glidevale cavity trays & preformed dpc's€¦ · uniclass pr_25_57_21_66 february 2018 a cavity...

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CAVITY TRAYS & PREFORMED DPCs

CI/SfB (21.9)Uniclass Pr_25_57_21_66February 2018

Acavity wall is designed to preventmoisture penetrating to the insideface of the wall and causing dampproblems in the building.

In many situations it is necessary to includecavity trays in the wall, to prevent waterpenetration to the inner leaf.

This occurs mainly where the cavity isbridged, eg by lintels above door andwindow openings, over air bricks, ducting,meter boxes etc and where an external wallbecomes an internal wall at a lower level,eg pitched or flat roof abutments, parapetwalls.

Cavity tray problems Cavity trays usually require complexshapes, joints and support, which areextremely difficult to form on site usingsheet dpc materials. As a result, manyinstances of damp penetration result fromincorrectly installed cavity trays.

Cavity trays introduction 2

Intra Weep AT Abutment Trays 4

AT Blockwork Abutment Trays 8

HT Horizontal Trays 11

HTR Refurbishment Trays 14

MCR Preformed Multi-crease system 16

PT Parapet Trays 18

LT Lintel Trays 19

AR Arch & Bullseye Window Trays 20

CT Chimney Trays 21

ASG Abutment Secret Gutter 22

The Glidevale Cavity Tray product range 23

References 24

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TECHNICAL REQUIREMENTS

Cavity wall designIn cavity walls, dpc design should be basedon the assumption that rain will penetratethe outer leaf of brickwork or blockworkand run down the inside face of the wall.Anything which crosses or obstructs thecavity can form a bridge allowing water tocross and soak through the inner leaf,causing damp within the building.

For this reason, building regulations requirecavity trays to prevent water penetrationwhere the cavity of an external wall isbridged or where an external wall becomesan internal wall at a lower level. Cavity traysare designed to ensure that water isdiverted to the outer leaf or clear of thebridge.

Cavity trays are necessary in both doubleleaf masonry construction and masonrycladding to timber frame construction.

Where cavity trays are neededTo prevent rain penetration to the inner leaf,cavity trays are needed:

- Where an external wall becomes aninternal wall at lower level, eg at roof/wallabutments and parapets.- Where the wall cavity is bridged, eg by alintel, air brick, ducting or meter box.

Open porches/car portsCavity trays are only required at roofabutments where the abutment wallbecomes an inner wall below the roofline.Open porches and car ports are nothabitable spaces, and therefore are notrequired to have cavity trays. However, if itis possible that a future occupier mightenclose the space, we advise installingcavity trays when first built, to save costlyretro-fitting at a later date.

TECHNICAL SOLUTIONS

Approved Document C Site preparationand resistance to contaminants andmoistureApproved Document C does not givedetailed solutions using cavity trays, butrefers to BS codes. The Glidevale solutionsshown on following pages enable therecommendations of these codes to be met.

Internal and external walls (moisturefrom the ground) 5.4 - 5.6 Technical solution includes adamp-proof course, continuous with anydamp-proof membrane in the floor, andwhere necessary a damp-proof tray to preventprecipitation passing into the inner leaf.

Alternative approach By paragraph 5.6 therequirement can also be met by followingthe relevant recommendations of Clauses 4and 5 of BS 8215 Code of practice fordesign and installation of damp-proofcourses in masonry construction.

Cavity external walls (moisture from the outside)5.12 - 5.15 Technical solution includes acavity at least 50mm wide, which can bebridged only by wall ties, cavity traysprovided to prevent moisture being carriedto the inner leaf, and cavity barriers,firestops and cavity closures, whereappropriate.

Alternative approach By paragraph 5.14the requirement can also be met byfollowing the relevant recommendations of BS EN 1996-2: 2006 Design of masonrystructures. Design considerations, selectionof materials and execution of masonry.

CAVITY TRAYS INTRODUCTION

CONVENTIONAL TRAYS PROBLEMS

Many current failures in buildingconstruction can be traced to faulty damp-proof courses and cavity trays caused by:

● Incorrect choice of materials

● Inadequate and incorrect detailing

● Faulty installation.

Many common details required in cavitytrays such as corners, ends and changes inlevel cannot be formed satisfactorily on sitefrom normal dpc sheet materials. Externalcorners in particular are almost impossibleto form on site without leaving gaps wherewater can penetrate.

Difficult junctions have traditionally been leftto the bricklayer on site to resolve. It mayno longer be sufficient to rely on siteexpertise, and often there is little incentivefor the bricklayer to do a careful job informing corners and junctions.

Modern standards of construction demanda better solution.

Faults and solutionsInvestigations by the Building ResearchEstablishment have revealed many faults ininstalled dpcs and trays, see the tablebelow.

Once the building is completed, remedialaction to correct these faults is very costly.

The expense of taking the trouble to ensurea correct installation in the first place, usingpreformed components, is negligiblecompared with the cost of putting faultsright after the building is completed andoccupied.

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Common faults found in dpcs and trays by BRE

Omission of stop ends

Cut pieces butt jointed at corners

Trays not properly tucked into the lower leafTrays not properly supportedTrays not fixed to timber framing

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● Trays are specifically designed to avoid the faults most often encountered with conventional materials.

● All components are preformed or pre-creased, avoiding the need to create complex shapes on site.

● AT Abutment and HT Horizontal Traysare available with optional factory-fitted flashings. These are pre-shaped and securely attached to the trays, so providing a quicker and more reliable installation.

● Integral ribbing or textured finish provides an excellent mortar key.

● Manufactured from robust polypropylene sheet (unless otherwise stated in product descriptions), the trays are virtually indestructible on site.

● Resistant to acids, sulphates and alkalis likely to come into contact with the trays on site.

● One basic design is suitable for all masonry and timber-frame cavity walls.

● A simple range of components for each application makes specifying and ordering very easy.

● The majority of cavity trays are made from recyclable materials.

Glidevale solutionsThe Glidevale range of preformed cavitytrays has been specifically designed toovercome all the disadvantages ofconventional trays. They are easy toinstall and provide very reliableprotection against water penetration.There are types to suit almost everyinstance in which cavity trays arerequired.

The Glidevale Cavity Tray range has beendeveloped over many years of intensiveresearch and design starting from firstprinciples. Having analysed the problemsof traditional damp-proof coursematerials and current proprietarypreformed cavity trays, Glidevale canoffer the only range of cavity trays whichovercomes the detailing and installationproblems of existing products.

Glidevale Cavity Trays incorporatefeatures and benefits across the range toachieve reliability through ease ofinstallation.

Without cavity tray -rain penetration

With cavity tray - no rain penetration

Pitched roof side abutment

Pitched roof top abutment

Flat roof abutment

Lintel - no stopends

Airbrick, ducting, meter box etc

Lintel tray with stopends

Standard and bespoke specialsGlidevale offer a full range of standardspecials such as arch trays, bullseyewindow trays and chimney trays, and canprovide quotations within 24 hours.

In addition a free design service can beprovided for bespoke preformed, mouldedor welded accessories including pre-creased roll to suit precise designrequirements.

Technical supportGlidevale can provide a comprehensivetechnical advisory service covering productadvice and selection, estimating, and dpcdesign for residential or larger commercialprojects designed to meet all regulatoryrequirements. Simply forward floor plans,elevation and section drawings and we willprepare a detailed quotation covering allcomponents required. Alternatively contactour Technical Services Department forassistance.

BENEFITS

Quality assuranceThe Glidevale Cavity Tray range has beenappraised under BS EN 9001 which covers design and development as well as manufacture, giving an independentlyaudited and monitored assurance that the products are designed to meet theirintended purpose.

Glidevale solutions

Preformed stop ends with pre-applied seal at overlaps

Preformed internal & external cornerswith pre-applied seal at overlaps

Trays are self-supporting across the cavityand do not require tucking into the innerleaf or fixing to timber framing

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ABUTMENTS: PITCHED ROOF/WALL

UseAT Abutment Trays offer preformed cavitytray solutions at the junction where thesloping edge of a pitched roof abuts a wall.

The need for a tray at this point is not alwaysfully appreciated; flashings and soakers arenot sufficient. Below the roof line the externalleaf of brick or blockwork becomes aninternal wall, so it is necessary to prevent anymoisture that penetrates the outer leaf fromrunning down and into the building. NHBCStandards for ‘External masonry walls’section 6.1-D6 (a) and BS 8215 ‘Design andinstallation of damp proof courses in masonryconstruction’ specifically recommend the useof preformed abutment cavity trays.

Intra Weep AT Abutment Trays aremanufactured from polypropylene and areavailable with optional factory-fittedAluFlash or lead flashings, avoiding theneed to cut and dress flashings on site.

Intermediate TrayRight Hand

Intra Weep Apex TrayIdentical to the Catchment Tray and the last to be built-in to the outer leaf. Depending upon its position inrelation to the brickwork joints, one or both upstandsmay need to be removed to avoid cutting bricks whichwill be visible on completion; this allows water todischarge to either side.

Intra Weep Intermediate TrayIntermediate Trays are handed, with an upstand at oneend preventing water from entering the cavity. Each trayhas an integral weep to divert water safely on the the roof covering. Each tray must overhang the next by not less than 100mm.

Corner Catchment Tray set For a roof abutting an external corner of a wall. Itretains the integrity of the dpc, provides integral weepand reduces the visual impact of the flashing.Left hand set shown.

Intermediate TrayLeft Hand

Tray 2Tray 3

Tray 1

AT Tray range Intra Weep Catchment TrayThe first tray to be built-in to the outer leaf. Upstands atboth ends ensure water cannot enter the cavity and issafely diverted on to the roof covering. The central channel discharges any water that may run down from the trays above.

Abutment without cavity tray

Abutment with cavity tray

stepped cover flashing

wind-driven rain penetrates the outerleaf, but is caught by the cavity tray anddischarged to the outside

wind-driven rain penetratesthe outer leaf and flowsdown its inside face

water soaks through to the inside of the wall,causing dampness and mould growth

stepped cover flashing (may be factory-fitted to tray)

Glidevale Intra Weep Abutment Cavity Tray

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� Universal design For 20º to 55º roof pitches (see Table 1 overleaf).

� Integral weepThe unique integral weep discharges on tothe roof slope to meet the requirement of BS 8215 that “at least one weephole isrequired per cavity tray” for stepped cavitytrays. Avoids the build-up of water flowtowards the bottom of the run, and the risk ofleakage if any one unit is badly installed, or ifmortar droppings cause blockage.

Advantages

Installation of flashing� Comprehensive installationinstructions provided.

AT Trays with flashing

Apex Tray

Intermediate Tray left hand

Intermediate Tray right hand

Catchment Tray left hand

Catchment Tray right hand

� Integral pitch marksLocated on the back of each tray,these help easy and quickinstallation and avoid incorrect positioning on site.

� 140mm upstand Meets or exceeds the requirements of BS EN 1996-2, BS 8215, andNHBC Standards. It is self-supporting, enabling thetrays to be used with cavities ofany width from 50mm upwards.

� Self-supportingInner and outer leaves ofthe wall can be builtindependently, becausethe tray does not need tobe tied to the inner leaf.This avoids the need to cutblocks horizontally andsaves time.

� Factory-fitted AluFlash*or lead flashing(optional) Trays are also availablewith factory-fitted AluFlashor code 4 lead flashings to BS EN12588 (Code 5available to special order).The flashing, secured byheavy duty stainless steelstaples, together with theweather protection lip andthe bitumen butyl seal,provides completeprotection against weathergiving a driving rainresistant solution in eventhe most exposed sites.When installed the sidelapexceeds the minimum LSArequirement of 50mm.

Removal of tab

Before mortar has set

� Fleximouth mortar barrierActs as a mortar barrier onthe lower leading edge of thetray during installation. Oncethe mortar has set, theprotruding tab is pulled andthe hinge breaks awayleaving a 25mm deep groovein accordance with LeadSheet Associationrequirements. This allows fora flashing to be installedwithout the need to rake outthe joint, which coulddamage the tray.

weather protection lip

protruding tabintermittent hinge

mortar barrier 25mm deep groove

flashing

bitumen butyl seal

heavy dutyfixing staples

* Short flashings embossed finished, long flashings cross-corrugated finish

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*Add /L for long flashing or /S for short flashing. Use long flashings for dressing over profiled tiles. Use short flashings fordressing over the upstand of soakers. For flat interlocking tiles see ASG Abutment Secret Gutter.**For 2.5º increments use the tray designed for the next higher pitch, eg for a 32.5º roof pitch, use a 35º tray.

Table 1 Intra Weep AT range and Corner Catchment Tray Set for brickwork

Tray type Length Code For roof(mm) left hand right hand non handed pitches

Without flashings Intermediate 310 AT302 AT301 20º - 55º

Catchment/Apex 320 AT300 20º - 55º

Corner Catchment Set CCS LH CCS RH 20º - 37.5º, 40º - 50º, 55º

With factory-fitted Intermediate 310 AT302* AT301* 20º, 25º, 30º, 35º, 40º, 45º, 50º, 55º **

flashings Catchment 320 AC302* AC301* 20º, 25º, 30º, 35º, 40º, 45º, 50º, 55º **

Apex 320 AT300* 20º - 35º, 40º - 55º

Corner Catchment Set CC LH* CC RH* 20º, 25º, 30º, 35º, 40º, 45º, 50º, 55º **

minimum 50mm overlap between flashings

Trays with factory-fittedflashings.Recommended forexposed locations

Intra Weep intermediate tray (cutting of bricks will be necessary in most cases, however flashings will cover this).

Single step flashingContinuous stepflashing

Typical application:alternative flashings

Flashing fitted afterinstallation of trays andcompletion of brickwork

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Specification clausesIntra Weep AT AbutmentTrays for brickwork

Provide cavity trays atroof/wall abutments tocomply with BS 8215.Trays to be GlidevaleIntra Weep AT AbutmentTrays, preformed, self-supporting, each traywith integral weep, andpitch marks. *Trays without factory-fitted flashing: Aftermortar has set, removemortar protector fromeach tray to leave 25mmdeep groove for flashingto comply with LeadSheet Associationrecommendations.

*Trays with factory-fittedflashing: Each tray tohave factory-fittedAluFlash or code 4 leadflashing to BS EN 12588with butyl seal betweenlead and tray, to suit roofpitch and covering.Corner Catchment TraySet for BrickworkProvide cavity trays atcorner abutment junctionto comply with BS 8215.Trays to be GlidevaleCorner Catchment TraySet, preformed and self-supporting with integralbedweep.

*Tray Set ref: CCRH/LH* 20-37.5º/40-50º,55º * (without factory-fitted flashing).

*Tray Set ref: CCRH/LH* pitch L/S*, withfactory-fitted AluFlash orcode 4 lead flashing to BS EN 12588, with butylseal between lead andtray, to suit roof pitch.

All traysInstall in accordance withmanufacturer’sinstructions.

*delete as appropriate.

Supplied by Glidevale,2 Brooklands Road,Sale, Cheshire M33 3SS,Tel: 0161 905 5700. Fax: 0161 905 2085. Email:[email protected].

Corner Catchment Tray set: installationPosition trays in successive courses of brickwork

Tray 1 Tray 2 Tray 3 AT Tray

Apex TrayOne or both upstands removed toretain brick bond

Intermediate Trays

Corner Catchment Tray set

Typical application: corner abutment

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UseAT Trays for abutments to blockwork areavailable in three sizes for different roofpitches and course heights (see Table 2).Manufactured from polypropylene.

Intermediate Trays are handed. Catchmentand Apex Trays are identical and suit allroof pitches from 25º to 55º. Due to the sizeof blocks compared to bricks (typically225mm course height) the trays do not sitdirectly on top of each other, and the AT100Connector Unit is used to weather thevertical face of all blocks between trays.

Aluflash Secret Gutter or ASG Abutment Secret Guttersee page 22 for furtherdetails

AT Blockwork Tray range


Apex Tray/Catchment Tray


AT Blockwork Intermediate Tray withfactory-fitted shortAluFlash* or lead flashingdressed over gutterupstand

AT100 Connector Unit

225mm

AT100 Connector Unit(cut down for 150mm course height)

110mm110mm

polystyrene stripto assist in rakingout joint for site-fitted flashing

length according to roof pitch

75mm

102mm

flat interlocking tiles

Underlay omitted for clarity

Typical application

* Short flashings embossed finished, long flashings cross-corrugated finish

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Trays with factory-fitted flashingAT Blockwork Trays are also availablewith optional factory-fitted AluFlash orlead flashings, avoiding the need to cutand dress flashings on site.

Catchment and Apex Trays with factory-fitted flashing differ, and the Catchmentand Intermediate Trays are handed.

Table 2 AT Trays for Blockwork

Roof pitch** Course height†150mm 225mmleft hand right hand left hand right hand

Intermediate Trays (available with or without flashing)

25º AT602* AT601* AT602* AT601*30º AT402* AT401* AT602* AT601*35º AT402* AT401* AT602* AT601*40º AT302* AT301* AT402* AT401*45º AT302* AT301* AT402* AT401*50º AT302* AT301* AT302* AT301*55º AT302* AT301* AT302* AT301*

Catchment/Apex Trays (without flashing)25º - 30º AT600 (non-handed) AT600 (non-handed) 35º - 45º AT300 (non-handed) AT600 (non-handed)50º - 55º AT300 (non-handed) AT300 (non-handed)

Catchment Trays (available with flashing)25º - 30º AC602* AC601* AC602* AC601*35º - 45º AC302* AC301* AC602* AC601*50º - 55º AC302* AC301* AC302* AC301*

Apex Trays (available with flashing)25º - 35º AT600* (non-handed) AT600* (non-handed) 40º - 55º AT300* (non-handed) AT600* (non-handed)

Connector Unit (used with all trays)25º - 55º AT100 (non-handed) AT100 (non-handed)

*Add /L for long flashing or /S for short flashing and /150 or /225 to denote course height.Use long flashings for dressing over profiled tiles. Use short flashings for dressing over the upstandof soakers.For flat interlocking tiles see ASG Abutment Secret Gutter.**For 2.5º roof pitches, use the tray designed for the next higher pitch, eg for a 32.5º roof pitch use a35º tray.†For 75mm course heights use Intra Weep Abutment Trays.


Catchment Tray left hand

Catchment Tray Right hand


Apex Tray

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Rendering to reduce exposed lead

expanded metal fixed to blockworkextending down to bead, toprovide key for rendering

flashing visible

150mm

bellcast beadfixed toblockworkforming stopfor rendering

roof underlay

Appearance of flashingDue to the size of blocks the amount ofexposed flashing may not be aestheticallyacceptable. This can be reduced by one ofthe the following methods:

Using brickwork around the cavity traysThe bricks will be hidden by the flashings.In this case use Intra Weep AT AbutmentTrays, see page 10 for further information.

Rendering the wallRendering should not be applied directly toflashings as this restricts movement andcould cause splitting of the flashing ordetachment of the rendering. Fix expandedmesh to the blockwork, extending down toa bellcast stop bead 150mm off the finishedroof line, partly covering the lead; thisprovides a key for the render and enablesthe lead to move. The rendering will block the tray dischargechannels, so an MV650 MicroventWeephole is supplied with the CatchmentTray. Ensure this is kept clear of render andmortar.

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Specification clausesAT Trays for blockwork(without factory-fittedflashing)Provide cavity trays atroof/wall abutments tocomply with BS 8215.Trays to be Glidevale ATBlockwork AbutmentTrays, preformed andself-supporting. Install inaccordance withmanufacturer’sinstructions. Afterinstallation rake outpolystyrene strip fromeach tray to leave 25mmdeep groove for flashingto comply with LeadSheet Associationrecommendations.AT Trays for blockwork(with factory-fittedflashing)Provide cavity trays atroof/wall abutments tocomply with BS 8215.Trays to be Glidevale ATBlockwork AbutmentTrays, preformed andself-supporting, eachtray with factory-fittedAluFlash or code 4 leadflashing to BS EN 12588with butyl seal betweenlead and tray, to suit roofpitch, roof covering andcourse height. Install inaccordance withmanufacturer’sinstructions.

Supplied by Glidevale, 2 Brooklands Road,Sale, Cheshire M33 3SS,Tel: 0161 905 5700. Fax: 0161 905 2085. Email:[email protected].

The size of cover flashings required forblockwork abutments can be very large andexpensive. It is possible to maintain theweather integrity of the abutment and bothimprove the finished appearance andreduce the cost of the flashings by utilising75mm coursed Intraweep trays along theline of the abutment and subsequently‘course out’ above the trays to resume thelarger module size of the blocks. thecoursing work will be hidden by thesubsequent render application as shown.

Random course stoneworkThe random nature of natural stoneworkcourse heights can result in variable, andsometimes, unsightly weather flashingsalong the line of the roof abutment,detracting from the overall aesthetics.

Coursing in with 75mm course heightIntraweep trays along the line of theabutment will provide a neat, consistent

coursing to the flashings, and thestonework can be coursed above theabutment line to retain it's randomappearance.

Any coursing work below the cavity trayswill be completely hidden by thesubsequent weather flashings as depicted here.

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WALLS, ABUTMENTS

Use HT Horizontal Trays are used:- at top edge abutments of lower level pitched roofswhere flat roofs abut the outer leaf of a cavity wall- at changes of level where AT Trays arenot appropriate, eg on sloping ground- where brickwork is built off a concreteslab or structural ring beam- at the base of masonry cavity walls- over air bricks, ducting and other services which bridge the cavity.

Advantages� Suitable for brickwork and blockwork.� Self-supporting design allows trays to beused with cavity widths from 50mmupwards without the need to build-in tothe inner leaf.

� Avoids the need to build inner and outerleaves together and to line up bed jointsin brickwork and blockwork leaves.

� The tray lip projects slightly from the wallwhen installed. This gives a neaterappearance than conventional dpcs andprevents pointing over, a common fault.

� Preformed from ABS, with internal andexternal angles and stop ends.

� Optional factory-fitted AluFlash or leadflashings remove the need to rake outjoints and point in flashings, saving time,cost and additional trades.

� Integral butyl jointing bead ensuresoverlap of at least 100mm asrecommended by BS 8215 (Section 6.3Table 3). Each component has a pre-applied butyl seal.

� Complies with BS EN 1996-2.� Comprehensive installation instructionsprovided.

HT Tray range

HT5 Horizontal Tray, 1125mm lengths (5 brick module).Shorter lengths also available or can be easily cut on site

HT21 Internal cornerHT22 External cornerOvercome the problemof site fabrication ofdifficult junctions.Overlap with HT Trays toform a continuousweatherproof cavity tray.

HT11 Left hand stop endHT12 Right hand stop end Provide protection to theends of a tray run, preventingmoisture from entering thecavity in compliance with BS EN 1996-2 and BS 8215.

Bed Weep or MV650 Perpend WeepOption of fitting in bed or perpend jointto allow water to drain from the trays incompliance with BS EN 1996-2 and BS 8215. The Bed Weep mortarprotection tab is removed afterinstallation to leave a clean and effectiveweep hole.

58mm 100mm

mortarprotection tab

1125mm

145mm

151mm

MV650

Bed Weep

150mm

150mm

100mm

250mm 250mm

150mm

100mm

150mm

250mm 250mm

147mm

67mm

15mm

Factory applied butyljointing bead

Factory appliedbutyl jointing bead

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Fixing position of Monoventvaries according to roof pitch

Long flashing for roof pitchesbelow 30º or deeply profiledroof tiles

HT Horizontal Trays withfactory-fitted flashing

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WALLS, ABUTMENTS

Table 3HT Trays with factory-fitted flashing

Tray type Brick module Length (mm)code†

HT3 3 675HT4 4 900HT5 5 1125HT21 Internal corner - HT22 External corner -†Add /L for long flashing or /S for short flashing.

Installation of external and internal corners

Roof pitch 30º or aboveHT Tray with short factory-fitted lead flashing

Roof pitch below 30ºHT Tray with longfactory-fitted leadflashing

Use of HT Trays with factory-fitted AluFlash orlead flashing and MR50 Monovent providing unobtrusive ventilation to top edge abutments of lean-to roofs.

Short flashing for roof pitches30º and above

HT22 External Corn

Tray lip prevents mortar bridge

HT Internal corner

HT External corner

* cross-corrugatedfinish only

HT Trays with factory-fitted flashingHT Trays are also available with factory-fitted AluFlash* or code 4 lead flashings to BS EN 12588, for use at the abutment of alean-to or flat roof with a wall. HT traysfitted with AluFlash are supplied with225mm flashings suitable for all applications.

Long or short lead flashings are available todress down over the roof covering inaccordance with Lead Sheet Associationrecommendations as follows:- long flashings: roof pitches below 30º- short flashings: roof pitches 30º and above.

For flat roofs use the short flashing to coverthe roof upstand by a minimum of 75mm.Where high-level ventilation is required, useHT Trays with short flashings and the MR50Monovent (refer to the Glidevale AbutmentVentilation Brochure).

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Specification clausesHT Horizontal Trays(without factory-fittedflashing)Provide horizontal cavitytrays to comply with BS 8215. Trays to be Glidevale HT HorizontalTrays, preformed andself- supporting. Install inaccordance withmanufacturer’sinstructions using BedWeeps and other HTTray accessories, withpre-applied butyl seal ateach overlap.

HT Horizontal Trays(with factory-fittedflashing)Provide horizontal cavitytrays to comply with BS 8215. Trays to be Glidevale HT HorizontalTrays, preformed andself- supporting. AluFlashor code 4 lead flashing to BS EN 12588 factory-fitted to each tray withbutyl seal between leadand tray, to suit roofpitch. Install inaccordance withmanufacturer’sinstructions using BedWeeps and other HT Tray accessories,with pre-applied butylseal at each overlap.


Typical applications

Meter box bridging the cavity

ner

Structural ring beam

Bed weep supplied separately

HT21 Internal Corner

HT Horizontal Tray

Bed Weep

HT Horizontal Tray

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WALLS, ABUTMENTS

HTR REFURBISHMENT TRAYS

UseHTR Refurbishment Trays are used forrefurbishment work and repairs to failedcavity trays. HTR Trays are particularly usefulwhere an extension with a lean-to or flatroof is built against an existing cavity wall.

Advantages � Each 550mm unit is supplied with anintegral bedweep, so no separateweepholes are required.

� The 2 1/2 brick length is designed forease of sequential installation.

� The self-supporting design allows thetrays to be used with cavities of varyingwidth from 50mm upwards without theneed to build-in to the inner leaf.

� The tray lip projects slightly from the wallwhen installed. This gives a neaterappearance than conventional dpcmaterials and avoids being pointed over,a common fault which can form a bridgefor damp.

� Complies with BS EN 1996-2.� Comprehensive installation instructionsprovided.

HTR Trays with factory-fitted flashingHTR Trays are also available with factory-fitted AluFlash* or code 4 lead flashings to BS EN 12588, for use at the abutment of alean-to or flat roof with a wall. Theseremove the need to rake out joints andsubsequently point in flashings, savingtime, cost and the need for additionaltrades.Long or short flashings are available todress down over the roof covering inaccordance with Lead Sheet Associationrecommendations as follows:- long flashings: roof pitches below 30º- short flashings: roof pitches 30º and above.

For flat roofs use the short flashing to coverthe roof upstand by a minimum of 75mm.Where high-level ventilation is required, useHTR Trays with short flashings and theMR50 Monovent.

HTR Tray with factory-fitted flashing

HTR Refurbishment Tray

Bed Weep

HT22 External corner

HT21 Internal corner

* cross-corrugated finish only

150mm

150mm

100mm

250mm 250mm

150mm

100mm

150mm

250mm 250mm

HT11 Left hand stop endHT12 Right hand stop end Provide protection to the ends ofa tray run, preventing moisturefrom entering the cavity incompliance with BS EN 1996-2and BS 8215.

147mm

67mm

15mm

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Specification clauses

HTR RefurbishmentTrays (without factory-fitted flashing)Provide horizontal trays tocomply with BS 8215.Trays to be Glidevale HTRRefurbishment Trays,preformed and self-supporting with integralweep. Install inaccordance withmanufacturer’sinstructions using wherenecessary HTRaccessories, with pre-applied butyl seal at eachoverlap.

HTR RefurbishmentTrays (with factory-fittedflashing)Provide horizontal trays tocomply with BS 8215.Trays to be Glidevale HTRRefurbishment Trays,preformed and self-supporting with integralweep. AluFlash or code 4lead flashing to BS EN 12588 factory-fitted to each tray withbutyl seal between leadand tray, to suit roof pitch.Install in accordance withmanufacturer’sinstructions using wherenecessary HTRaccessories, with pre-applied butyl seal at eachoverlap.


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Installation method

Cut out three bricks.Fit an HT11 stop end toan HTR Tray unit andinstall on a bed of mortarat the start of the run.

Continue along the wallin the same way. Fit a HT12 stop end atthe end of the run.

Install the next HTR Trayunit on a mortar bed,overlapping the first tray by 100mm and sealing the joint with the integralbutyl jointing bead.

Replace two bricks,wedged and bedded onmortar, then cut out thenext two bricks.

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MCR PREFORMED MULTI-CREASE SYSTEM

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PREFORMED MULTI-CREASE SYSTEM

Internal corner surface-fixed

Column stop endbrick/block-brick (right hand shown)

150mm

100mm

100mm

150 or 225mm

100mm 100mm

UseThe Glidevale Preformed Multi-creasesystem has been developed for use inlarger commercial projects where theremay be many repetitive or complex cavitytray design details. The system comprisespreformed straight runs and moulded orwelded accessories, all purpose-made inpolypropylene copolymer to match exactlythe constructional detailing.

Advantages� Bespoke products reduce wastage onsite and ensure a faster installation thantraditional methods.

� Preformed moulded or weldedaccessories remove the need for sitefabrication and are more reliable.

� Cavity tray widths and other dimensionstailored to each application and detail.

� Proven bitumen butyl jointing system. � Trays do not require support across thecavity.

� Non-slip textured finish for improvedmortar adhesion.

� Complies with BS EN 1996-2: 2006 and BS 8215: 1991.

� Factory-fitted AluFlash or code 4 leadflashings to BS EN 12588: 2006 availablewhere required, in a range of weights.

AccessoriesCommonly used preformed accessories areshown and can be made to order.

Some units are designed for building-in toboth leaves of a cavity wall: either brick-brick or brick-block. Others are built-in tothe outer leaf and rest against the face ofthe inner leaf, column etc.

Preformed sectionsCommonly usedpreformed sections; othershapes can be made toorder.

100mm

Stop endbrick/block-brick (right hand shown)

150 or225mm

100mm

60mm

50, 75 or100mm

Internal/external cornerbrick/block-brick

150 or225mm

50, 75 or100mm

100mm

100mm

100mm

Beam/column stop endbrick/block-brick (right hand shown)

100mm

150 or 225mm

150 or 175mm

16

100mm

50, 75 or100mm

Stop endsurface-fixed (right hand shown)

150mm

50, 75 or100mm

60mm

100mm

100mm

75 or 225mm

50, 75 or100mm 100mm

100mm

225 or 150mm

100mm

Change of levelbrick/block-brick (right hand shown)

External cornersurface-fixed

150mm

100mm

50, 75 or 100mm

100mm

100mm100mm

Change of levelsurface-fixed (right hand shown)

150mm

100mm

100mm

100mm50, 75 or100mm 100mm

75 or 225mm

MCR preformed cavitytrays to fit around column

Bed weep

Column at intermediateconcrete floor

Window sills

Bed weep

Tray continuesbeyondwindow revealwith preformedstop end

MCR preformedcavity tray unit


Cavity closer

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17

PT PARAPET TRAYS

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WALLS, PARAPETS

Use PT Parapet Trays, manufactured from pre-creased polypropylene, are used forparapet walls to flat and pitched roofswhere both brick skins are exposed toweather. BS EN 1996-2 and BS 8215 recommend acavity tray stepped down at least 150mm.There is no recommendation as to whichway the tray should step down. If stepped inwards, moisture could travelalong the underside of the tray and into thebuilding; however, this is only likely in veryexposed situations. If stepped outwards,the tray will direct water to the outer face ofthe wall which may cause staining.

Specification clause

PT Parapet TraysProvide parapet trays tocomply with BS 8215.Trays to be preformed Glidevale Parapet Traystied to both inner andouter leaves, preformedand self-supporting.Install in accordance withmanufacturer’sinstructions using BedWeeps and other PT Trayaccessories, with pre-applied bitumen butylseal at each overlap.


Advantages� Can be installed to direct water inwardsor outwards as required.

� Complies with BS EN 1996-2 and BS 8215.

� Comprehensive installation instructionsprovided.

� Formed from continuous roll to reduce joints and overlaps.

PT Parapet Tray

Coping System

PT Tray directing water outwards

PT Tray directing water inwards

100mm

150 or225mm

100mm50, 75 or100mm 100mm

100mm

100mm

100mm

150 or225mm

50, 75 or100mm

Bed Weep or MV650 Perpend WeepOption of fitting in bed or perpend joint to allow water todrain from the trays in compliance with BS EN 1996-2 andBS 8215. Gives a neater appearance than an openperpend. The Bed Weep mortar protection tab is removedafter installation to leave a clean and effective weep hole.

Tape2m x 12mm Bitumen Butyl Jointing Tape

100mm58mm

PT22 Universal Corner 90ºReversible for internal orexternal corners, and todischarge outwards orinwards.

PT12 Stop End(right hand)Prevents moisturefrom entering thecavity at the ends oftray runs. PT11 Stop End for lefthand applications (notshown).

18

LT LINTEL TRAYS

WINDOW AND DOOR OPENINGS

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Use LT Lintel Trays, manufactured from pre-creased polypropylene, are used with steellintels over openings. Steel lintels aresometimes claimed to act as cavity trays,but they lack stop ends, so there is a risk ofwater leakage at the ends unless they areextended well beyond the length needed forstructural purposes. BS EN 1996-2 and BS 8215 recommend the use of cavity trayswith stop ends over all openings. There isalso a risk of corrosion of the lintel if theprotective coating is scratched duringbricklaying.

LT Lintel Trays with LTU Stop Ends solve allthese problems. As steel lintels should lastat least 60 years, they are a small price topay for added protection.For concrete or stone lintels it is normallypossible to use HT Horizontal Trays with stop ends.


LT Lintel TraysProvide lintel trays at allopenings to comply withBS 8215. Trays to be

Glidevale LT Lintel Trays,preformed and self-supporting. Install withBed Weeps and LTULintel Tray Stop Endswith pre-applied bitumenbutyl seal, in accordancewith manufacturer’sinstructions.

Supplied by Glidevale,2 Brooklands Road,Sale, Cheshire M33 3SS,Tel: 0161 905 5700.Fax: 0161 905 2085. Email:[email protected].

Typical application

LT Tray bedded on flangeof steel lintel (not tied into inner leaf)

tray rises minimum150mm across cavity (BS EN 1996-2)

Bed Weep

Cavity Closer formsvertical dpc

bricks bedded on mortaron LT Tray

LTU Stop End

Advantages � Suitable for brickwork and blockwork.� Self-supporting design can be used withcavities from 50mm to 100mm withoutbuilding-in to inner leaf.

� Stop Ends supplied separately can bepositioned to fit brick perpends.

� Complies with BS EN 1996-2.� Non-slip textured finish for improvedmortar adhesion.

� Supplied by the metre to a maximum of50m per roll; accommodates 1, 2 or 3brick course heights.

� Suits most common types of steel lintelincluding Catnic, IG, BAT, Dorman Long,Birtley, Rom, Hilsmith and Asset BuildingComponents.

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ARCHES AND CURVED OPENINGS

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UseGlidevale arch trays provide fully effectivedpc protection to cavity walls above archedand curved openings.

Self-supporting designs do not need tyingin to the inner leaf. LTU Stop Ends and BedWeeps supplied separately.

Conventional dpcs cannot be easily sitefabricated into a suitable shape for archprotection. The common practice ofproviding a horizontal dpc across the crownof the arch leaves the arch masonry andadjacent brickwork unprotected against water penetration.

BE Bullseye Window TrayPreformed 360º tray providing full dpc protection around a circular or bullseye window.

Advantages� Purpose-made to window size.� Positively drains to the outside.� Two-piece design assists installation.� Manufactured from durable polypropylene.

Specification clauses

AR Arch TraysProvide dpcs tobrick/block arches overopenings usingpreformed purpose-made Glidevale AR ArchTrays with Stop Endsand Bed Weeps. Install inaccordance withmanufacturer’sinstructions.BE Bullseye WindowTraysProvide dpcs tobrick/block circular(bullseye) windows usingpreformed purpose-made Glidevale BEBullseye Window Trayswith Stop Ends and BedWeeps. Install inaccordance withmanufacturer’sinstructions.


AR Arch TrayProvides full dpc protection to arches constructed with temporary formwork.

Advantages� Enables traditional formwork construction methods.

� Design does not require tying in to the inner leaf of masonry.

� Purpose-made to rise, radius and shape required.

� Manufactured from durable polypropylene.

AR ARCH & BE BULLSEYE WINDOW TRAYS

Bed Weep

LTU Stop End

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OTHER APPLICATIONS: CHIMNEYS

CTHL Chimney Tray, High LevelRequired to prevent the entry of water athigh level where a chimney rises through apitched roof; suitable for new-build orremedial work. Minimises disturbance tosurrounding construction in remedial work.

Material: Lead sheet to BS EN 12588‘Specification for milled lead sheet forbuilding purposes’. Code 4 as standard,code 5 to special order.

Standard sizes: 800 x 800mm, 900 x 900mm, 950 x 950mm.

To suit either 195mm square or 195mmdiameter circular flue.Other sizes to special order.

Upstand to be cut on siteand folded down overflashing

CTLL Chimney Tray, Low LevelRequired at low level where a cavity-walledchimney with brick shoulders is built on toan external wall; the tray prevents waterwhich may enter the shoulders frompenetrating to the inner leaf of the wall.

Material: 1mm aluminium alloy sheet to BS EN 485-1+A1 ‘Aluminium andaluminium alloys. Sheet strip and plate.Mechanical properties’. This has a highermelting point than lead, so is suitable forinstallation close to a heat source.

Standard size: to suit 1115 x 510mmchimney. Other sizes to special order.

CT metal chimney trays protect againstwater penetration at high or low level.� Comply with Building Regulations andNHBC Standards, which require the useof metal trays in chimneys.

� Preformed components help to achieve ahigh standard of appearance.

� Eliminate the need for labour in formingunits on site.

� One-piece welded designs for speed ofinstallation.

� Maintain protection whilstaccommodating normal site inaccuracies.

Flashings by others

Note: Lead or aluminium sheet built into brickwork orconcrete as a damp proof course should beprotected with a thick coat of bitumen paint beforeinstallation.

21

OTHER APPLICATIONS: SECRET GUTTERS

ASG ABUTMENT SECRET GUTTER

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UseThe ASG Abutment Secret Gutter is for usewhere the sloping edge of a flat interlockingtiled roof abuts a wall. With flat tiles, there isa risk of water penetration by capillaryaction between the lead or otheroversoakers and the tiles, particularly onexposed sites or at low roof pitches.Because of this BS 8000: Part 6recommends the use of a secret gutter inthese conditions.

Care is required in the design of secretgutters; a 40mm gap is recommendedbetween the face of the abutment wall andthe tile edge to allow for cleaning out leaves and debris.

The ASG Abutment Secret Gutter should beused in conjunction with Glidevale IntraWeep Abutment Trays with factory-fittedflashings.

In sheltered situations use trays with shortflashings.

In exposed situations, use trays with longflashings secured by clips to act as a coverflashing.

Advantages� Preformed shape and light weightenables quick and easy installation.

� Reduces the risk of theft from site as theproduct is of no value to thieves.

� Positive 25mm upstand obviates theneed for capillary weather bars whichcause adjacent tiles to kick up.

� Complies with recommendations of BS 8000: Part 6.

� Designed in accordance with Lead SheetAssociation dimensional requirements.

� Resistant to UV light degradation.� Fire rating: designated AB to BS 476: Part 3.

� Pultruded GRP with additional surface gel coat.

� Comprehensive installation instructionsprovided.


ASG Abutment SecretGutterProvide abutment secretgutters to comply with BS 8000: Part 6. Gutters to be preformed Glidevale ASG AbutmentSecret Gutters with ABfire rating to BS 476: Part 3 . Install in accordance withmanufacturer’sinstructions.


ASG Abutment SecretGutter


Sheltered situationsIntra Weep AT Tray with factory-fitted short flashingdressed over gutterupstand

ASG Abutment SecretGutter

3000mm


roof underlay

50 x 50mm timbersupport

100 x 50mm rafter

100 x 50mm rafter

Exposed situations

Intra Weep AT Tray withfactory-fitted long flashingdressed over tiles

150mm minimum

50 x 50mm timbersupport


roof underlay

25mm

40mm

125mm

75mm

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LT Tray over window

Abutment cavity trays

Arch tray

Bullseye window trays

PT parapet tray

Chimney cavity trays

Horizontal cavity trays

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Environment / Operational InformationAs part of our commitment to minimisingour impact on the environment, and tocontinuous improvement in our methods ofoperation, Glidevale is accredited toISO14001 Environmental Management,OHSAS 18001 Health and SafetyManagement and ISO 9001 QualityManagement Systems.

Technical SupportGlidevale offer a full technical advisory andestimating service. Contact our TechnicalServices Department on 0161 905 5700 forfurther information or to request a completeschedule and quotation covering allproducts required.

Other ProductsGlidevale market a range of other productsincluding:

Ground floor gas and damp protectionproducts.

G Range tile and slate ventilators.

In-line tile and slate ventilators.

Abutment ventilation.

Loft access hatches/ladder.

iPSV® whole-house ventilation system.

910610 February 2018 4680

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GLIDEVALE2 Brooklands Road, Sale, Cheshire M33 3SS Tel: 0161 905 5700 Fax: 0161 905 2085Email: [email protected] Web: www.glidevale.com

Glidevale maintains a policy of continuous development and reserves the right to amend product specifications without notice.

A division of Building Product Design Ltd. Company Registration No; 3944123

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Stockist’s stamp

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REFERENCES

Building Regulations (England andWales)Protection against ground moisture and rainpenetration are required by the BuildingRegulations Part C for England and Wales.The relevant requirements are:

‘Resistance to moistureC2 The floors, walls and roof of the buildingshall adequately protect the building andpeople who use the building from harmfuleffects caused by:(a) ground moisture(b) precipitation and wind-driven spray.’

Similar requirements apply in other parts ofthe UK and Ireland.

The Building Standards TechnicalHandbook 2017Section 3.10 ‘Every building must bedesigned and constructed in such a waythat there will not be a threat to the buildingor the health of the occupants as a result ofmoisture from precipitation penetrating tothe inner face of the building.’

Republic of IrelandPart C Site preparation and resistance tomoisture 2004Document C4 ‘The floors, walls and roof ofa building shall be so designed andconstructed as to prevent the passage ofmoisture to the building or damage to thefabric of the building.’

Building Regulations (Northern Ireland)2012 Technical Booklet C

NHBCChapters 6.1, 6.2 and 7.2

ISO 9001 OHSAS 18001

glidevale cavity trays & preformed dpc's€¦ · uniclass pr_25_57_21_66 february 2018 a cavity...

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