Durox aircrete blocks High performance for a faster build · BS EN 771-4 CERTIFICATE No. 00/3776 appearance Durox blocks have a white, medium textured surface. Each product type is

Durox aircrete blocks

High performance for a faster build

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


3.6 4.2 7.3


460 630 680


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


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


FOUNDATION


3.6 7.3


460 680


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.


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.


70mm

215mmWidth

BrICkS

FACe SIZe (mm)

215 x 70 for all products


3.6 7.3


460 680


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


3.6


460


0.11

TrANSverSe STreNgTH (kN) mIN

3.5

reACTION TO FIre

Class a1


LeNgTH x WIDTH (mm) 620 x 530 620 x 215*

THICkNeSS (mm) 100 100

FLOOr

15.6 6.3


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.


40mm

115mm215mm COUrSINg SLIPS

SIZe (mm)

215x40x115


3.6


460

UNIT WeIgHT (kg)

0.5


0.11

reACTION TO FIre

Class a1 for all products

12

13


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


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


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



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





60mm Kingspan TW50or similar†




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.



85mmCrownDritherm34

100mmCrownDritherm34

80mm Springvale PlatinumEcobead






















125mm Crown Dritherm 32 or Isover Hi-Cav 32


Solid Walls using 215mm Durox

exTerNAL FINISH

20mm render

TileHanging+40mmPIR(λ=0.023W/mK)insulationlaid between vertical battens at400mmcentres



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




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.


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.


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


cement mortar, plasterboard on battens, paint


cement: lime mortar, plaster, paint


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

29

Tarmac LimitedMillfields road,Ettingshall,WolverhamptonWV46JP

t: 08701 116 116e: [email protected]

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


Email: [email protected]

marketing and Literature requests:


other building products available from Tarmac include:

lightweight aggregate blocks

Dense aggregate blocks

Thin Joint System blocks

aircrete blocks

Screeds

Mortar

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Stairs

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Specialist building products

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Documents

Durox aircrete blocks High performance for a faster build · BS EN 771-4 CERTIFICATE No. 00/3776 appearance Durox blocks have a white, medium textured surface. Each product type is