitraycompatible.

data• Standard size approx 200mm x 100mm x 2.4m• For use in cavities from 100mm up to 200mm• Rock mineral insulation, non-combustible• Cavi 60 rating, vertically & horizontally• Easy compression friction fit

Shown here without cavitray.

Shown here without cavitray.

VentilationVentilation of the Building Envelope

IMPORTANTEvery building must be designed and constructed in such a way that ventilation is provided so thatthe air quality inside the building is not a threat to the building or the health of the occupants 3.14BR(S) – mandatory.

Ventilation products are divided into five sections, with eachsection dealing with a specific area of construction.• Ventilation at Floor Level • Ventilation Through Walls• Ventilation at Eaves & Fascia Level • Ventilation via the Soffit• Ventilation Where Roofs Abut Walls + Through the Roof

The designer has a choice of ways of providingventilation for each area, and may select fromeach category the most appropriate in terms ofperformance and visual presence. Someproducts appear in more than one category.

Ventilators provide airflow in and out of thebuilding envelope and permit specified rooms,areas and voids to breathe. They are alsonecessary to evacuate contaminated land gasesout of a structure where gas arrestment barriersare present. Options for providing ventilationwhere a flat roof extension is added to an existingbuilding include provision at the attachment pointand corresponding ventilation opposite.

The NHBC advises properties less than twoyears did not cope with the migration of water

vapour from roof space to outside during frostand snow conditions last winter, where moistureevacuation from the roof space relied onpermeable membranes only. The NHBC refersto BS 5250 and its guidance regarding usingventilators to provide adequate airflow levels.NHBC 2011 Standards 7.2- D11 and S11nowincorporate this requirement. It should be notedthat the NHBC has announced that when itintroduces a standard for this particularpurpose, it will take precedence over third partyassessments of underlays - eg. BBA certificates.

Our options to service roof void ventilationhave been increased to address those situationswhere vapour permeable roofing underlayscannot provide the requisite levels offunctionality.

56 VENTILATION AT FLOOR LEVEL


1 Cavibrick

2 Cavibrick Sleeves

3 Cavibrick Sleeves

4 Sleeve & Duct Cavitrays

5 Type TAV

6 Type TAV Sleeves

7 Type TAV to Round Connector

Ventilation at Floor Level

Cavibrick HighPerformance Air-brickuseThe cavibrick is a high performance ventilatorwhich may be used instead of a conventional air-brick.

solution Manufactured to brick dimensions, the cavibrickpromotes a high air throughput, via a frontlouvred grille. The louvres are proportioned tomaximise performance whilst contouring the airto challenge through-draughts. The louvres arealso spaced to comply with the latest BSrequirements but have been staggered to offeralso an insect resistant screen which is not offeredon some standard airbricks.

The cavibrick incorporates a water dam back toprevent rain penetration and crossflow separators.Moulded in a range of colours, the cavibrick maybe used singularly, or in multiples. The cavibrick isfully compatible with our range of telescopic andstraight sleeves.

data• High air throughput• Insect screening• Self-draining base• Clip together to make up composite sizes• Range of colours


VENTILATION AT FLOOR LEVEL 57

Cavibrick SleevesuseSleeve attachments to provide ventilation tospecific areas.

solution A range of straight sleeves to accommodate one,two or three cavibricks. (High throughputcavibricks are designed to be used singularly orcan be locked together to form larger brick-sizedventilating units.)

When connected to a cavibrick the combinedlength is sufficient to accommodate all popularcavity wall widths.

We recommend sleeves are protected with acavitray where they pass through the cavity, tocomply with NHBC/best practice. (See Sleeveand Duct Cavitrays.)

data• Range of sizes• Compatible with Cavibrick• Fold flat storage• Unobstructed airflow

Cavibrick to RoundConverter SleeveusePermits cavibrick to be connected to standardpipe.

solution Where it is proposed to provide ventilation toa remote room, under floor area or void, arectangular to round converter sleeve isavailable to permit the use of standard100mm nominal plastic soil pipe.


data• Compatible with Cavibrick• Fits standard pipe• Unobstructed airflow

2 brick sleeve 1150mm x 300mm



1 brick to round converter



Sleeve & Duct CavitraysusePreformed trays to protect sleeves and ductswhere they pass through a cavity wall.

solution Where a straight or cranked sleeve/duct passesthrough a cavity, measures should be taken toensure penetrating water cannot use the uppersurface of the sleeve/duct as a means to reach theinside skin. Use of a preformed cavitray preventswater bridging and promotes compliance of theBuilding Regulations.

data• Suits range of cavity sizes• Compatible with all sleeves• Prevents tracking

Type TAV TelescopicAdjustable VentilatoruseProvides cranked air-duct route from cavibrick toarea at different level.

solution The Telescopic Adjustable Ventilator extends orcontracts like a telescope. It extends to amaximum of five brick courses.

It is designed to accommodate the highperformance cavibrick, or may alternatively beused with a conventional air-brick. Airflow can bedirected to a specific area of the structure, at adifferent level. Where a greater variation isrequired beyond five courses, an intermediatesleeve is available to extend the range.

The Type TAV offers an unobstructed airflow routeto promote best practice. An accompanying DPCcavitray is also available to order, to providedamp proofing integrity as defined within theBuilding Regulations.

data• Unobstructed airflow route• Extends and retracts to suit course level• Accommodates high performance cavibrick• Accompanying cavitray• Horizontal and vertical extension sleeves


VENTILATION AT FLOOR LEVEL 59

TAV SleevesuseTo extend the Type TAV cranked sleeve to createa greater distance between inlet and area to beserviced.

solution Where the distance between air inlet and outlet isgreater than 375mm, vertical extension sleevesmay be fitted. Similarly horizontal extensionsleeves are available for use where a long reachis required and space prevents the use of 100mmnominal pipe connected using a Type TAV toRound Converter.

data• Extends ventilation options• Clear-flow air way• Fits within 50mm cavity• Standard sizes 300mm and 450mm

Type TAV to RoundConverter SleeveuseTo permit attachment of circular pipe to bottomoutlet of Type TAV telescopic ventilator.

solution Where a plastic nominal 100mm pipe is used tocarry airflow to specific parts of a structure, ameans of connection to our cranked telescopicventilator is required.

The TAV to Round Connector is designed for suchpurposes. This attachment can be successfullyused to provide piped exit routes for radon gas(below floor level) to the perimeter of a buildingwhere discharge is via cranked ventilatorsbecause of the exterior ground levels.

data• Compatible with TAV• Fits standard pipe• Unobstructed airflow



Type CLV CircularLouvered VentilatoruseLouvered ventilator that can be used to ventilatean existing cavity wall.

solutionThe Type CLV is popular in after-fit drill and ventapplications. It can be introduced when the wettrades have finished. It differs from most circularventilators as it has an airflow aperture rating of2100mm². The installer is required to drill fewerholes around the building, as fewer ventilators arerequired to provide the requisite levels ofventilation.

Example: if a small circular vent has a free area of300mm, it would require seven such ventilators toequal the free area of one Type CLV. The Type CLVis commonly installed at 1.2m centres to fulfilventilation requirements in typical applicationsand is offered in a range of masonry harmonisingcolours: terracotta, black, white beige and brown.Projecting location grips hold the Type CLV inplace when inserted into the drilled hole.

data• Louvers deflect driving rain and provide

insect screening• Integral location grips• Higher air throughput


VENTILATION THROUGH WALLS 61

1 Cavibrick

2 Cavibrick Sleeves

3 Type W

4 Euroweep-Vent

5 Ventilation Packs

Ventilation Through Walls

Cavibrick HighPerformance Air-brickuseThe cavibrick is a high performance ventilatorwhich may be used instead of a conventional air-brick.

solution Manufactured to brick dimensions, the cavibrickpromotes a high air throughput, via a frontlouvred grille. The louvres are proportioned tomaximise performance whilst contouring the airto challenge through-draughts. The louvres arealso spaced to comply with the latest BSrequirements but have been staggered to offeralso an insect resistant screen which is not offeredon some standard airbricks.

The cavibrick incorporates a water dam back toprevent rain penetration and crossflowseparators. Moulded in a range of colours, thecavibrick may be used singularly, or in multiples.The cavibrick is fully compatible with our rangeof telescopic and straight sleeves.

data• High air throughput• Insect screening• Self-draining base• Clip together to make up composite sizes• Range of colours

62 VENTILATION THROUGH WALLS


Cavibrick SleevesuseSleeve attachments to provide ventilation tospecific areas.

solution A range of straight sleeves to accommodate one,two or three cavibricks. (High throughputcavibricks are designed to be used singularly orcan be locked together to form larger brick-sizedventilating units.)

When connected to a cavibrick the combinedlength is sufficient to accommodate all popularcavity wall widths.


data• Range of sizes• Compatible with Cavibrick• Fold flat storage• Unobstructed airflow

Type W Cavity PerpWeep/VentilatoruseDual-function product acts as a cavity ventilatorpermitting the cavity to breathe. Also acts as aweep to evacuate water from lintels, DPCs andcavity trays.

solution The Type W may be used to provide the balancedair conditions demanded within the cavity intimber-frame construction. The equivalent airflowof an open perp is required every 1.5 metresaround the base of the cavity walls and around thetop of the same walls. Where such wall cavities areclosed or compartmented with the presence ofhorizontal fire stops or similar, ventilation aperturesare required below and above such stops.

Type W cavivents are designed for suchpurposes. Type W cavivents are available in arange of colours to blend with the adjacentmortar or masonry.

data• Dual-function combined weep and ventilator• Insect resistant grille• Integral water-check baffles• Superior air throughput and water discharge

capability• Optional render protection cover, keeps grille

clean during installation





VENTILATION THROUGH WALLS 63

Euroweep-Vent(Alternative to Type W)useThe purpose and function of the perp weep/ventilator is described on the previous pages(Type W).

An alternative product is now available offeringsmaller overall dimensions but with highperformance categorisation.

solution Euroweep-vents are positioned within the perpjoints between masonry. Their function is twofold.They act as a weep to discharge water fromDPCs, cavity trays and lintels.

They also act as ventilators to encourage thecavity to breathe. Euroweep-vents weredeveloped and are now extensively used on thecontinent. They can also satisfy UK, N.H.B.C. andBuilding Regulation requirements. Compact sizedoes not compromise the performance of theEuroweep-vent which promotes excellent freeairflow and discharge behaviour.

data• Dual-function weep and ventilator• Integral baffle• Vertical front• Reduced size without bottleneck exit route

Ventilation PacksuseProvide ventilation to habitable rooms. Also airventilation for areas in which boilers are enclosed.

solution EA total of three packs, each of which consists ofa cavibrick(s), a sleeve, an interior grille and aprotective DPC cavitray. Ideal for new constructionand refurbishment work.

data• Three airflow levels• Complete ventilation packages• Accompanying protective cavitray• Easy stock control and selection

300mm

300mm

300mm

225mm

150mm

75mm

64 VENTILATION AT EAVES & FASCIA LEVEL


1 CSV

2 Type CRSV

3 Type CV

4 Type EROV 400

5 Type OEVWF

6 Type OFV-10

7 Type OFV-25

8 Type PV

9 Type T

10 Type T Long Channel

11 Three-in-one

12 Type Rev

13 Type ECF

Ventilation at Eaves &Fascia Level

Type CSV Circular Soffit VentilatoruseCircular Soffit Ventilators with louvres, for newand existing work. Ventilators promote the entryof air into the roof space.

solution The upgraded CSV Circular Soffit Ventilator maybe introduced into new soffits or existing soffits. Itpermits easy and quick upgrading of existingstructures.

The unique injection moulded ventilator has adeflecting louvred face, promoting positive airentry and insect screening. Unlike standardventilators, the unique CSV may be rotated sothat the louvres slope downwards towards themasonry face. In so doing, no visibleapertures/grilles are apparent to the eye and theresult is of a continuous unpenetrated soffit, whena CSV of a matching colour is fitted.

data• Superior airflow 2,100m2

• New and existing work applications• Rotate for visual or non-visual appearance• Insect screening• Easy regulation compliance• Available in White, Black, Brown, Beige &

Terracotta


VENTILATION AT EAVES & FASCIA LEVEL 65

Type CV CorbelVentilatoruseTo provide air ventilation at eaves level, where arunning masonry corbel is constructed.

solution The Type CV Corbel Ventilator is designed to beincorporated above a running masonry corbelbuilt of brick, stone or similar.

The ventilator has a slotted vertical front face,providing the equivalent of a 10mm continuousair opening. To the rear of the ventilator, the basehas a dovetail anchoring slot which permits thesecuring ties to be positively attached at anyposition to suit the corbel masonry joints.

data• Suitable for roofs of 15 degrees upwards• Free airflow 10,000mm2 per metre• Integral insect screen• Adjustable anchoring ties• Compatible with our range of eaves ventilators• Available in Black & White

Type CRSV CircularRecessed Soffit VentilatoruseTo provide airflow in and out of roof space via thesoffit board. Suitable for introduction into existingsoffit boards to fulfil airflow requirements. Alsosuitable for new build applications.

solution The CSRV differs from the standard CSV as it hasa deep body that protrudes up into the soffit box.The airflow apertures are positioned around thesides of the deep body ventilator rather thanthrough the top.

This arrangement results in a far greater airflowrating per ventilator. Thus a lesser number arerequired to fulfil the statutory airflow levels.

data• High airflow• Reduces number of soffit apertures• Insect screening• New and existing work applications

Type CV under tile edge adjacentto eaves vent



Type EROV400 Eaves Roll-out VentilatorusePermits entry of air via eaves.

solution The eaves roll-out ventilator is manufactured inPVCU. The cross corrugations permit this productto be supplied in long rolls which are thenuncoiled on site across the trusses in theappropriate position. Nails are then used tosecure the roll in position.

The result is an evenly spaced air route along theeaves, providing ventilation in accordance withthe Building Regulation requirements.

data• New and existing work applications• Maximum free airflow 30,000mm2 per metre• Suitable for all popular truss centres• Easy regulation compliance

Type OEVWF Open EavesVentilator with FlyscreenusePermits entry of air into the roof space via eaves.

solution Preformed ventilator with flyscreen. For usebetween open eaves, without soffits. Providesventilation route into the roof space. The OEVWF isdesigned for use with open eaves details.(Cottage-style open-timber detail, with stand-offfacia but no infilling soffit board.)

The open eaves ventilator is suitable for use innew-build or re-roofing projects. When located inposition, the flyscreen permits air entry whilstpromoting insect-resistant status.

data• For open-eaves and non-fascia applications• Integral fly screening• All roof pitches accommodated• Easy regulation compliance• 10,000mm2 rating

The ventilator is unrolled evenly across the trusses to createa regular ventilation pattern in the appropriate position, toprovide up to 6 metres run.

435mm 600mm

Dimensions of OEVWF/600



Type OFV-10 Over Facia VentilatoruseEntry/exit route for air into the roof space via thefascia top.

solution The Type OFV-10 Over Fascia Ventilator issuitable for use on new and refurbishment work.This ventilator can be used in no-soffit situationsas well as where the soffit is in place as theventilator locates and fixes to the top of the fascia.Integral insect screening and fixing holes.

data• Hidden ventilation at top of fascia• All roof pitches accommodated• Integral insect screening• Reduces fascia size and cost• 12,500mm2 per metre rating• Available in Black & White

Type OFV-25 Over Facia VentilatoruseAlternative entry route for airflow servicing theroof space.

solution The Type OFV-25 is shaped to permit easy fixing tothe top of the fascia board. It has an airflow ratingof 25,000mm2 per metre, making it suitable for usewith roof pitches of 15 degrees and below.

data• Hidden ventilation at top of fascia• All roof pitches accommodated• Integral insect screening• Reduces fascia size and cost• Provides statutory airflow• Only available in Black

Over fascia ventilator OFV10, for roofs requiring theequivalent of a 10mm continuous gap. Suitable for roofpitches of 15 degrees upwards.

41mm

20mm 20mm

20m

m

55mm

32m

m

28mm

38m

m

20mm7mm

4mm

Over fascia ventilator OFV25, for roofs requiring theequivalent of a 25mm continuous gap. Suitable for roofpitches below 15 degrees.



Type PV Panel VentilatorusePermits air entry into the roof space via the eaves.

solution In pitched roof applications, the Type PV panelventilator fits between the roof trusses andmaintains a defined airflow path between theunderside of roofing felt and the roof insulation.

The function of the Type PV is to receive air thatenters and exists via a fascia or soffit ventilator.Air is channelled through the body of theventilator via apertures within the bottom and topupstand edges.

data• Suitable for roof pitches of 15 degrees upwards• Compatible with fascia and soffit ventilators• Easy-fit• Excellent free airflow

Type T Eaves VentilatorusePreformed eaves ventilator permits airflowrequirements into roof space.

solution The Type T ventilator is categorised as universal,as it may be used upon a variety of roof pitches,and a variety of truss centres. The Type T does notfit between truss rafters. Instead it clamps theindividual truss rafter and creates a free air voidon each side, which more than satisfies thestatutory airflow requirements.

data• Suits all truss centres• Suitable for all roof pitches• Rapid fixing• Compatible with our fascia and soffit ventilator• 15,000mm2 maximum @ 600mm centres

Panel Ventilatordimensions.

410mm 620mm



Type T LongchannelusePreformed eaves ventilator permits airflowrequirements into roof space in which a room hasbeen incorporated.

solution The long channel version of the Type T can beused to advantage where airflow is required toservice a vented attic with an insulated knee-wall.The house-wrap or rigid sheathing material on theattic side of the knee-wall insulation protects theinsulation from wind-washing and the longchannel has sufficient reach to ensure airflow isunhindered.

data• Suits all truss centres• Suitable for all roof pitches• Rapid fixing• Compatible with our fascia and soffit ventilator• 15,000mm2 maximum @ 600mm centres

Three-in-one RoofVentilation KitusePack providing over fascia ventilation, eavesventilation and felt support.

solution The three-in-one roof ventilation kit provides aneasy and economical way of satisfying regulationrequirements regarding roof ventilation. Each kitcontains sufficient products to cover a six metrerun. The contents of each kit are as follows: 1no. 6metre roll of eaves roll out ventilator (EROV). 4no.Contract hardedge lengths.

A six metre run of standard over fascia ventilator(OFV). Three-in-one roof ventilation kits may beused with tile and slate roofs. All pack products arealso available separately.

data• Packaged solution for regulation compliance• Suitable for roof pitches of 15 degrees upwards• Easy ordering and stock control• Integral insect screening• 12,500mm2 per running metre



Type REV RefurbishmentEaves VentilatorusePreformed eaves ventilator for introductionbetween rafters in existing roof spaces.

solution The refurbishment eaves ventilator fits betweenrafters and can be placed in position from withinthe attic space. The ventilator bottom portion restsunder the insulation.

The ventilator top hinged portion hinges to followthe roof line. Its simple shape allows air to travel toand from the roof void. Insulation is not permittedto close the gap between the truss rafters.

data• Black - checking of correct placement is easy• Large protected air pocket• High airflow 10,000mm2 per metre run• Compliance of ventilation regulations

Type ECF Eaves Comb FilleruseTo provide ventilating infill whilst preventing entryof birds under contoured roof finishes.

solution The eaves comb filler is manufactured frompolypropylene in one metre easy to handlelengths. The supple teeth of the comb flex toaccommodate the contours of the tile or sheet.

Such flexibility eliminates the need of purpose-made profiles to suit each style of roof finish. Thusthe ECF suits a very wide range of profiles. Whenfixed to the top of fascia, the ECF teeth slopeforward, to splay and take up the gap whichwould otherwise be open.

data• New and existing work applications• Flexible teeth suit most tile styles• Integral fixing holes• Easy regulation compliance


VENTILATION WHERE ROOFS ABUT WALLS + THROUGH THE ROOF 71

Type RASV ReversibleAngled Soffit Ventilator usePermits entry of air via soffit.

solution The Type RASV strip soffit ventilator is designed foruse with a standard horizontal or sloping soffitboards on roof pitches of 15 degrees or above.The airflow rating is 10,000mm2 per metre run. Theventilation slots provide screening in accordancewith regulations.

data• Reversible profile for sloping soffits• Integral insect screening• Self coloured - corrosion proof• Easy regulation compliance• Available in White & Brown

1 RASV

2 Type SSV

3 Type SSV-RU

4 Type SSV-15

5 Type SV-GP

6 Type USV

Ventilation via the soffit

72 VENTILATION WHERE ROOFS ABUT WALLS + THROUGH THE ROOF


Type SSV Strip SoffitVentilator usePermits entry of air via soffit.

solutionThe Type SSV strip soffit ventilator is designed foruse with a standard soffit board. It permits airflowvia the soffit area whilst also providing support forsoffit boards from 4mm to 14mm thickness.

The airflow rating is 10,800mm2 per metre run,making it suitable for use where the roof pitch is 15degrees or above.

data• Regulation airflow compliance• Integral fly screening• Accepts different soffit thicknesses• Self coloured - corrosion proof• Available in White, Black & Brown

Type SSV-RU Strip SoffitVentilator with ReducedUpstand usePermits entry of air via soffit.

solutionThe Type SSV-RU strip soffit ventilator is designedfor use with a standard soffit board. The RUdesignation refers to a reduced upstand of 5mm.This permits the Type SSV-RU to be fitted into theback location groove of a fascia.

All other details and dimensions are as per thestandard Type SSV. The airflow rating is 10,800mm2

per metre run, making it suitable for use where theroof pitch is 15 degrees or above. The ventilationslots provide screening in accordance withregulations.

data• Regulation airflow compliance• Integral fly screening• Accepts different soffit thicknesses• Self coloured - corrosion proof• Only available in White



Type SSV-15 (for pitches below 15°) usePermits entry of air via soffit.

solutionThe Type SSV-15 strip soffit ventilator is designedfor use with a standard soffit board on roof pitchesbelow 15 degrees. The airflow rating is 25,000mm2

per metre run, making it suitable for use where theroof pitch is 15 degrees or below.

The ventilation slots provide screening inaccordance with regulations.

data• Regulation airflow compliance for pitches

below 15 degrees• Integral fly screening• Accommodates different soffit thicknesses• Self coloured - corrosion proof• Available in White, Black & Brown

Type SV-FL Flat StripSoffit Ventilator usePermits entry of air via soffit.

solutionThe Type SV-FL is a strip soffit ventilator designedfor use with flat and sloping soffit and has anairflow rating of 25,000mm2 per metre run. Thus itmay be used where the roof pitch is below 15degrees.

The ventilation slots provide screening inaccordance with regulations.

data• Flat and sloping roof applications• 25,000mm2 airflow rating• Self coloured – corrosion proof• Insect screening• Available in White & Brown

70mm

20m

m74 VENTILATION WHERE ROOFS ABUT WALLS + THROUGH THE ROOF


Type SV-GP SoffitVentilator - generalpurpose usePermits entry of air via soffit.

solutionThe Type SV-GP is a general purpose soffitventilator strip, with an airflow rating of 25,000mm2

per metre run. In sloping applications it may beused where the roof pitch is below 15 degrees.

The Type SV-GP may also be used to ventilate flatroofs, necessitating the fascia to be fitted so itstands off the masonry face a distance of just70mm. The ventilation slots provide screening inaccordance with regulations.

data• For sloping and flat roof ventilation• 25,000mm2 airflow rating• Self coloured - corrosion proof• Insect screening• Available in White & Brown

Type USV Universal Soffit Ventilator usePreformed strip ventilator for use at soffit levelon new and existing structures.

solutionThe Type USV incorporates a direct fixing methodfrom underneath, which is hidden by an attachablefeature moulding. This permits the ventilation stripto be secured either to a batten attached to thelower inner face of the existing fascia, oralternatively the strip may be secured directly to thefascia bottom edge.

When the moulded attachment is clipped inposition, all screw fixings are hidden from view.

data• Easy upgrade of existing structures• Insect screening• Hidden fixing with cover moulding• Self coloured - corrosion proof• 12,500mm2 per running metre• Available in White & Caramel



Type VF VentilatingFlashing useTo provide flashing and ventilation at roof andwall intersections.

solutionWhere a monopitch roof abuts a masonry wallthere is a requirement to provide ventilation of theequivalent of a 5mm continuous gap. The Type VFVentilating Flashing is manufactured from BritishStandard lead to which is bonded a breathingbase layer that permits air to enter and exit.

When correctly incorporated at the roof / wallintersection, and flashing can provide the airflowrequirement.

Always make provision for air travelling via theflashing to reach the intended parts of the roof.

data• Use in place of ordinary lead• Easy to dress• Ventilates and flashes in one operations• Pre-creased for speedy application• Suits popular roof pitches*• 5000mm2 per running metre

1 Type VF

2 Type RAV-FL

3 Type ERV

4 Contract Slate Ventilator

5 Flush Slate Ventilator

6 Ridge & Hip Dry-Fix Ventilation

Ventilation Where RoofsAbut Walls + Through the Roof

Dotted line showstray position

76 VENTILATION WHERE ROOFS ABUT WALLS + THROUGH THE ROOF


Type RAV-FL RoofAbutment Ventilator useTo provide ventilation where flat roofs abutmasonry.

solutionThe RAV-FL promotes air entry where a flat roofabuts a vertical masonry wall. It is supplied withpre-drilled fixing holes and an integral insect-resistant grille. Each unit is 1.2 metres in length andthe heavy-duty profile incorporates an integralpivothold hinge. This hinge permits easy and directfixing, as the profile may be secured to the verticalboard upstand when opened like a book.

The profile is then closed and fixing completed bysecuring the top of the profile to the masonry wall.An air ventilation path which complies with thecurrent regulations is established at the flat roofintersection.

data• Permits roof to breathe at masonry intersection• Integral insect screening• High airflow - 25,000mm2 per metre run• Removable when re-roofing

Type ERV External Roof Ventilator useTo provide ventilation within flat and low pitchedroofs.

solutionThe Type ERV External Roof Ventilator isdesigned to permit the roof void to breathe andprevent condensation occurring. Intended foruse on lead covered, felted or similarly deckedroofs, the Type ERV is manufactured from lead toBS EN 12588:2006.

When positioned on a plinth or raised surface tosuit the application and location, the Type ERVcan provide a means of exhausting moist air outof the structure.

data• High free airflow of 6,000mm2/12,000mm2

• Natural lead finish• Integral baffles and drain-out slot• New and existing work applications

F A B R I C A T E D F R O M L E A DTraditional Aesthetics – Regulation Performance



Type LSRV Lead SlateRoof Ventilator useTo provide ventilation route via slate roof finish.

solutionManufactured from code 4 lead flashing the TypeSLRV may be introduced into new and existing slatefinishes to provide ventilation of the roof space.Alternatively it may be connected to function as acold extraction external outlet servicing a kitchen orbathroom. The LSRV sits comfortably with all slatessizes. Minimal cutting under the LSRV is required toaccommodate the spigot connection. Natural leadtempers to slate undulations.

The Type SLRV is supplied in dimensions to matchthe slate size you are using. State slate size, andpreferred airflow per ventilator + spigot size.

data• Lead to BS 12588:2006, stainless steel mesh• Base sizes to match all popular slate sizes• Spigot connections of 90mm, 110mm or 150mm• Airflow ranges from 3000mm to 8000mm sq²

(pending base size)• Deflection grille and integral water dam upstand

Contract Slate

Flush Slate

Slate VentilatorsContract and Flush Slate useTo provide ventilation route via slated roof finish.

solutionThe Contract Slate Ventilator can be readily cutto suit both natural and man-made slates. Thissingle model may be used with either 600 x300mm or 500 x 250mm slates. The airflowrating via the protective cowl is 10,000mm2.

The Contract Slate Ventilator may also beemployed to facilitate natural non-mechanicalextraction and ventilation. This is achieved usingthe Contract Connector Kit CS/HD that permitsconnection with a 110mm soil vent outlet. Theairflow rating when this kit is attached is8,000mm2.

The Flush Slate Ventilator may also be suppliedwith a connection kit (ref FL/ILS) that can attachto a 110mm soil pipe or similar.

data• Low profile - high throughput• Integral insect screening• Cut to match slate size• Easy regulation compliance

F A B R I C A T E D F R O M L E A DTraditional Aesthetics – Regulation Performance

AssociatedItemsRelated ConstructionProducts

IMPORTANTValley troughs, running soakers andsupporting products may be used withinroofs constructed to BS5534: part 1 - 1990(slating and tiling) and BS8000: Part 6 –Code of Practice for slating and tiling ofroofs and cladding. Fire resistance SAB toBS476 part 3 and Class 3 of part 7.

Within this section arecomponents andaccompanimentsapplicable to roof spaceaccess, roof constructionand floor service ductprovision.


78 VENTILATION

Ridge & Hip Dry-FixVentilation System usePromotes roof space ventilation at ridge and hip.

solutionFor location on prepared ridge and hipconfigurations. Two-part system consisting of dry-fix roll-out ventilation membrane with corrugatedflashings to both edges. Integral adhesive stripsto underside of flashings initially hold in placeprior to placement and securing of ridges overthe membrane assembly using mechanicallyfixed flexible moulded retaining gaskets.

The flashing section of the membrane can betrimmed back should smaller ridges bedeployed. Provides ventilation at high levels tosatisfy statutory requirement. Also appropriatewhere supporting flow is required to aidventilation via permeable underfelt to addressNHBC directive.

data• Accepts most popular ridge profiles• Eliminates wet trades• Provides statutory airflow• Ridge mechanically fixed• 5000mm2 per running metre to each side


ASSOCIATED ITEMS 79

Type ECSC EavesContinuous Slate CourseuseAs substitute for first (bottom layer) slate courseproviding support and reducing slate cutting.

solutionThe Eaves Continuous Slate Course replaces theeaves first slate course and establishes rigidity andconsistent support off which the slate laying andfixing may commence.

Thus the amount of slate and slate cutting isreduced. Installation is speedy and savings can beachieved in both time and overall purchasing costs.

data• Glass reinforced polyester, 1.83 kg/m2

• Colour black• 360mm wide x 3000mm long• Supplied in packs of 10• Reduces costs and site work• Hidden from view when installed• Robust and easy to handle• Suitable for all standard pitches of slate roof

Type CRSS ContinuousRunning Soaker StripuseContinuous soaker for use with slate roof where itabuts a masonry wall.

solutionThe Continuous Running Soaker Strip is pre-shapedfor immediate use. It resembles lead in colour andmay be employed with conventional lead at thesaddle and the foot. The upstand is unlipped, whicheliminates the necessity to chase into the masonrywall. If fixing is a consideration, the Type CRSS can bedirectly mechanically secured through its upstandtowards the top of the section.

data• Glass reinforced polyester• Colour lead grey• 105mm high x 190mm wide x 3000mm• Suitable for pitches from 221/2 degrees up

to 60 degrees• Pre-shaped for immediate use• Hidden from view when installed• Lightweight and easy to handle• Permits use of conventional saddle and foot

Profile anddimensions of theType CRSS. 10

5

140 50

80 ASSOCIATED ITEMS


Type RBSRoof Bonding StripuseTo link and permit bonding of two dissimilar rooffinishes.

solutionThere is a requirement to link and bond differentroof finishes where they meet within a commonslope. The Roof Bonding Strip is moulded withwater-check ribs either side of a central mortaradhesion area.

Produced to an overall width of 230mm, the TypeRBS is fire resistant in accordance with BS 476, theclassification being to P60 (SAB) class three. It effectively creates an underlying bridge betweenabutting surfaces and may be used as part of afire-break detail, as defined within the BuildingRegulations. This product may normally be usedon roof pitches from 10 degrees up to 60 degrees.

data• Glass reinforced polyester• Colour lead grey• 230mm wide x 3000mm long• Pre-shaped for immediate use• Lightweight and easy to handle

Type VGValley GutteruseWeatherproof and waterproof preformed valleys.

solutionPreformed Valley Gutters are manufactured fromGRP and provide an alternative to the sitefabricated lead valley. Two styles are available foruse with slate roofs or tiled roofs. Both are finishedwith a tough bonded film coat which is colouredto resemble lead and provides excellentweathering qualities.

The Valley Gutter for tiles (VG-T) has integralwater-check ribs to its sides and two sandedmortar adhesion strips. The Valley Gutter forslates (VG-S) is of a deeper profile. Both may beused to satisfy the requirements of roofsconstructed to BS5534:Part 1:1990 (Slating &Tiling) and Part 6 of BS8000. Type VG ValleyGutters are fire resistant in accordance withBS476, the classification to P60 (SAB) class three.

data• GRP with film/gel coat• Available in lengths of 3 metres• Colour grey• Preformed profile• Integral water check ribs


ASSOCIATED ITEMS 81

Hardedge Strip 1500Special Eaves ProtectoruseAlternative felt support and anti-poolinghardedge for eaves protection.

solutionThe Hardedge 1500 or Special Eaves Support as itis also known, is an extended and profiled versionof the 1200 model. It is both longer and wider andoffers even greater support and rigidity.

The front of this Special Eaves Protector extendsforward to carry the projecting roofing feltforward of the fascia. Thus support is provided toa greater extent and the felt is encouraged togravitate and terminate into the adjacent guttering.

Manufactured from rigid polypropylene, theHardedge 1500 / Special Eaves Protector iseasily and speedily fixed in position prior to theroofing felt.

data• Size 1500mm x 300mm (225 + 75mm)• Black polypropylene• Suitable for use on roof pitches from

15 degrees up to 45 degrees• Stops water pooling• Supports felt and carries edge forward to gutter

Type I In-screed Services DuctusePreformed services duct for incorporation withinfloor screeds. Provides designed accessible routesfor service pipes or wiring.

solutionDucts are incorporated on level oversite or subfloors, and the final screed finished flush with theduct top edges. Type I ducts accommodate servicepipes or service wiring, and support can beprovided for pipes using internal clips. Surface floorcovers are available in 12mm plywood, orcomposition board. Special woven seal glass clothintumescent barrier bags are available when ductsrun from one building compartment to another.

data• 140mm x 50mm overall, providing approx

accommodation area of 104mm x 38mm• Standard length 2400mm• Extruded PVCU• Colour white• Keying and stabilising flanges

140

100

5038

18

82 ASSOCIATED ITEMS


Type LADLoft Access DooruseTo gain access into roof space.

solutionPrefabricated and self-finished insulated loftaccess door and frame. Can be fixed immediatelybetween trimmed standard joists. The LAD loftaccess door and frame is supplied as a completeunit. It satisfies the contractor’s total requirementsin terms of aesthetics, finish, cost and stock control.The white laminated door is fully removable, andis supported within a robust white PVC surroundwhich may be directly fixed to standard trimmedjoists. Within the surround are soft (draught) resi-seals which ensure the access door is correctly andcompletely accommodated. As the lid is fullyremovable by lifting upwards, attic insulation canbe cut and laid on top if required.

data• Size 1 550mm x 750mm• Size 2 550mm x 550mm• White compound • A PVCU white laminated door with solid

core of Inskorfoam• Self-finished and ready to use• Insulated• Fully removable door on resi-seals

Notes


ASSOCIATED ITEMS 83

Downward Hinging LoftAccess Door and FrameuseAccess into attic spaces.

solutionHinged downward opening loft access door foruse where a door that can be fitted completelyclear is not required. Available in one size only, thedownward opening model requires a trimmedopening of approximately 560mm x 760mm. Madeof lightweight PVCU and finished in white, theinsulated door has an integral turn latch.

data• Clear opening approx. 630mm x 535mm• Lightweight high impact polystyrene• White finish - requires no painting• Door contains provisional insulation

Cavi120 Type PCLofthatchuseTo provide access into roof space which is also fireintegrity rated.

solutionThe prefix of Cavi 120 denotes this Lofthatch has afire integrity rating of 120minutes. The downwardopening door is supported on a full width zinccoated hinge that provides retention across theentire width of the frame.

The door is secured in the closed position byturning an integral locking bolt accessed via arecessed locking point. Draught strips within theframe compress against the door when locked.The dished steel constructed door retains a firebarrier layer.

When installed the 1.5mm thick frame surroundappears almost flush with the ceiling plaster sovisual presence is minimised.

data• Galvanised steel construction• White finish• Door opening approx 745mm x 530mm• Two hours fire rating• Almost flush finish blends with ceiling

Why is radon presence within a building best avoided?Radon remains the biggest single source ofpublic radiation exposure in the UK. The WorldHealth Organisation (WHO) and theInternational Commission on RadiologicalProtection (ICRP) have recently issued revisedadvice on protection against radon. The adviceincludes recommendations for revisedreference (action) levels because radon hasbeen recognised as being a greater risk tohealth than first thought.

Those most at risk to radon radiation are thoseexposed to high concentrations. Thereforeconstruction incorporating measures to reducesuch levels is the objective.

Dangerous to health?Radon is a natural radioactive gas and there isa risk of lung cancer largely attributable toinhalation of alpha-particle emissions from theradon decay products. The UK governmentfigures acknowledge several thousandavoidable deaths per year are a consequenceof exposure to radon.

How is radon measured?Radon presence is measured in becquerels percubic metre and ideally all domestic propertiesshould have radon readings below 200 Bq mˉ³which was once considered to be anacceptable / tolerable level.

Radon & Methane GasRadon Gas is everywhere - it’s the extent thatvaries and structures are required to be builtso radon exposure risk is minimised.

IMPORTANTEvery building must be designed and constructed in such a way that there will not be a threat tothe building or the health of people in or around the due to the emission and containment ofradon gas. 3.2 BR(S) – mandatory. Every building must be designed and constructed in such away that there will not be a threat to the building or the health of people in or around thebuilding due to the presence of harmful or dangerous substances. 3.1 BR(S) – mandatory.

Whilst the applications described within this section refer predominately to radon gas, the designprincipals and functionality may be applied also to structures where methane gas presencedemands footprint level arrestment as part of a fully appraised system.

Radon Gas

Whilst this is currently the UK regulation actionlevel, the Governments Health ProtectionAgency advocates a target level of 100 Bqmˉ³ acknowledging there is no same radonlevel so the lowest possible is preferable. (The definition of target being the level forwhich one should aim).

Interestingly the action level for commercialproperties is currently twice that of domestic -400 Bq mˉ³ with an explanation that peopleare less likely to spend as long within acommercial property compared with adomestic property.

Paradoxically commercial property includesbuildings where inhabitants reside 24 hours aday, highlighting there is an imbalance ofjustification.

What are the Building Regulations?The Building Regulations require buildingsbeing constructed on radon emitting ground toincorporate protective measures so that actionlevels (for the buildings) are not exceeded.Unfortunately with two UK levels (action andtarget) for both domestic and commercialproperties, is there a danger the easier to meetaction level will prevail and purchasers of newhomes may not be afforded the level offeringless exposure to risk?

The current approach in the UK regarding towhat extent a property is protected againstradon places dependence on reference tomaps. Unfortunately maps do not relate to theradon status of the land upon which theproperty is to be built but to the status of existingproperties in the general area.

As a consequence if low radon levels are shownon a map, a new property can be built withoutradon protection or with minimal radonprotection. Only when the property has beencompleted is one able to really determine itsradon contamination level.

Prof William Angell, Chair of the World HealthOrganisation International Radon Projectadvises it is a long-term misconception thatindoor radon is naturally occurring. Radonindoors is largely caused by the way homes aredesigned and built.

The person(s) who put the building over the land are responsible.This prompts several important questionsdesigner and developer should consider:

Awareness of this health risk exists now, so havedesigner and developer a duty of care toensure the purchaser/inhabitants of thebuilding are not exposed to a health risk?

What will be the designers and developersposition in the future regarding liability if thebuilding (and thus its inhabitants) are notprotected to the extent possible?

Will the building asset value falter in the futureif radon levels within it are higher than intendedor higher than alternatives available that offera better protected standard?

How desirable will the property be if UK radonaction levels are reduced further at some time inthe future – how will it compare?

The response from most clients when asked towhat extent a new property should be protectedis that it should be to the safest and mostpractical level. Achieving this can be bothstraightforward and easy as it simply entailsprotecting the entire footprint of the building,from exterior face to exterior face. By so doingany radon in the ground under the building hasreduced opportunity of entering andaccumulating within the building.

The current UK approach of relying on maps toprovide the only guidance as to whether astructure should be protected against radon isflawed. Maps simply indicate whether there are

structures in an area where radon tests havebeen carried out and elevated levels obtained.

Maps do not take into account that modernstructures by virtue of the new BuildingRegulations will be more airtight and unableto dissipate radon levels in the manner olderstructures permit dissipation.

There is a danger that reliance on maps andthe incorporation of some radon preventionmeasures only will be relied upon by designers,contractors and owners of property as beingadequate to provide protection. Partialmeasures do not address cavities, andfloor/wall interfacing, both of which arerecognised radon entry routes.

It is the person who puts the building over theland who is responsible.

Protecting the entire footprint of a building canremove ’chance’ from the radon equation.

The following pages list our products andsystems available to protect the entire footprintof the building at the most economical stage –when the oversite level is reached.


RADON/METHANE 87

Sump Provision underthe BuildinguseAids reduction of radon pressure fromgranular fill under a protected oversite of abuilding.

solutionPositioned below a floor slab (withmembranes/barriers), the sump provides apassive gas exit route via a ventilation stack. The stack is terminated above the roof finishwith a tile/slate external roof ventilator. Thereception sump may service up to 250m2 floorarea, positioned in the most central location topromote even/optimum evacuation. Inhalationapertures and inlet/outlet portholes permitspur connection to adjoining sumps should thesize or layout of the property dictate.

data• Polypropylene, black. 510mm x 240mm, plus

porthole connections• High-flow passive discharge design• Multi-port connection• Interlink facility• Accepts standard PVC stack

In this example, the membraneis shown under the oversite slab,rather than above it. Whicheveroption is selected to suit theconstruction in question, theoutlet from the reception sump isalways linked to the membraneusing a service pipe flashing.

Both outlet options areillustrated. Vertical stack or up tofour horizontal connections arepossible. Thus gas evacuationcan be to perimeter walls ifappropriate, terminating withround converter and Cavibrick.

Oversite Protection Type N SitesealerMembraneuseRadon and methane gas resistant membranefor use on oversites. General purposesitesealer damp-proof membrane. Tankingand waterproofing applications.

solutionSolid concrete floors and undergroundstructures require a damp-proof andwaterproof membrane to adequately resist thepassage of moisture to the inside of thebuilding. In addition, a membrane with gas-resistance is required when construction takesplace on a methane emitting site and/or a sitesubject to radon gas building controlmeasures. Type N sitesealer membrane issupplied for waterproofing plus gas resistantapplications.

data• Gas membrane roll size: 28.6m x 1.05m = 30m2

• Minimum overlaps: Side: 50mm Ends: 100mm

• High resistance to water pressure, water vapour transmission and gas transmission

• Cross-ply orientated construction• Self-seal bonding, eliminates joint heating

and drying

88 RADON/METHANE


Protection Through the WallusePreformed cavity barriers designed to minimisethe entry of radon gas into the building.

solutionThe barriers are installed in cavity wallsaround the perimeter of a structure. They areso proportioned and shaped to encouragerising radon gas within the cavities, to bearrested and discharged via brick ventilatorsappropriately positioned. The barriers extendthrough at floor slab level and link with theradon resistant oversite membrane.

The combined use of cavity barriers andoversite barriers minimise radon entry into thebuilding envelope which would otherwise takeplace. Thus, levels are reduced within thebuilding and at all times radon-laden air ispromoted to follow a discharge route out ofthe structure, rather than within it.

data• Preformed barriers in all profiles and sizes• Robust Petheleyne mouldings• Satisfies existing guidelines• Provides packaged kit appropriate for area

requirements• High-void gas ventilation format

Oversite Protection Footprint RadonMembraneuseRadon resistant membrane (loose-laid) foruse on oversite.

solutionFootprint Radon Membrane is a loose-laidmembrane supplied in wide rolls. It is primarilydesigned to be installed below or above thetop surface of a suspended floor. It ismanufactured from heavy duty reinforcedpolyethylene and offers good transmittanceand permeability prevention qualities. It is laiddry with all joints lapped and sealed usingintegrity bonding tape.

data• Rolls 25m x 2m and 4m• Thickness 0.4mm• High resistance to water, vapour and gas

transmittance• Radon permeability sample <110x10-12m²s-1


RADON/METHANE 89

Gas Out & Water OutuseTo provide exit route via Cavibricks for gasarrested under cavity barrier.To provide discharge route for water arrestedon upper surface of cavity barrier.

solutionThe introduction of gas control barriers incavities dictates one installs means by which allarrested gas and water can be routed out ofthe structure. Additionally, where servicespenetrate any membrane or barrier the entrypoint must be suitably sealed. A range ofaccessories are available for this purpose:

Cavibricks may be installed in the externalskin under barriers to discharge gas in thecavity trapped below barrier level.

Caviweeps may be installed within perp jointsto discharge penetrating water arrested onthe upper surface of the barrier. (drawing)

data• Material: polypropylene.• Colour: black.• Cavibricks and caviweeps are available in

a range of colours.

Sealing Interruptions ofthe Oversite MembraneuseTo provide positive sealing where service pipesor similar punctuate the membrane.

solutionA range of preformed Petheleyne servicepoint entry sleeves or ‘top hats’ as they areoften termed permit gas tight integrity to bemaintained where the oversite membrane ispenetrated. Standard pipe sizesaccommodated with a bespoke serviceoperating for non-standard requirements.Sleeves may be positively secured usingintegrity sealing tape and a clamping griparound the pipe surround.

data• To suit pipe sizes of 25mm, 55mm, 70mm,

110mm, 135mm, 150mm• Base dimensions 350mm x 350mm or

450mm x 450mm• Material: Petheleyne• Colour: black

How do I place an order?

Contact your merchant. Alternatively simplytelephone, fax or e-mail us direct with fulldetails. We will be pleased to arrange foryou to be invoiced through your favouritemerchant and we will deliver the goods toyour door. E-mail and fax lines are open 24 hours a day.

What exactly should I ask forwhen visiting a Merchant?

Please clearly ask for Cavity Trays Ltd ofYeovil products by name. Having comparedour products with others it is in your interestto ensure your choice is upheld and anyspecification substitution is avoided.

You will receive approved cavitray productswith the benefits that accompany CavityTrays Ltd of Yeovil products only if youadhere to this procedure.

When can I expect delivery?

We use a next day delivery service. Standardboxed goods in stock can normally be sentusing this service, which covers the UKmainland. Simply check when ordering.

Some products require a longer period. If your delivery is outside the UK,individual arrangements apply to specificcountries from the applicable countrydistribution warehouse.

Always Read our main technical manuals for full product information. All advice is inevitably generalised and users should ensure it is relevant

to the specific circumstances in which they seek to apply it.

What if I require help?

Please telephone our Helpdesk using thefreephone number. Lines are open duringweekdays, 8am until 5-30pm. 01935 474769.

Alternatively view our websitewww.cavitytrays.com or [email protected]

How can I learn more aboutCavity Trays Ltd?

Telephone us and ask for our Helpdesk.We welcome talking with you.

Visit our web site, www.cavitytrays.com.Request a CD Rom. Ask for our extensivetechnical manual. Attend a seminar in yourregion (held during most weeks in locationsthroughout the UK). Request a visit from aRegional Manager or request a seminar onyour premises.

What about the productliability warranty?

Approved cavitray products areautomatically accompanied with productliability protection for the benefit of architect,builder and client, at no additional charge.

Please refer to the main productguide for further details andaccompanying requirements.

CAVITY TRAYS LIMITED, ADMINISTRATION CENTREYEOVIL, SOMERSET BA22 8HU

Telephone Yeovil 01935 474769

Email [email protected]

International Calls +44 01935 474769

Fax Yeovil 01935 428223

HELP FREEPHONE0800 7311779

‘The first and only cavity tray manufacturer awarded

European Technical Approval*You cannot purchase a higher standard’.

at time of going to press.

Our PromiseTo supply the construction industry with

robust reliable solutions.

Our PracticeIs based on experience unmatched by any

other specialist in this field.

Our PeopleWork with and are trained by the fourth

generation of the company founders.

Our ProcessMerges experience, modern productionmethods and the very latest standards.

Our PrinciplesTo advance design, service and productsolutions to the highest possible level.

Our PortfolioThe most extensive range with a performance

undertaking for peace of mind.

Cavity Trays LimitedAdministration Centre Yeovil Somerset BA22 8HU England UK

Tel 01935 474769 Fax 01935 428223www.cavitytrays.com

The BWD series continues to be thepocketbook information sourceused by architects, surveyors,builders and contractors.

Use it to identify solutions for yourbest practice construction details.

Cavity Trays Ltd of Yeovil is the onlymanufacturer in its specialised field awarded European TechnicalApproval.

*survey conducted at DCE events.

Don’t lose outPast editions have been requested by over 96% of previous readers*

the book of wise - cavity trays limited trays bowd2… · · 2012-07-20building details best...

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