durox aircrete blocks high performance for a faster build · bs en 771-4 certificate no. 00/3776...
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Benefits 1
Product selector 4
Durox Supabloc 5
Durox System 7
Durox Foundation 8
Durox Coursing bricks 10
Durox Floor 11
Durox Coursing slips 12
Application 13 Walls below DPC 13
Internal walls 13
Separating walls 13
Durox in flats 16
External walls 17
Thermal insulation 17
Code for Sustainable Homes 21
Design 27
Safe handling 27
Movement control 27
Mortar 27
Wall ties 28
Specification 28
contents
Benefits
Durox aircrete is a modern construction material, whose versatility and
light weight make it the ideal solution for a wide variety of applications in
all types of building. It can be used below ground in foundation walls, in
suspended beam and block floors and in all types of internal and external
walls. Its use provides many benefits for specifiers and users making it the
natural choice where blockwork is specified.
ExCEllEnT TECHnICal PErforManCE
• Duroxaircreteblockshavealow
thermal conductivity which aids
compliance with Part l Thermal
Standards as well as Code for
Sustainable Homes requirements.
Standard cavity widths of 75mm
can be built to meet U-values of
0.30 W/m2K or better.
• Duroxcanbeusedin
specifications to meet the
requirements of Part E Sound
Insulation for houses and flats,
including compliance with robust
Detail specifications.
• Theenvironmentalperformance
of Durox can help to achieve
compliance with the Code for
Sustainable Homes including
ratings in accordance with the
Green Guide to Specification.
• Compressivestrengthsof3.6,4.2,
7.3 and 8.7n/mm2 cover virtually
all structural needs and meet
Category 1 manufacturing
control requirements.
• Duroxcanbeusedwith
conventional or thin joint mortar
construction.
SaVE MonEY
• FasterDuroxbuild-timemeans
lower construction costs.
• Duetofewermortarjoints,
mortar savings up to 22% can
be made when compared to
conventional size blocks.
• ThelightnessofDuroxmeans
more blocks per load resulting in
lower transportation costs per m2
to site.
• Theexcellentthermalconductivity
of Durox can result in a reduction
in the amount of cavity insulation
required to meet U-values.
•Wallsbelowgroundconstructed
with Durox foundation blocks are
not only quick to build, but when
compared to conventional cavity
walls, their use avoids the cost of
forming cavities, concrete infill
and wall ties.
SaVE TIME
• At620mmlong,Duroxis40%
longer than conventional size
blocks meaning fewer units
to lay and less mortar to use.
Independently monitored trials
have demonstrated that Durox
Supabloc is over 20% faster to
build with than conventional size
aircrete blocks and over 30%
faster than dense blocks.
• Useofthinjointblockworkusing
Durox System can yield
exceptionally fast build times with
many other associated benefits.
1
Tarmac Topblock’s Durox System with thin
joint mortar helped Cambridge Housing
Society to construct a new development
of 6 residential properties in record time –
with exceptionally accurate and
cost-effective results.
Case study: Cambridge Housing society
WorKaBIlITY
•Duroxproductsareverygoodtowork
with as they are light, easy to handle
and quick to install.
•Theyareeasilycut,chasedand
fixed into.
•Theycanbefinishedwithrender,
cladding, plaster or drylining.
Durox System, thin joint blockwork, is
particularly suited to the application of
thin-coat spray plasters and renders.
EnVIronMEnTal & QUalITY
•Duroxismanufacturedundera
strictly controlled manufacturing
process supported by an
Environmental and Quality
Management System conforming to
ISO14001andISO9001respectively.
•Duroxblocksarerecyclableand
contain recycled material.
2
Sustainability
all Topblock manufacturing
plants operate an Environmental
Management System (EMS)
conformingtoISO:14001.Allsites
are independently certified for
compliance by BSI.
Use of Durox products supported
by a certified EMS provides the
evidence to comply with the
responsible Sourcing element of the
Code for Sustainable Homes. This
together with a responsible supply
chain allows Durox to contribute
in a number of ways towards
sustainable construction.
Summary Green Guide ratings
applicable to Durox constructions
can be found in the BrE Green
Guide to Specification.
Product Colour
Supabloc none
Supabloc4* Brown
Supabloc 7 Black
Supabloc 10 red
Notes *Theseblocksarefacemarkedwitha
zig-zag line on both working faces
(see below) to aid identification when
built into a separating wall.
all Durox products are BSI Kitemarked
toEN771-4,andaremanufactured
under a quality system complying
withISO9001.Duroxblocks
are Category 1 masonry units in
accordance with BS 5628-1. This
allows an enhanced partial safety
factor to be used for the material
strength in design calculations. Durox
floor is covered by British Board of
AgrémentCertificate(BBA)97/3371,
while all other Durox products are
covered by BBa Certificate 00/3776.
THE ProDUCTS
•DuroxSupabloc
•DuroxSystem
•DuroxFoundation
•DuroxCoursingbricks
•DuroxFloor
•DuroxCoursingslips
highest standards
BSEN771-4 CERTIFICATE No. 00/3776
appearance
Durox blocks have a white, medium
textured surface. Each product type is
supplied in shrink-wrapped packs for
protection and easy identification on
site. In addition high strength blocks are
colour coded on one perpend with paint
as shown below.
3
4
Durox product selector
Application
Cavity inner leaves, solid external walls and internal walls Durox Supabloc Durox Coursing bricks
Separatingwalls DuroxSupabloc4
Durox Supabloc 7
Higherstrengthloadbearingwalls DuroxSupabloc4
Durox Supabloc 7 Durox Coursing bricks
Durox Supabloc 10
620mm
215mm70mm
215mmWalls (standard mortar)
Application
Cavity inner leaves, solid external walls and internal walls Durox System 500 Durox System 500
Separating walls Durox System 600 Durox System 600
Higher strength loadbearing walls Durox System 700 Durox System 700
214mm
620mm
299mm
620mm
Walls (thin joint mortar)
Application
Beam and block floors Durox floor Durox Coursing slips
115mm215mm
100mm
530mm or 215mm 620mm
Floors
Application
Solid walls below DPC Durox foundation Durox foundation Durox foundation
Durox foundation 7 Durox foundation 7 Durox foundation 7
215mm
620mm280mm
or300mm
140mm
620mm280mm
or300mm
215mm
310mm350mm
Foundations
The Durox foundation range can support cavity walls above ground ranging from 280mm to 350mm width.
Durox Supabloc
Supablocs combine low unit weight
with high thermal insulation and
acoustic performance, in strengths of
3.6,4.2,7.3and8.7N/mm2.
Durox Supabloc is recommended for
general-purpose walling applications
including inner leaves, solid external
walls, internal partitions and walls
below DPC. They are particularly
suited for cavity and solid wall
construction that require low
U-values to be met. The use of
Supabloc will minimise the amount
of additional thermal insulation
required, compared to the use of
denser blocks.
DuroxSupabloc4isrecommended
for use in separating walls including
those conforming to robust Details
E-WM-6 and E-WM-15, as well as
other key applications such as the
rendered outer leaf of cavity walls,
and in loadbearing situations where a
4.2N/mm2 strength block is demanded.
Durox Supabloc 7 is suitable for more
demanding loadbearing applications
whilst retaining the characteristic low
unit weight of aircrete. It may also
be used in separating walls including
those conforming to robust Details
E-WM-6 and E-WM-15.
like all Durox products Supabloc
10 is produced to Category 1
manufacturing control as defined
in BS 5628-1. This can provide
an equivalent wall strength
toconventional10.4N/mm2
blocks produced to less rigorous
manufacturing control.
Size and unit weights
SUPABLOC
UnitWeight(kg) 1.6 4.4 6.3 7.3 7.9 8.8 9.5 12.6 13.6
laid Weight (kg/m2) 29 39 55 64 69 77 83 111 119
SUPABLOC 4 UnitWeight(kg) - - 8.7 10.0 - 12.1 13.0 17.4 18.6
laid Weight (kg/m2) - - 72 83 - 100 108 143 154
SUPABLOC 7
UnitWeight(kg) - - 9.3 10.7 11.7 13.1 14.0 18.6 20.1
laid Weight (kg/m2) - - 77 88 110 107 115 153 165
SUPABLOC 10
UnitWeight(kg) - - 9.9 - - 13.8 - - -
laid Weight (kg/m2) - - 80 - - 113 - - -
5
BLOCk WIDTH (mm)
50** 70 100 115 125 140 150 200 215
Notes **Workingsize=310x215mm (i) Unit and laid weights, which are given for design purposes, are approximate and calculated based on the specified dry density with a moisture content of 3% by weight added to provide equilibrium weights. (ii)DimensionaltolerancetoBSEN771-4:Length+3/-5mm,width+3/-3mm,height+3/-5mm.
6
FIre reSISTANCe, NO FINISH (HOUrS) 1 2 4
SUPABLOC: mINImUm WIDTH (mm)
loadbearing 100 125 150
non-loadbearing 70 70 150
SUPABLOC 4, 7 Or 10: mINImUm WIDTH (mm)
loadbearing 100 100 150
non-loadbearing 100 100 100
fire resistance of walls – single leaf wall
fireDurox blocks provide excellent periods of fire resistance which can satisfy building regulations and other imposed requirements e.g. insurers.
all Durox products conform to a fire rating of Class a1 to BS En 13501-1:2002.
Typical fire resistance values for Durox constructions are shown and are based on the UK national annex to Eurocode 6: Design of masonry structures (Part 1-2).
Sound insulationDurox blocks may be used to provide acoustic insulation between internal rooms. The Building regulations approved Document E requires certain internal walls and floors in dwellings to meet a performancestandardof40R
w dB.
This can be met, for example, using 100mm Supabloc finished with plaster or drylining. Sound reduction values of other Durox products are shown in the table opposite.
for further advice including use in seperating wall constructions, please refer to page 13.
Durox Supabloc
Sound reduction values – single leaf wall
Notes (i) finishes to both wall faces are assumed.
(ii)ValuesarebasedontechnicalassessmentandteststoBSEN140.
Finish No Lightweight Drylining finish plaster
SUPABLOC: WeIgHTeD SOUND reDUCTION INDex, rw dB
100mm 38 41 40
140mm 41 43 43
215mm 46 48 48
SUPABLOC 4: WeIgHTeD SOUND reDUCTION INDex, rw dB
100mm 40 41 42
140mm 44 46 46
215mm 49 50 50
SUPABLOC 7 & 10: WeIgHTeD SOUND reDUCTION INDex, rw dB
100mm 41 44 43
140mm 45 47 47
215mm 50 51 51
Technical properties
SUPABLOC SUPABLOC 4 SUPABLOC 7 SUPABLOC 10
FACe SIZe (mm)
620 x 215 for all products
meAN COmPreSSIve STreNgTH TO BS eN 771-4 (N/mm2)
3.6 4.2 7.3 8.7
mATerIAL Dry DeNSITy (kg/m3)
460 630 680 720
THermAL CONDUCTIvITy (W/mk) @ 3% mOISTUre CONTeNT
0.11 0.16 0.19 0.19
reACTION TO FIre Class a1 for all products
TyPICAL PrODUCT AIr TIgHTNeSS (m3/(hr/m2)@ 50 Pa) 0.12 for all products
Durox System
System is a fast-build method
that allows rapid construction of
blockwork – offering the potential
for better construction and enabling
early commencement of the
finishing trades. System comprises
dimensionally accurate 620mm long
Durox blocks for use with quick
setting thin-layer mortar.
application
Manufactured in a range of
strengths and coursing heights,
System may be used for solid,
inner leaf and partition walls in
all types of buildings. System is
particularly suitable for housing and
commercial projects where long
runs of blockwork yield maximum
productivity gains.
System 600 or 700 may be used
in cavity separating walls built to
robust Details E-WM-10 and
E-WM-13. for further details refer
to the Durox System brochure.
SySTem SySTem SySTem
500 600 700
meAN COmPreSSIve STreNgTH TO BS eN 771-4 (N/mm2)
3.6 4.2 7.3
mATerIAL Dry DeNSITy (kg/m3)
460 630 680
THermAL CONDUCTIvITy (W/mk) @ 3% mOISTUre CONTeNT
0.11 0.16 0.19
reACTION TO FIre Class a1 for all products
TyPICAL PrODUCT AIrTIgHTNeSS (m3/hr/m2 @ 50 Pa) 0.12 for all products
Technical properties
BLOCk WIDTH (mm)
100 125 140 200 215 SySTem 500 coursing heights
214mm 6.3* 7.7 8.8 12.6* 13.5
299mm 8.8* 11.0 12.3 - 18.9
SySTem 600 coursing heights
214mm 8.6 10.8 12.1 - 18.5
299mm 12.1 15.1 16.8 - -
SySTem 700 coursing heights
214mm 9.3 - 13.0 18.5 -
299mm 13.0 - 18.2 - -
Size and unit weights (kg)
Notes (i) Unit weights are approximate
and calculated based on the specified dry density with a moisture content of 3% by weight added to provide
equilibrium weights.
(ii) TolerancetoBSEN771-4:
Height+2/-2mm.
(iii)*Stockitems.Othersizes
normally available within
3 weeks, subject to minimum
quantities.
7
8
Durox foundation
foundation blocks are produced specifically for use below DPC in solid walls. Its use replaces the inner and outer leaf, wall ties and concrete cavity fill associated with traditional build methods. Construction time can be halved compared to cavity construction and the foundation wall becomes stable soon after laying, allowing the early start of above ground work.
In response to increasing standards of energy efficiency, Durox foundation blocks 350mm x 310mm x 215mm have been introduced. These blocks can accommodate cavity walls above ground of up to 350mm width whilst maintaining a conventional block bedding height.
applicationsfoundation can be used to support cavity, solid walls or frame constructions.
Because of its excellent insulating properties, the product contributes towards the perimeter insulation of ground floors. See page 20 for typical U-values.
Durox foundation (3.6 n/mm2) is suitable for use in Class DS-1 and DS-2
sulfate soil conditions and foundation (7.3 n/mm2) is suitable for use in Class DS-1 to DS-3 sulfate soil conditions as confirmed by British Board of agrément Certificate no. 00/3776.
The appropriate thickness of Durox foundation should be selected to suit the width of cavity or solid wall that requires supporting above DPC.
Installationfor below ground use (excluding work in retaining or basement walls), foundation blocks can be used with unfilled vertical joints, provided the blocks are built with their ends closely butted together to restrict the passage of vermin. This advice is consistent with the guidance given in BrE information paper IP7/05. The blockwork should be set out to achieve adequate block bonding at corners. a typical solution is shown below.
Durox Foundation blocks below DPC
Durox foundation
Insulation
DPC
Screed
Corner bonding of Tarmac foundation Wall 310mm width
125mm
310mm
125mm
9
Technical properties
FOUNDATION
meAN COmPreSSIve STreNgTH TO BS eN 771-4 (N/mm2)
3.6 7.3
mATerIAL Dry DeNSITy (kg/m3)
460 680
THermAL CONDUCTIvITy (W/mk) @ 3% mOISTUre CONTeNT
0.11 0.19
Block width (mm)
Foundation 3.6 N/mm2 280 300 310 350 280 300
UnitWeight(kg) 17.7 19.0 11.1 11.1 11.5 12.3
laid Weight (kg/m2) 155 166 177 200 163 175
Foundation 7.3 N/mm2
UnitWeight(kg) 26.2 28.0 16.4 16.4 17.0 18.3
laid Weight (kg/m2) 214 229 242 273 221 237
No. of blocks required per m2 of wall 7.1 7.1 12.3 13.9 10.6 10.6
Notes (i) Unit and laid weights, which are given for design purposes, are approximate and calculated based on the specified dry density with a
moisture content of 3% by weight added to provide equilibrium weights.
(ii) The calculation of number of blocks per m² of wall assumes all joints are filled with mortar.
Size and unit weights (kg)
215mm
620mm280mm
or300mm
140mm
620mm
280mmor
300mm
215mm
310mm350mm
10
Durox Coursing bricks
Coursing bricks are designed for
use with the range of Durox blocks
and should be used to avoid thermal
bridging and minimise wastage.
application
Durox Coursing bricks should be
used for general coursing work,
in-filling small areas of wall such
as between timber floor or roof
members as well as closing cavities at
eaves, reveals and sills. Their use will
eliminate cutting and wastage.
Typical application
BrICk WIDTH (mm) 100 115 125 140 150* BrICk: (3.6 N/mm2) - Unit weight (kg)
0.71 0.82 0.89 1.00 1.07
BrICk: (7.3 N/mm2) - Unit weight (kg)
1.05 1.21 1.32 1.47 1.58
Size and unit weights
Notes Unit and laid weights, which are given for design purposes, are approximate and based
on 3% moisture content.
*Specialrange-notavailablefromstock.
Technical properties
70mm
215mmWidth
BrICkS
FACe SIZe (mm)
215 x 70 for all products
meAN COmPreSSIve STreNgTH TO BS eN 771-4 (N/mm2)
3.6 7.3
mATerIAL Dry DeNSITy (kg/m3)
460 680
THermAL CONDUCTIvITy (W/mk) @ 3% mOISTUre CONTeNT
0.11 0.19
reACTION TO FIre
Class a1 for all products
11
Durox floor
Durox floor blocks
floor blocks are suitable for use in
suspended floors in conjunction with
precast concrete beams.
They are light and quick to install, and
provide effective sound and thermal
insulation for ground and internal
floors meeting the requirements of the
Building regulations.
The use of Durox floor blocks can
achieve economy in the overall design
of the floor. firstly by a reduced dead
load, secondly the size of the block
allows much more flexibility in beam
spacing allowing fewer beams to be
used.
applications
Durox floor blocks are suitable for
use in beam and block suspended
ground and internal floors in single
occupancy dwellings under domestic
loading. Where high point loading
is anticipated, such as in garages, a
reinforced structural topping must be
used. Where the floor loading
dictates closer beam spacing a
620 x 215 x 100mm Durox Supabloc
block should be used, spanning its
215mm dimension only.
Coursing slips to in-fill between
beam-endsareavailableina40mm
bedding height. for 175mm deep
beams Durox Coursing bricks are
available.
The requirements of Building
regulation E2 ‘Protection against
sound within a dwelling house’ can
be easily met using a beam and
block internal floor finished with a
minimum 50mm sand and cement
screed and plasterboard ceiling. Tests
commissioned by the aircrete Products
association confirm that the airborne
sound reduction (rw) for this floor
construction is 51 rw dB. This exceeds
theminimumrequiredvalueof40Rw
dB.
Transverse load
The blocks have been tested at a
530mm and 620mm clear span
to sustain a point load of 3.5Kn
transferred via a 100mm x 100mm
steel plate.
Thermal Insulation
The use of Durox floor blocks will
reduce the amount of ground floor
insulation needed compared to the
use of denser floor blocks. This will
be further improved when used in
combination with Durox foundation
blocks. for examples refer to
page 20 or view on
www.tarmac.co.uk/topblock
FLOOr
meAN COmPreSSIve STreNgTH TO BS eN 771-4 (N/mm2)
3.6
mATerIAL Dry DeNSITy (kg/m3)
460
THermAL CONDUCTIvITy (W/mk) @ 3% mOISTUre CONTeNT
0.11
TrANSverSe STreNgTH (kN) mIN
3.5
reACTION TO FIre
Class a1
Technical properties
LeNgTH x WIDTH (mm) 620 x 530 620 x 215*
THICkNeSS (mm) 100 100
FLOOr
15.6 6.3
Size and unit weights (kg)
Notes Unit and laid weights, which are given for design purposes, are approximate and based
on 3% moisture content.
*AvailableasSupablocandlaidat215mmspan.
Durox Coursing slips
Durox Coursing slips
Coursing slips are specifically
manufactured for use in
combination with floor blocks.
They can be used beneath floor
blocks at the bearings where the
floor block bears directly on to
the inner leaf or an internal wall.
They eliminate thermal bridging
by providing continuity of thermal
insulation. In addition the use of
Coursing slips minimises the need
for labour intensive cutting and
reduces wastage. Coursing slips are
supplied in packs of 600.
Technical properties
40mm
115mm215mm COUrSINg SLIPS
SIZe (mm)
215x40x115
meAN COmPreSSIve STreNgTH TO BS eN 771-4 (N/mm2)
3.6
mATerIAL Dry DeNSITy (kg/m3)
460
UNIT WeIgHT (kg)
0.5
THermAL CONDUCTIvITy (W/mk) @ 3% mOISTUre CONTeNT
0.11
reACTION TO FIre
Class a1 for all products
12
13
Technical properties
Walls below DPC
Durox products can be used to
construct walls below ground.
They can be used in sulfate soil
conditions as shown in the table
below and as confirmed by British
Board of agrément Certificate
no. 00/3776. In addition they
are resistant to the freeze / thaw
conditions likely to occur below
the DPC, as confirmed by tests to
MoaT 12.
Durox foundation blocks should be
specified to construct 280-350mm
solid walls below ground. They are
intended to support cavity or solid
walls of equivalent thickness above
ground. all Durox Supabloc products
can be used to construct internal and
external walls below ground.
Internal walls
any grade of Durox can be used
for the construction of internal
walls. for partitions in dwellings
these products can be used to
provide good levels of airborne
sound insulation as well as a suitable
background for finishes
and for fixings.
for commercial and industrial
applications Durox may be used
to provide sound insulation, fire
resistance and structural strength.
Certain internal walls are required to
provide a level of sound insulation as
required by the Building regulations
E2. Walls between bedrooms, or
a room containing a water closet,
and other rooms, need to provide
the minimum sound insulation of
40Rw dB. The constructions on
page 15 have been assessed and /
or laboratory tested to demonstrate
the performance level required by
approved Document E.
Durox application
Sulfate soil conditions
DUrOx AIrCreTe BLOCkS
DS-1 DS-2 DS-3
Durox foundation (3.6n/mm2) 3 3
Durox Supabloc 3 3
DuroxSupabloc4 3 3 3
Durox Supabloc 7 3 3 3
Durox Supabloc 10 3 3 3
Separating walls
The Building regulations require
separating walls to provide
reasonable resistance to sound
transmission.
Guidance on suitable Durox
constructions capable of meeting
the specified performance is shown
onpages14-16.Thisincludes
constructions that can be built
to satisfy new robust Details E-WM-6,
E-WM-10, E-WM-13 and E-WM-15.
The use of robust Details provides
an alternative to pre-completion
testing for demonstrating
compliance with Part E for new build
dwellings. robust Details should be
used in accordance
with the scheme requirements
including plot registration.
The performance of separating
walls is highly dependent on the
design and detailing of the
associated flanking construction.
further guidance is given in the
Topblock Design Guide.
14
Durox application
new Dwellings - Pre-completion testing
CONSTrUCTION eLemeNTS meTHODS OF COmPLIANCe reCOmmeNDeD SOLUTION
Separating walls Constructions requiring
pre-completion testing in
accordance with approved
Document E or other technical
guidance e.g. BBa certification
or field test data
Note Durox System 600/700 is thin jointed blockwork using a 2-3mm bed joint.
Site testing
required
13mm plaster (10kg/m2 min) 75mm min cavity
•2x100mmDuroxSupabloc4or7or10•2x100mmDuroxSystem 600 or 700
new Dwellings - robust Details
CONSTrUCTION eLemeNTS meTHODS OF COmPLIANCe rD reF reCOmmeNDeD SOLUTION
Separating walls robust Details E-WM-6
Pre-completion testing or
not required E-WM-10 or
E-WM-13
or
E-WM-15
rD - No Site testing
required
e-WM-6 (conventional mortar)•2x100mmDuroxSupabloc4,7 or 10 minimum 75mm cavity, plasterboard (nominal 8Kg/m2) on dabs on cement/sand render with scratch finish
e-WM-10 (thin joint mortar)•2x100mmDuroxSystem600or 700 minimum 75mm cavity (usingAnconStaifixHRT4wallties),plasterboard (nominal 8Kg/m2) on dabs on cement/sand render with scratch finish
e-WM-13 (thin joint mortar)•2x100mmDuroxSystem600or700 minimum 75mm cavity (built without wall ties) plasterboard (nominal 8Kg/m2) on dabs on cement/sand render with scratch finish
e-WM-15 (conventional mortar)•2x100mmDuroxSupabloc4,7 or 10 minimum 75mm cavity incorporating 35mm Saint Gobain Isover rD35 acoustic batt, plasterboard (nominal9.8kg/m2) on dabs
75mm min cavity
Drylining
Note *DuroxSystem600/700isthinjointedblockworkusinga2-3mmbedjoint.E-WM-13separatingwallsshouldbebuiltwithoutwallties.
15
Note Durox System 500/600/700 is thin jointed blockwork using a 2-3mm bed joint.
new Build Dwellings and Extensions
CONSTrUCTION eLemeNTS meTHODS OF COmPLIANCe reCOmmeNDeD SOLUTION
Internal Walls approved Document ‘E’ prescriptive
solutions or Topblock constructions
which have been shown by testing
to meet the regulations
Internal floors approved Document ‘E’ prescriptive
solutions or Topblock constructions
which have been shown by testing
to meet the regulations
Wall blocks comprising•100mmDuroxSupabloc•100mmDuroxSupabloc4,7or10•100mmDuroxSystem500,600or700
Infill blocks comprising•100mmDuroxFloor
Plaster or drylining
50mm min sand/cement screed
any ceiling finish
No Site testing
required
CONSTrUCTION eLemeNTS meTHODS OF COmPLIANCe reCOmmeNDeD SOLUTION
Separating Walls Constructions requiring
pre-completion testing in
accordance with approved
Document E or other technical
guidance e.g. BBa certification
or field test data
Note *Roomsforresidentialpurposesincludehotels,hostels,boardinghouses,hallsofresidenceandresidentialhousesbutexcludehospitalsorsimilarestablishments used for patient accommodation.
•215mmDuroxSupabloc4or7or10•215mmDuroxSystem600
13mm plaster (10kg/m2 min)
13mm plaster (10kg/m2 min)
215mm
Site testing
required
NewBuildRoomsforResidentialPurposes*any of the recommended solutions shown for the new Build Dwellings (above) can be specified for separating walls for use in rooms for residential purpose. In addition the solutions shown below may be used:
16
Durox in flats
Durox can be used to construct
flanking and separating walls based
on robust Detail specifications.
Separating walls
The robust Detail handbook
descibes aircrete separating wall
specifications including E-WM-6,
E-WM-10 and E-WM-15. This
confirms that aircrete can perform
as well as higher density aggregate
block constructions. as a result of
this Table 3 of the robust Details
handbook allows Durox cavity
separating walls to be used in
combination with the separating
floorconstructionE-FC-4.This
allows Durox blocks to be used in
both the flanking and seperating
walls without the need for
pre-completion testing. other Durox
specifications can be used
eg. E-WM-10 in conjunction with
separating floors but the floor only
will be subject to pre-completion
testing. The table below shows
the requirements. Work continues
in developing additional Durox
specifications through the robust
Details programme and it is
advisable to refer to Topblock
Technical Services or our web site
www.tarmac.co.uk/topblock for the
most up-to-date specifications.
Durox application
Masonry outer leaf
External wall cavity (min 50mm)
Inner leaf (min 100mm) using Durox Supabloc
Supabloc4orSupabloc7
IsoEdge flanking strip
Isorubber resilient layer
flexible cavity stop unless it is fully filled with build in mineral wool insulation
Tarmac Hollowcore or similar
nominal 8kg/m2 gypsum-based board or 13mm plaster
External(flanking)walljunctioninconjunctionwithRobustDetailfloorE-FC-4
N.B. Consult robust Details Handbook for full specification
flanking walls
Durox can be used for the inner
leaf of the external walls in
accordance with robust Detail
E-FC-4withouttheneedto
undertake routine
pre-completion testing. for this
application Durox Supabloc,
Supabloc4,7or10ofminimum
100mm thickness can be used.
at least one storey of the
separating wall flanking the
separating floor should be built
with Supabloc 7 blockwork.
E-WM-15 (Conventional mortar) Supabloc4,7&10
Supabloc, Supabloc4,7&10
E-FC-4*
Durox separating & flanking walls in flats
*InaccordancewithTable3oftheRobustDetailshandbooktheseseparatingfloorsrequire pre-completion testing.
rD ref noDurox Blocks
2 x 100mm with 75mm cavity
Durox inner leaf 100mm min
rD ref no
FLANkINg WALLrOBUST DeTAIL
SePArATINg FLOOrrOBUST DeTAIL
SePArATINg WALL
E-WM-10(Thin layer mortar -
ancon Staifix wall ties)System 600 & 700
System 500, 600 & 700
E-FC-4*
E-WM-6 (Conventional mortar) Supabloc4,7&10
Supabloc, Supabloc4,7&10
E-FC-4
Thermal insulation
Some typical construction details
to comply with Building regulation
Part l as well as the energy
requirements of the Code for
Sustainable Homes, are shown
on pages 18 - 20. as insulation
material sizes and their thermal
conductivity are subject to change
it is recommended that the U-value
of constructions be periodically
confirmed by reference to Technical
Services or the Tarmac Website.
approved Document l1a,
(new dwellings) of the Building
regulations, requires compliance to
be demonstrated by showing that
the Dwelling Emission rate (DEr) is
no greater than the Target Emission
rate (TEr) of a notional building
of the same size as the proposed
house. The TEr is calculated using
standard defaults for the fabric
insulation and the heating and hot
water systems that are embedded
within the SaP software, resulting
in a 20% reduction in Co2
emissions compared to the previous
requirements.
17
Durox application
Notes AnygradeofDuroxincludesSupabloc,Supabloc4orSupabloc7.ForadviceonDuroxSystemorsolidwallscontacttechnicalservices.
External walls Durox blocks may be used to
construct cavity and solid external
walls. for cavity construction the
minimum leaf thickness will normally
be90mm.Duroxblocksaresuitable
for a range of external finishes as
shown in the table below.
In a single leaf wall the minimum
thickness of Durox, with or without
rendering, may be selected from BS
5628-3.
any external cladding material such as timber boarding or hanging tiles on battens
Two coats of designation (iii) sand/cement render
Two coats of designation (iii) sand/cement render
Two coats of designation (iii) sand/cement render
facing brick
Both leaves may be any grade of Durox block. additional insulation may be required
The inner leaf may be any grade of Durox block. The outer leaf should be a DuroxSupabloc4or7
The inner leaf may be any grade of Durox block. The outer leaf should be a DuroxSupabloc4or7
The inner leaf may be any grade of Durox block. The outer leaf should be a Topblock Hemelite or Topcrete block
The inner leaf may be any grade of Durox
Clear cavity, Partial cavity fill, full fill
Clear cavity
Partial cavity fill
full fill
Clear cavity, Partial cavity fill, full fill
exTerNAL FINISH CAvITy WALL CONSTrUCTION COmmeNTS
Guidance for the use of Durox in external cavity walls
18
Durox application
Thermal insulation (continued)
The actual level of fabric insulation
required will be dependant upon
a number of factors including the
fuel type used and the efficiency of
the heating system. The diagram
below shows typical U-values for the
exposed elements of the building,
assuming that the fuel type is mains
gas, which could form the starting
point for the DEr calculation.
lower U-values may be required
when meeting more stringent energy
requirements. This may include
compliance with various levels of the
Code for Sustainable Homes.
approved Document l1B covers
the standard of insulation required
when building work is carried out
on an existing dwelling. When
constructing an extension to a
dwelling minimum elemental
U-values apply as shown in the
table below.Elemental U-values for extensions to existing dwellings
eLemeNT DWeLLINgS U-vALUe (W/m2k)
Walls 0.30
floor 0.22
roof insulation at ceiling level 0.16
roofs insulation at rafter level 0.20
roofs (flat) 0.25
Windows roof windows & rooflights 1.80
Doors with more than 50% of internal face glazed 2.20
other doors 3.00
Note † Similar materials include Celotex, xtratherm etc.
Note Thermal laminates are assumed to be fixed using adhesive tabs.
U-values using partial fill insulation and 100mm Durox
Insulation
40mmKingspanTW50or similar†
INTerNAL FINISH U-vALUe (W/m2k)
SUPABLOC SUPABLOC 4 SUPABLOC 7
13mmLightweightplaster 0.29 0.30 0.31
12.5mmPlasterboardondabs 0.28 0.29 0.30
13mm lightweight plaster 0.25 0.27 0.27
12.5mm Plasterboard on dabs 0.25 0.26 0.27
13mmLightweightplaster 0.24 0.26 0.26
12.5mmPlasterboardondabs 0.24 0.25 0.26
13mmLightweightplaster 0.22 0.23 0.24
12.5mm Plasterboard on dabs 0.22 0.23 0.23
60mm Kingspan TW50or similar†
70mm Kingspan TW50or similar†
50mm Kingspan TW50or similar†
INTerNAL FINISH U-vALUe (W/m2k)
THermAL LAmINATe SUPABLOC SUPABLOC 4 SUPABLOC 7
60mmThermaLineSuper(R-value=2.32m2K/W) 0.27 0.29 0.30
65mmThermaLineSuper(R-value=2.55m2K/W) 0.26 0.27 0.28
U-values using clear cavity with thermal laminates and 100mm Durox
The following U-value examples are based on the use of Durox Supabloc. for U-values of Durox thin joint blockwork please refer to the respective brochure. Typical proprietary insulation materials are shown but alternative insulation products may be used providing they can achieve equivalent thermal resistance.
roof window or rooflightsU-value=0.30W/m2K
Exposed wallsU-value=0.30W/m2K
Windows and doorsU-value=1.8W/m2K
roof with ceilingU-value=0.14W/m2K
Ground floorU-value=0.20W/m2K
Gas boiler with a minimum Sedbukof 86%
19
Durox application
U-values using full fill insulation and 100mm Durox
Insulation
75mm Crown Dritherm 32or Isover Hi-Cav 32
Note PIr is polyisocyanurate insulation.
85mm Crown Dritherm 32or Isover Hi-Cav 32
100mm Crown Dritherm 32or Isover Hi-Cav 32
85mmCrownDritherm34
100mmCrownDritherm34
80mm Springvale PlatinumEcobead
INTerNAL FINISH U-vALUe (W/m2k)
SUPABLOC SUPABLOC 4 SUPABLOC 7
13mmLightweightplaster 0.29 0.31 0.31
12.5mm Plasterboard on dabs 0.28 0.30 0.30
13mmLightweightplaster 0.27 0.29 0.29
12.5mmPlasterboardondabs 0.27 0.28 0.29
13mmLightweightplaster 0.24 0.26 0.26
12.5mmPlasterboardondabs 0.24 0.25 0.26
13mmLightweightplaster 0.28 0.29 0.30
12.5mmPlasterboardondabs 0.27 0.28 0.29
13mm lightweight plaster 0.25 0.27 0.27
12.5mm Plasterboard on dabs 0.25 0.26 0.27
13mm lightweight plaster 0.28 0.30 0.31
12.5mmPlasterboardondabs 0.27 0.29 0.30
13mmLightweightplaster 0.24 0.25 0.26
12.5mmPlasterboardondabs 0.24 0.25 0.25
13mm lightweight plaster 0.22 0.23 0.23
12.5mm Plasterboard on dabs 0.21 0.22 0.23
13mm lightweight plaster 0.22 0.23 0.23
12.5mm Plasterboard on dabs 0.21 0.22 0.22
100mm Springvale PlatinumEcobead
125mm Crown Dritherm 32 or Isover Hi-Cav 32
125mm Springvale PlatinumEcobead
Solid Walls using 215mm Durox
exTerNAL FINISH
20mm render
TileHanging+40mmPIR(λ=0.023W/mK)insulationlaid between vertical battens at400mmcentres
INTerNAL FINISH U-vALUe (W/m2k)
SUPABLOC SUPABLOC 4 SUPABLOC 7
50mm Thermaline Super 0.27 0.31 0.32
60mmThermaLineSuper 0.24 0.26 0.28
65mm Thermaline Super 0.23 0.25 0.26
12.5mm Plasterboard on dabs 0.30 0.35 0.37
12.5mm Plasterboard on dabs 0.27 0.31 0.33
12.5mmPlasterboardondabs 0.21 0.23 0.24
TileHanging+50mmPIR(λ=0.023W/mK)insulationlaid between vertical battens at400mmcentres
10mmRender+100mmExternal Insulation (λ=0.033)
20
Durox application
Notes (i) floor beams are assumed at 620mm centres. (ii) Some thicknesses of insulation are achieved by combining one or more layers to obtain the overall thickness. (iii) floors finished with (minimum) 50mm screed or chipboard.
FLOOr BLOCk INSULATION TyPe INSULATION THICkNeSS (mm)
P/A rATIO 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Durox Jabfloor 70 20 80 100 110 115 120 125 130 130 130
Durox PolyfoamFloorboard220 15 65 90 100 105 110 110 115 115 120
Durox Celotex Ga 3000 15 50 60 65 70 75 75 80 80 80
Beam & Durox floor block ground floor to achieve U-value 0.20 (W/m2K) or better
Notes (i) floor beams are assumed at 620mm centres. (ii) Some thicknesses of insulation are achieved by combining one or more layers to obtain the overall thickness. (iii) floors finished with (minimum) 50mm screed or chipboard.
FLOOr BLOCk INSULATION TyPe INSULATION THICkNeSS (mm)
P/A rATIO 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Durox Jabfloor70 90 140 150 - - - - - - -
Durox PolyfoamFloorboard220 75 125 140 150 - - - - - -
Durox CelotexGA3000 55 85 95 105 110 110 115 115 115 115
Beam & Durox floor block ground floor to achieve U-value 0.15 (W/m2K) or better
Notes (i) floor beams are assumed at 620mm centres. (ii) Some widths of insulation are achieved by combining one or more layers to obtain the overall thickness. (iii) Includes 2 courses of foundation blocks below ground level. (iv) floors finished with (minimum) 50mm screed or chipboard.
FLOOr BLOCk INSULATION TyPe INSULATION THICkNeSS (mm)
P/A rATIO 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Durox Jabfloor70 10 70 90 105 110 115 120 120 125 125
Durox PolyfoamFloorboard220 10 50 80 90 100 105 105 110 110 115
Durox CelotexGA3000 10 40 55 65 65 70 75 75 75 75
Beam & Durox floor block ground floor with Durox foundation blocks to achieve U-value 0.20 (W/m2K) or better
Durox application
21
Code for Sustainable Homes
The Code for Sustainable Homes identifies9keycategoriesofsustainable performance. Durox products can contribute towards the required performance as shown.
Energy and Co2
Category 1 of the Code is essentially divided into mandatory requirements Ene 1 and optional requirementsEne2toEne9.
1.The Dwelling emission rate (Ene 1) is mandatory and awards credits for the Co2 emissions of the dwelling being below the standard set by the Building regulations approved Document l1a (2006 edition). Durox products will contribute towards the U-value of the external elements such as external walls, ground floors and foundation walls thereby reducing the dwellings Co2 emissions. Whilst there is a minimum standard to be met at each Code level additional, optional credits can be gained by reducing the dwellings Co2 emissions below the level set for each Code level.
2.Building fabric (Ene 2) is optional and requires that the Heat loss Parameter (HlP) of each dwelling meets set criteria. The HlP is a measure of the overall thermal performance of the home taking into account fabric and ventilation losses. Durox constructions can be used to help achieve a HlP less than or equal to 1.1 to obtain the maximum credits available.
Ene3to9dealwithotheroptional energy use aspects such as daylighting, drying spaces and renewable energy etc.
Environmental Impact of Materials – Mat 1
This section of the Code recognises the importance of accounting for the environmental impact of building materials and encourages designers to consider the type of construction they specify. Mat 1 is mandatory and has a single minimum standard at all Code levels. By careful selection of the main elements additional credits can be obtained over and above the minimum standard.
The credits awarded are based on BrE Green Guide 2008 ratings of construction elements.
Minimum Standard
The minimum standard at all Code levels is for at least three of the following 5 key elements of construction to achieve a Green Guide rating of at least D
- roof- External walls- Upper floors- Internal walls- Windows and doors
Durox construction can be used to external walls, upper floors (beam and block) and internal walls to meet the minimum standards.
Enhanced Performance
Based on the Green Guide 2008, Durox aircrete constructions can be used to maximise the ‘points’ available and hence contribute towards the required Code level.
green guide rating Score
A+ 3
a 2
B 1
C 0.5
D 0.25
Green Guide ratings
Environmental ratings for a number of Durox aircrete constructions are based on BrE’s Green Guide 2008 ratings. The ratings presented are only a selection of the aircrete constructions available.
The ratings are correct at the time of going to press, but these may be subject to change as constructions are amended or new ones introduced. Please check ratings with our Technical Services team or view current ratings on the BrE web site www.thegreenguide.org.uk.
22
External walls
The ratings for external walls are applicable to all building types using any type of Durox block.
element Summary
number rating
Brickworkouterleaf,insulation,aircreteblockworkinnerleaf, 806170028 A+
cement mortar, plaster, paint
Brickworkouterleaf,insulation,aircreteblockworkinnerleaf, 806170615 A+
cement mortar, plasterboard on battens, paint
Brickworkouterleaf,insulation,aircreteblockworkinnerleaf, 806170061 A+
cement: lime mortar, plaster, paint
Brickworkouterleaf,insulation,aircreteblockworkinnerleaf, 806170065 A+
cement: lime mortar, plasterboard on battens, paint
Internal walls
The ratings for internal walls are applicable to domestic, commercial and health buildings using any type of Durox block.
Aircreteblockworkwithcement:limemortar, 809180034 A
plaster, paint
Aircreteblockworkwithcement:limemortar, 809180015 B
plasterboard, paint
Aircreteblockworkwithplaster,paint 809180021 A
element Summary
number rating
Aircreteblockworkwithcement:limemortar, 809180038 A+
painted finish only
23
Internal walls cont’d
Aircreteblockworkwiththinjointmortar,plaster,paint 809180022 A
Aircreteblockworkwiththinjointmortar, 809180050 B
plasterboard, paint
Aircreteblockwork,paintedfinishonly 809180037 A+
Aircreteblockwork,plasterboard,paint 809180003 B
element Summary
number rating
Ground floors
The ratings for external walls are applicable to domestic building types using Durox floor block.
element Summary
number rating
Chipboard(P5)deckingontimberbattenswithinsulation, 820140019 A+
on grouted beam and aircrete block flooring
Plywood(temperate,EN636-2)deckingontimberbattens 820140026 A
with insulation, on grouted beam and aircrete
block flooring
Screedoninsulationlaidongroutedbeamand 820140014 B
aircrete block flooring
should check with Technical Services for an update on our position on responsible sourcing.
Sound Insulation – Hea 2
Category 7 of the Code covers health and wellbeing issues including sound insulation.
This aspect is intended to promote improved sound insulation of separating elements to reduce the incidence of noise complaints from neighbours.
Significant progress has been made in developing reliable separating
wall and floor constructions since the 2003 amendments to Part E1 of the Building regulations. This has allowed Tarmac to acquire significant knowledge into the constructions that can meet and surpass the minimum standards required by Building regulations.
Credits are awarded depending on the level of sound insulation achieved for separating walls and separating floors (where applicable) above the performance specified in the Building regulations, approved Document E (2003 Edition). The required performance is shown.
Criteria for higher standards of sound insulation
The specified level of performance can be demonstrated by:a) pre-completion testing in accordance with approved Document E, orb) using constructions that have been confirmed by robust Details limited as being capable of meeting the level of performance required.
Through the robust Details programme a number of separating walls can be built with our products to achieveenhanced levels of performance as shown in the following tables.
Improvement over Building regulations Credits
Airborne sound Impact sound
3 dB higher 3 dB lower 1
5 dB higher 5 dB lower 3
8dBhigher 8dBlower 4
24
Notes These criteria are assessed at the building envelope level.
This aspect is intended to encourage the specification of responsibly sourced materials for the basic building elements such as external walls and floors.
responsible sourcing was an issue originally attributed to imported timber and the consequences including social conditions that arise from illegal logging. although the focus has long been on timber, the Code now requires all basic materials to be considered.Credits are awarded based on the use of materials in key building elements as shown.
responsible Sourcing of Materials (Basic Building Elements) – Mat 2
Criteria
Credits
Where 80% of the assessed materials in the following 1-6
Building Elements are responsibly sourced:
a) frame
b) Ground floor
c) Upper floors (including separating floors)
d) roof
e) External walls
f) Internal walls (including separating walls)
g) foundation/substructure (excluding sub-based materials)
h) Staircase
additionally, 100% of any timber in these elements must be legally sourced
Default Cases
noneMaterial Credits for Basic Building Elements
Compliance is based on conformity with four Tier levels, a grading that reflects the rigour of the certification scheme used to demonstrate responsible sourcing.
Durox products are manufactured underanISO14001compliantEnvironmental Management System (EMS). This combined with similar EMS compliance of our supply chain processes as specified in Table: Cat 3.2 of the Technical Guide to the Code for Sustainable Homes, allows Durox products to meet TierLevels3and4.However,theBritish Precast Concrete federation, is developing a certification scheme that will allow the potential for a higher rating to be achieved for concrete products. So specifiers
25
other Topblock constructions achieving enhanced sound insulation
It will be necessary to check with robust Details ltd or Tarmac Topblock that the above constructions remain valid and whether new constructions are added.
In addition to the above constructions, a number of field test reports on separating walls and floors are available that demonstrate enhanced performance can be achieved. This data can be used to provide confidence in the construction specified when using the pre-completion route to compliance. Contact Technical Services for details.
Separating walls, Cavity wall, 75mm (min) cavity unless noted
Number of credits rD Wall Type Suitable Tarmac products
1 E-WM-2 2 leaves minimum width 100mm Hemelite
Standard (finished with plaster)
1 E-WM-3 2 leaves minimum width 100mm Topcrete
Standard (finished with render and
gypsum-based board)
1 E-WM-4 2leavesminimumwidth100mmHemelite
Standard (finished with render and
gypsum-based board)
1 E-WM-8 2 leaves minimum width Hemelite Standard
35mm Saint Gobain – Isover rD35 acoustic batt,
(finished with gypsum-based board)
3 E-WM-11 2 leaves minimum width 100mm Hemelite Standard
(finished with render and gypsum based board,
with minimum 100mm cavity)
3 E-WM-14 2leavesminimumwidth100mmHemeliteStandard
35mm Saint Gobain – Isover rD35 acoustic batt,
(finished with gypsum-based board, with minimum
100mm cavity)
Durox constructions achieving enhanced sound insulation
Separating walls – Cavity wall, 75mm (min) cavity unless noted
Number of credits rD Wall Type Suitable Tarmac products
1 E-WM-6 2 leaves minimum 100mm width Durox Supabloc
4or7,finishedwithrenderandgypsum-based
board
3 E-WM-13 2 leaves minimum 100mm width Durox thin joint,
untied blockwork, finished with render and
gypsum-based board
26
The use of masonry built construction to satisfy the Code for Sustainable Homes is now commonplace. There is no single approach to design that will suit all house types. Tarmac have collaborated with builders on a number of schemes, providing design input and product advice, in determining a solution to meet the required Code level. Meeting the energy efficiency targets (Code 3 is 25% above 2006 Part l Standards)
is probably the most challenging aspect to comply with. There will be site and cost considerations to consider when arriving at the most economic specification. featured is a typical specification for attached housing designed to meet Code level 3. This should be considered as a starting point for the Code assessment and will need to be refined to suit the specifics of individual projects.
Case study
Terraced 2-storey 3-bed housing (floor area 72m2) designed to meet level 3 of the Code for Sustainable Homes.
•Conventional external cavity walls with Durox Supabloc to the inner leaf, internal loadbearing walls and separating walls.
•Tarmac beam and Durox floor infill block ground floors.
•Durox foundation blocks below ground.
Specification Construction
WallU-value=0.24W/m2K facing brick, 100mm Isowool Hi- Cav or similiar full fill cavity insulation
{or 50mm Celotex/Kingspan partial cavity fill},100mm Durox Supabloc
inner leaf, plasterboard on dabs internal finish
FloorU-value=0.16W/m2K 150mm deep Tarmac beam and block floor using Durox infill blocks,
finished with100mm Celotex insulation, screed or chipboard
floor finish.
RoofU-value=0.11W/m2K Pitched tiled roof with 100mm insulation between joists, and
250mm insulation above
OpeningsU-value=1.80W/m2K UPVC Double glazed units
north /south orientation
Thermalbridgingy-value:0.04W/m2K Based on the aircrete Products association’s (aPa) Construction
Details approved by the BrE. The enhanced y-value can be used
in SaP 2005 calculations in lieu of the default value of 0.08 provided
all junction details are in accordance aPa Constructional Details
airtightness 6.5m3/(h.m2)
Heating/hotwater BoilerSEDBUKvalue:91%withtimeandtemperaturezonecontrol.
50mm cylinder insulation.
Solar roof panels 2.5m2.
no secondary heating
Durox can contribute further towards Code compliance as follows:
•Mat1EnvironmentalImpactofMaterials–ManywallandfloorconstructionsusingDuroxblocksachieveGreen GuideratingsofA+orA.•Mat2ResponsibleSourcingofMaterials–CreditsforDuroxwhenusedinwallsandfloorsaspartofthekey building elements.• Hea2SoundInsulation–Duroxspecificationscanbeusedtoachievehigherstandardsofsoundinsulationthan those given in approved Document E of the Building regulations.
Meeting the Code with Durox
27
Durox design
Safe handling
aircrete is an inherently lightweight
material, which ensures that the
majority of Durox aircrete blocks fall
within the guidance (see Health and
Safety Executive Construction Sheet
37) for single-person repetitive
handling. foundation blocks of
350mm x 310mm x 215mm size,
as well as foundation blocks with
a140mmbeddingheightare
available which satisfy the nominal
20kg guidance for single-person
handling.
for guidance on the approximate
weights of Durox blocks refer to
the relevant product pages.
Movement control
Movement joints should be
provided in accordance with
BS 5628-3 generally at intervals of
6m. Movement joints are not usually
necessary for internal walls in
dwellings. In areas of concentrated
stress, such as above and below
openings, consideration should be
given to the introduction of bed
joint reinforcement.
Mortar
The mortar type should be selected
taking into account durability,
structural strength and provision
for movement. Detailed guidance
on the selection of mortars
is given in BS 5628-3 and
BS 8000-3.
for work above ground level (DPC),
mortar designation (iii) will normally
be satisfactory. Below ground level
mortar designation (iii) or (ii) may
be used in accordance with
BS 5628-3.
Stronger mixes, which may be
required for structural reasons,
are not recommended for use
with our aircrete products. all mix
proportions are given by volume.
For further information on mortar, call Tarmac on 08701 116116
Suggested mortar mixes
WOrk ABOve DPC - mOrTAr DeSIgNATION (iii) - COmPreSSIve STreNgTH CLASS m4
a) 1 Portland cement,
1 Hydrated lime,
6 Sand
b) 1 Portland cement,
6Sand+plasticiser
c) 1 Masonry cement
5 Sand
WOrk BeLOW DPC - mOrTAr DeSIgNATION (ii) - COmPreSSIve STreNgTH CLASS m6
a) 1 Portland cement
4Sand+plasticiser
Notes (i) ThesandshouldconformtoBSEN13139
(ii) factory produced mortars or carefully gauged site mixed mortars should be used.
flat metal tie with one end de-bonded in alternate courses
Joint filler
Sealant where required
Typical movement joint
Durox design
BLOCkWOrk TO: (state location)
BLOCkS TO BS eN 771-4: Durox aircrete blocks to Category Compressive Strengths (n/mm2)
1 manufacturing control
mANUFACTUrer: TarmacTopblockLimited BSEN771-4
grADe AND COmPreSSIve STreNgTH: *Supabloc/Coursingbrick 3.6
*Supabloc4 4.2
*Supabloc7 7.3
*Supabloc10 8.7
*System500 3.6
*System600 4.2
*System700 7.3
*Supabloc7/Coursingbrick 7.3
*Foundation 3.6
*Foundation 7.3
*Floor/Coursingslip 3.6
SHaPE anD DIMEnSIonS:**
Wall BloCK: 620mm long x ……mm width x 215mm high (Supabloc,Supabloc4,
Supabloc 7, Supabloc 10)
Wall BloCK: 620mmlongx……mmwidthx214mm/299mmhigh (System 500, 600 and 700)
foUnDaTIon BloCK: 620mmlongx……mmwidthx215mm/140mmhigh
or 350mm x 310mm x 215mm high
floor BloCK: 620mm long x 100mm thick x 530mm wide
CoUrSInG SlIP: 215mmlongx115mmwidthx40mmhigh
CoUrSInG BrICK: 215mmlongx100mm,115mm,125mm,140mm,150mmwidth
x 70mm high
Note *Deleteasapplicable
**Checktheavailablethicknesswiththeindividualproductpages
Wall ties
Use wire butterfly or double triangle
tiescomplyingwithBSDD140-2,at
the density and positioning required
by the Building regulations and
BS 5628-1 & 3. The use of vertical
twist ties should generally be avoided
when using aircrete blocks.
for separating walls, butterfly
ties or ties conforming with
Type a as specified in approved
Document E or robust Detail
Specifications should be used.
Specification
28
Tarmac LimitedMillfields road,Ettingshall,WolverhamptonWV46JP
t: 08701 116 116e: info@tarmac.co.uk
www.tarmac.co.uk
Tarmac and the ‘T’ mark are registered trademarks of the Tarmac Group.
0768/0807
While the information contained in this publication has been prepared in good faith no representation or warranty, express or implied, is made and no responsibility or liability is accepted in relation to the accuracy or completeness of this publication and any opinions expressed in this publication, and any such liability is excluded except to the extent that such liability may not be so excluded or limited by law.
National Sales Helpline
Calluson:08456062468
Technical Helpline
Calluson:08702421489
Email: technical.services@tarmac.co.uk
marketing and Literature requests:
Calluson:08456044114
other building products available from Tarmac include:
lightweight aggregate blocks
Dense aggregate blocks
Thin Joint System blocks
aircrete blocks
Screeds
Mortar
floors
Stairs
Precast solutions
Bespoke Precast solutions service
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