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TopcreteDense aggregate concrete blocks

CI/SfBFf2

November 1997

3

2

T o p b l o c k T o p c r e t e

This brochure describes

‘Topcrete’ dense aggregate

concrete blocks manufactured in

the UK by Tarmac Topblock.

The physical characteristics of

Topcrete blocks make them

particularly suitable for a wide

range of applications in both

loadbearing and non-loadbearing

constructions where good sound

insulation, durability and all round

strength are required.

Topcrete blocks are made in all

three types defined in BS 6073:

‘Precast concrete masonry units’ as:

• solid

• cellular (voids closed at one end)

• hollow (voids open both ends)

All three types are available in

Standard grade and Paint Quality,

whilst solid units are also available

as SPW (Special Party Wall).

Standard grade units are suitable for

render or plaster finishes whilst the

finer surface texture of Paint

Quality units is ideal for walls

intended to receive a direct paint

finish. SPW units are intended for

the construction of solid slender

party walls.

Topcrete blocks are available in

compressive strengths of 3.5, 7.0,

10.0, 15.0, 20.0 and 24.0N/mm2.

Regular blocks are all available in

face sizes of 440mm long × 215mm

high and in thicknesses from 75 to

215mm. A range of blocks with face

sizes of 390 × 190mm can be

manufactured to order.

SPW blocks are available 440mm

long × 65mm high × 195mm thick.

Special Topcrete blocks are

made for coursing and for

forming reveals.

• Coursing bricks are available

solid, Standard grade or Paint

Quality in strengths of 7.0N/mm2,

and measure 215 × 65 × 100mm.

• Reveal blocks are available solid,

Standard grade or Paint Quality,

in strengths to match the

appropriate regular blocks.

Intended to allow reveals to be

constructed without cutting, they

are L shaped and available in

thicknesses of 100 or 140mm with

cavity returns of 40 or 65mm.

Topcrete blocks are also available

in a range of colours: see the

‘Topblock Fair Face’ brochure

for details.

Topcreted e n s e a g g r e g a t e c o n c r e t e b l o c k s

QualityTopcrete products are

BSI Kitemarked to BS 6073

and are manufactured under

a Quality Assurance Scheme

complying with BS EN ISO

9002. They conform to the

‘Special Category of

Manufacturing Control’

requirements specified in

BS 5628: Part 1.

3

Authority

RE

GISTERED

FIR

M

Certificate No.F.M. 948

BS 6073Pts. 1 & 2

Application

St. James’ Park, Newcastle United Football Club – utilising Topcrete


Topcrete blocks are suitable for –

Walls and partitions above ground: Standard grade & SPW for finishing

with render, cladding, plaster or drylining.

Paint Quality for direct decoration.

Walls below ground: Standard grade & SPW for internal and

external use including sulphate soil

conditions.

Beam and block flooring: Standard grade for ground floors and

intermediate floors in housing.

Civil engineering: Standard grade for earth retaining and

sound absorption purposes.

Topcrete blocks are available in

solid, hollow and cellular formats.

Hollow units have voids open both

ends, whilst cellular units have

voids closed at one end.

Hollow and cellular blocks provide

a good strength-to-weight ratio

making them suitable for many

walling situations.

4


Technical Description

Average compressive strength (N/mm2) – Solid block

– Cellular & hollow

Nominal dry density, (kg/m3)

Standardgrade

Paint Quality Special PartyWall (SPW)

7.0, 10.0, 15.0,20.0

3.5, 7.0

1900 – 2000

7.0, 10.0

3.5, 7.0

1800 – 1900

Thermal conductivity at 3% moisture content (W/mK) 1.06 0.93

Drying shrinkage to BS 6073: Part 1 (%) 0.015 – 0.04 0.02 – 0.045

Vapour resistivity (MNs/gm) 100 – 150 100 – 150

Thermal movement (m/K) 10 x 10-6 10 x 10-6

Specific heat capacity (kJ/kgK) 1.0 1.0

24.0

–

2000 – 2100

1.20

0.03

100 – 150

10 x 10-6

1.0

Material properties

Block thickness (mm)

Standard grade

Unit weights (kg)

75 90 100 140 150 190 195*

14.0 17.0 18.5 26.0 28.0 35.0 –

– – 14.5 19.0 – – –

– – 17.0 – – –

– 17.8 24.9 26.7 33.8 –

–

–

Solid

Cellular

Hollow

Paint Quality

Solid

SPW

Solid – – – – – – 11.7

215

40.0

–

27.0

38.2

–

Unit sizes & weights (face size 440 × 215mm)

Notes • *SPW blocks have a face dimension of 440 x 65mm• Unit weights, which are given for design purposes, are approximate only and based on 3% moisture content.• Tolerance to BS 6073: Length +3/-5mm, Height +3/-5mm, Thickness +2/-2mm.• The availability of Cellular and Hollow Paint Quality blocks should be checked with a Regional Sales Office.

Reveal blocks start the running

bond in each course and are

supplied in pairs: each block is

215mm high and a pair will

provide 450mm of wall height.

5


Laid weights including mortar (kg/m2)

Wall thickness(mm)

Standard grade

75 90 100 140 150 190 195

148 177 198 275 295 374 –

– – 155 204 – 210 –

– – 180 – – –

– 187 262 281 356 –

–

–

Solid

Cellular

Hollow

Paint Quality

Solid

– – – – – 400

215

423

–

285

403

––

SPW

Solid

Laid weights

Thickness

Cavity return

Notes • Laid weights are approximate and taken at installed equilibrium moisture content.

Half length

Full length

Block Thickness (mm) × Cavity return (mm)

Full length 440mm

Half length215mm

100 × 40

19.9

10.6

20.9

11.6

27.2

14.1

100 × 65 140 × 40 140 × 65

28.2

15.2

Unit weight (kg)

Unit sizes and weights of reveal blocks

Full & half length reveal blocks

Notes • *Reveal blocks are available in higher strengths if required

FireTopcrete blocks are non-

combustible and conform to class O

rating for the surface spread of

flame. The fire resistance values

shown are in accordance with

BS 5628: Part 3 or based on fire

tests carried out in accordance

with BS 476. The tabulated values

are applicable to Standard grade

and Paint Quality blocks of any

strength. The application of

finishes will generally improve

the fire resistance. Further details

are available.

Thermal resistanceThe thermal performance of each

size and type of Topcrete block is

shown according to its thermal

resistance (measured in m2K/W).

These values should be used when

calculating the U-value of

walls built with Topcrete

blocks. For convenience the

U-values of a range of

typical wall constructions

are featured in the Design

section of this brochure

under ‘External walls’.

6


Performance

Thermal resistance (m2K/W)

Block thickness (mm)

Standard grade

– solid

– cellular

– hollow

100 140 150 190 200 215

0.09 0.13 0.14 0.18 0.19 0.20

0.15

–

0.20

–

–

–

–

0.23

–

–

–

0.25

Paint Quality

– solid 0.11 0.15 0.16 0.20 0.22 0.23

– cellular 0.17 0.21 – – – –

– hollow – – – 0.25 – 0.27

Thermal resistance values

Fire resistance

Minimum thickness (mm) without finish

Loadbearing single leaf

Solid blocks

Non-loadbearing single leaf

Cellular & hollow blocks

Loadbearing single leaf

1 hour

90 100 (150) (150)

75 100 (75) 150 (140) 200 (150)

100 100 – –

Non-loadbearing single leaf 140 (100) 140 (100) 150 –

(tied together with metal ties unless noted)Double-leaf collar jointed with solid blocks

Loadbearing 2 x100mm

2 x100mm

2 x100mm

2 x100mm

Non-loadbearing

Notes • Figures in brackets in Solid Blocks section denote the fire resistance of Topcrete blocks utilising Class 1 Limestone aggregates during manufacture. These are available from certain factories only, and should be specified when their use is essential in meeting the required fire resistance.

• * Blocks tied together with BRC Bricktie CF140.

2 x90mm*

2 x90mm*

2 x90mm*

2 x90mm*

2 hours 4 hours 6 hours

Fire resistance of walls

Notes • All thermal resistance values are based on 3% standard moisture content. The values for cellular and hollow blocks have been calculated in accordance with the Combined Method given in the CIBSE Guide A3 ‘Thermal properties of building structures’

AcousticAn assessment of the sound

insulation performance of Topcrete

walls is given in decibels in terms

of the weighted sound reduction

index, Rw. The index covers the

frequency range of 100 to 3150Hz.

DurabilityTopcrete blocks laid with a suitable

mortar in accordance with BS

5628: Part 3 are durable in

external and internal walls above

and below ground. More detailed

advice on the use of Topcrete

blockwork in exposed and

aggressive conditions may be

found in a separate brochure, the

‘Topblock Design Guide’. When

designed and laid in accordance

with the relevant codes of practice

Topcrete blockwork will have a

normal service life equivalent to

the life of the building.

Resistance tomoistureMoisture in Topcrete block walls

does not adversely affect their

strength. Provision must be made

against water penetration of the

wall and against rising damp as

required by Building Regulations

and Standards.

7


Alpha (UK) Ltd, Milton Keynes – utilising Topcrete

Sound reduction values

Finish

Weighted sound reduction index, Rw (dB)

75mm solid

90mm solid

No finish

44

100mm solid

140mm solid

150mm solid

190mm solid

215mm solid

100mm cellular

140mm cellular or hollow

215mm hollow

Notes • Finishes to walls are assumed to be applied to both faces.• The performance values of walls with finishes is applicble to Standard grade

and Paint Quality blocks. The performance of walls with no finish assumes the use of Paint Quality blocks.

46 47 47

Single leaf wall

46 47 48 48

47 48 49 48

50 51 52 51

51 52 52 52

53 54 54 54

54 55 55 55

45 46 47 46

46 51 52 51

50 53 54 53

Lightweight plaster

Dense plaster Drylining

Full design details for the complete

range of Topblock products can be

found in the ‘Topblock Design

Guide’. The following points apply

specifically to the Topcrete range.

External walls

In cavity walls Topcrete may be

used for either leaf, normally with a

minimum leaf thickness of 90mm.

When used for the outer leaf,

Topcrete should be rendered or

clad. When the cavity is not to be

filled with insulation a clear cavity

of nominal 50mm width should be

maintained, excluding the thickness

of any insulation.

In a single leaf wall the minimum

thickness of Topcrete, with or

without rendering may be

selected from BS 5628: Part 3.

Thermal insulation

Topcrete can be used in many

ways to meet the thermal

insulation requirements of

building regulations.

Illustrated opposite are several of

ways of achieving wall U-values of

0.45W/m2K or better. The U-values

apply to solid and cellular blocks.

For further advice on this subject,

including a more extensive range

of U-values, refer to the ‘Topblock

Design Guide’.

Data on insulation material is

correct at time of publication but

may be subject to change. Please

contact manufacturers for details.

8

Design

MAFF Headquarters, York – utilising Topcrete


9


U-Values (W/m2K) Surface finish

65mm Crown Dritherm batts

65mm Rockwool cavity wall batts

70mm blown mineral woolλ=0.039

No finishi.e. Paint Quality Blocks

Denseplaster

Lightweightplaster

Drylining on dabs

0.43 0.43 0.42 0.40

0.45 0.45 0.44 0.42

0.45 0.45 0.44 0.42

Full cavity fill – brickwork outer leaf • insulation • 100mm Topcrete • surface finish

U-Values (W/m2K) Surface finish

29mm CelotexCW2000

40mm Wallmate CW

No finishi.e. Paint Quality Blocks

Denseplaster

Lightweightplaster

Drylining ondabs

0.44 0.43 0.42 *0.44

0.45 0.45 0.44 0.42

Partial cavity fill – brickwork outer leaf • cavity • insulation • 100mm Topcrete • surface finish

Notes • *25mm of Celotex required

40mm Gyproc Thermal BoardSuper (R=1.73)

50mm Gyproc Thermal BoardPlus (R=1.56)

U-Values(W/m2K)

0.41

0.44

Clear cavity – brickwork outer leaf • cavity • 100mm Topcrete • surface finish

U-Values (W/m2K)

33mm CelotexCW2000

50mm Wallmate CW

100mmthickness

140mmthickness

0.42 *0.45

0.40 0.40

60mm Rockwool HP 0.44 0.43

Profiled steel cladding – steel cladding • insulation • 100mm Topcrete • surface finish

Notes • *29mm of Celotex required

Full cavity fill

Partial cavity fill

Clear cavity

Brickwork outer leaf(or rendered Topcrete)

Insulation

100mm Topcrete

Surfacefinish

Insulated dry lining


Insulation

Insulation

Steel cladding

100mm Topcrete

100mm Topcrete

Surfacefinish

Surfacefinish


100mm Topcrete

Profiled steelcladding

50mm residual cavity

Block thickness

Thermal bridgingApproved Document L requires

provision be made to reduce

thermal bridging around windows,

doors and other wall openings. One

way of achieving this is to close the

cavity with blockwork and an

insulated DPC or similar.

Blockwork provides a substantial

background to which door and

window frames can be fixed. The

dimensions of the blockwork return

should be assessed taking into

account the required cavity width,

any insulating material and an

allowance for the thickness of the

DPC and any mortar. Further

guidance can be found in BRE

Information Paper IP 12/94.

The use of Topcrete reveal blocks

can assist with accurate closing

of the cavity.

Internal wallsTopcrete may be used for single

leaf or cavity internal walls with or

without finishes depending upon

the application.

For partitions in dwellings Topcrete

may be used to provide sound

insulation as well as a suitable

background for finishes and

for fixings.

For commercial and industrial

applications Topcrete may be used

to provide sound insulation, fire

resistance and resistance to impact

damage. Topcrete Paint Quality is

suitable for direct decoration.

Party wallsThe Building Regulations require

domestic party walls to resist the

transmission of airborne sound.

To meet that requirement the

following Topcrete wall

specifications may be used.

• A 215mm solid wall consisting of

100mm Topcrete Standard solid

blocks laid flat and finished with

either 13mm plaster or 12.5mm

drylining on both room faces.

• A 195mm solid wall consisting of

195mm Topcrete SPW blocks, and

finished with either 13mm plaster

or 12.5mm drylining on both

room faces.


Brickworkouter leaf

Insulation

Topcrete

Surface finish

DPC

Frame

Internal window board

215mm

195mm

Flush frame

215mm solid wall

195mm solid wall

DPC

Frame

Brickworkouter leaf

Insulation

Topcrete

Surface finish

Internal window board

Seal

Seal

Recessed frame

10

• Two leaves of 100mm Topcrete

Standard solid blocks with a

50mm cavity using butterfly type

wall ties, and finished with 13mm

plaster on both room faces.

Test evidence to support the use

of Topcrete cellular blocks with a

75mm cavity, and Topcrete solid

blocks with a drylined finish is

available on request.

The Approved Document should

be consulted for full compliance

details including associated flanking

wall construction. Unless the

construction is strictly in

accordance with the above

specification, it is recommended

Building Regulation approval be

obtained before work commences.

Below DPC

Topcrete blocks may be used to

construct internal and external

walls below ground. These blocks

are suitable for use in sulphate soil

conditions class 1 to 3, as defined

in BRE Digest 363 (according to

research conducted by the

Concrete Block Association).

For further advice on this subject,

and on durability refer to the

‘Topblock Design Guide’.

Beam and blockflooring

Topcrete blocks may be used

as infill units in beam and block

flooring for ground and

intermediate floors in housing.

When tested under transverse load

the blocks will support a point load

of 3.5KN over a 420mm clear span.

11


ScreedConcrete floor beam

Topcrete flooring block

Typical Topcrete beam & block intermediate floor

PlasterboardTimber battens

50mm minimum cavity

250mmcavity wall

250mm

Groundlevel

Screed

DPCSeparating layer

Insulation

DPM

Concrete slab

Hardcore with sand blinding

TopcreteStandard block

Topcrete blocks below DPC

Notes • Sand should comply with BS 1200• Sulphate resisting cement may be used below ground in

appropriate sulphate levels as specified by the designer

For this application Topcrete

Standard 7.0N/mm2 strength solid

blocks may be used. Alternatively,

Topcrete Cellular Blocks

(7.0N/mm2) may be considered

although it is recommended that

solid blocks be used at the floor

perimeter to provide a solid bearing

for any walls supported by the floor.

The use of beam and block flooring

systems for intermediate floors in

single occupancy dwellings

provides enhanced sound insulation

between floors and permits a

flexible blockwork partition layout

at upper floor level. The use of

blockwork for upper floor partitions

will assist in reducing airborne

sound transmission between rooms.

Advice on the specification of

Topcrete blocks in separating

floors between dwellings is


Civil engineering

Topcrete cellular blocks laid flat,

with voids exposed, may be used

to line road underpasses for sound

insulation control and

aesthetic purposes.

When used to form permeable

backing to earth retaining structures

hollow blocks should be specified.

Provision formovement

Movement joints should be

provided in accordance with

BS 5628: Part 3 generally at

intervals of 7 - 8m. Movement

joints are not usually necessary

to internal walls in dwellings. To

areas of concentrated stress, such

as above and below openings,

consideration should be given

to the introduction of bed joint

reinforcement. Further guidance

can be obtained from

BS 5628: Part 3 and the ‘Topblock

Design Guide’.

Mortar

The mortar type should be selected

taking into account durability,

structural strength and provision

for movement.

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: Part 3.

For reinforced blockwork

applications and high strength

loadbearing walls, stronger mortar

mixes may be required and expert

advice should be sought.

12


Location

Above ground – internal or

external walls

Mortar designation inaccordance with BS 5628: Part 3

(iii)*

Mortar type by volume

1:1:5-6 cement: lime: sand1:4-5 masonry cement: sand1:5-6 cement: sand withapproved plasticizer

Below ground

(iii)

(ii)**

as above

1:1/2:4-41/2 cement: lime: sand1:21/2-31/2 masonry cement: sand1:3-4 cement: sand with approved plasticizer

Suggested mortar mixes

flat tie to alternatecourses

joint filler

Sealant asrequired

Typical movement joint

FinishesWhen used externally Topcrete

can be finished with

weatherboarding, tile hanging

or render: internally Topcrete

can be plastered or drylined.

Topcrete Paint Quality blocks

are suitable for direct painting.

HandlingThe repetitive one-person

handling of heavy weights has

been identified as posing a risk

of injury (see Health and Safety

Executive Construction sheet

37). Some constructions may

require the use of blocks

exceeding 20kg in weight;

appropriate handling methods

should always be specified

when such blocks are used.

For further advice on this

subject refer to the ‘Topblock

Design Guide’.

13

Specification

Blockwork to: (state location)

Blocks to BS 6073: Pts 1 & 2 Topcrete dense aggregate

concrete blocks

Manufacturer: Tarmac Topblock Limited

Type: *Solid *Cellular *Hollow

Grade: *Standard grade *Paint Quality

*SPW

✝Average compressive strength: *3.5N/mm2 *7.0N/mm2 *10.0N/mm2

*15.0N/mm2 *20.0N/mm2 *24.0N/mm2

Shape and dimensions:

Regular block: 440mm long × 215mm high

× …mm thick

Party wall block: 440mm long × 65mm high

× 195mm thick

Coursing brick: 215mm long × 65mm high

× 100mm thick

Reveal block: 440mm or 215mm long × *100mm or

*140mm thick × 215mm high with a

cavity return of *40mm or *65mm.

* delete as applicable

✝ Not all strengths are available in all grades: please refer to material properties table.


Delivery and storageTopcrete products are packed in

banded or fork-lift packs, and

delivered by crane off-load vehicles.

Packs can be shrink-wrapped or

palletised to facilitate site handling

if required; specify special

requirements when ordering.

Topcrete blocks should be stored on

firm, level ground, clear of standing

water, and be protected by

waterproof sheeting against

frost, wet and mudsplash.

Health and safetyA Health and safety data sheet is


CuttingWhilst Topcrete blocks can be

cut with a hammer and bolster,

mechanical cutting with a hydraulic

block splitter or power-driven saw

is recommended. When blocks are

wet cut they should be allowed to

dry before being built into the wall.

Packs of hollow and cellular blocks

of 140mm thickness and above

include a small proportion of blocks

with pre-formed slots to facilitate

the cutting of half-length units.

The use of coursing bricks and

reveal blocks can greatly reduce

on-site cutting and waste.

LayingDetailed requirements for laying

blocks are given in BS 5628: Part 3

and BS 8000: Part 3. The principle

points are:

• Set out the blockwork to maintain

a regular bond pattern, with a

minimum bond of 1/4 of a block.

• Lay cellular blocks with the closed

ends uppermost to provide

support for the next bed

of mortar.

• Fill all mortar joints including

cross joints as work proceeds.

• Hollow blocks may only be

shell bedded with the

designer’s permission.

• Remove all excess mortar and

tool joints as work proceeds.

• Ensure proper curing of the

mortar by protecting new walling

against rapid drying, keep the wall

moistened with damp hessian

and/or polythene sheeting in

windy or hot weather.

• Protect work against rain and frost

until the mortar is fully cured.

• Lay Topcrete reveal blocks in full

and half length units on successive

courses with the return lip facing

into the cavity.

• Provide a full block bearing

at lintels wherever possible.

• Use cut Topcrete blocks or

Topcrete Coursing bricks to form

small areas of walling, such as

beam filling between joists or

to complete coursing heights.

To ensure the high standard of

workmanship required for

blockwork with a paint finish

the following guidelines should

be observed:

• Arrange the work to avoid

multiple handling of the product.

Wherever possible handle blocks

in packs by mechanical means

and take care to avoid damaging

the units.

• Walling should be designed to

minimise block cutting: do not

build damaged blocks into

the work.

• Use ready-mixed mortars

or carefully gauged site-

mixed mortars.

• The joint profile should be

selected to take account of the

required appearance and if

applicable, exposure conditions.

For internal work a concave

(bucket handle) joint is

recommended.

14


Sitework

• When 190 – 215mm thick solid

walls are required consider using

the double-leaf collar jointed

technique, using two leaves of 90

or 100mm blocks laid back to

back and suitably tied. The

intervening collar joint should

not exceed 25mm and is intended

to be filled with mortar as

work proceeds.

Chasing

Any chases in blockwork must

be carefully made using rotary

chasing machines or mechanical

disc cutters. Avoid heavy impact

tools, the blows will fracture joints

and jeopardise the stability of

the walling.

The depth of chases must be

limited: vertical chases must not

exceed one third, and horizontal

chases one sixth, of the wall

thickness. If hollow and cellular

units are to be chased, take care to

maintain their integrity; the use of

hollow blocks enables services to be

concealed within the walling

without the need to cut chases: this

can be a very cost effective solution.

FinishesPreparationAllow adequate drying out time

before applying render or plaster

finishes. Ensure walls are clean, dry

and free from dust, efflorescence

and all loose particles.

For the purpose of selecting suitable

render and plaster mixes Topcrete

blockwork may be regarded as

having low to moderate suction

with a good key.

RenderingAll work should conform to

the recommendations of

BS 5262 ‘Code of practice for

external renderings’. Render mixes

should not be stronger than 1:1:6

cement:lime:sand or similar

designation (iii) mix.

PlasteringAll work should conform to

the recommendations of

BS 5492: ‘Internal plastering’.

Cement based or proprietary

lightweight plasters may be used.

Suitable lightweight plaster

undercoats include British

Gypsum’s Carlite Bonding

and Thistle Hardwall.

Glazed tilingBlockwork to be tiled must be

allowed to cure for at least one

month before tiling begins. Internal

ceramic tiling is normally fixed

using a suitable adhesive to a 1:4

cement:sand backing coat which

has been allowed to mature for

at least 14 days before

tiling commences.

Tiles may be fixed directly to

blockwork with a suitable thick bed

adhesive provided the blockwork is

built to a sufficient high standard.

All tiling work should conform

to the recommendations of

BS 5385: Part 1: ‘Internal ceramic

wall tiling’.

PaintingInternal blockwork built with

Topcrete products can be painted

with suitable alkali resisting

masonry or emulsion paint.

FixingsTopcrete blocks provide an

excellent background and good

pull-out strength for most types of

fixings, enabling heavy equipment

to be supported without difficulty.

The fixing strength is determined

by diameter, size and type of fixing.

Details of typical pull-out

resistances for the main types of

fixings can be supplied. Topcrete

blocks can be nailed directly with

masonry nails, whilst strong fixings

can be obtained using screws with

plastic plugs.

15


Collar joint

Reinforcement

Double-leaf collarjointed wall

TopblockTarmac Topblock, the UK’s leading block manufacturer, offers a comprehensive range whichincludes aircrete, dense and lightweight concrete blocks. The breadth of range coupled withlong experience of the construction industry, enables Topblock to supply blocks which meetthe demands made of today’s building materials.

Backed by the resources of Tarmac Heavy Building Materials (UK), Topblock has developed anetwork of modern factories and depots which give a good geographical coverage, and aresupported by Topblock’s national sales and technical advisory service.

The Company has a policy of continuous improvement and product development.Therefore information contained in this literature is subject to alteration without notice.

Technical servicesA comprehensive technical advisory service is available to specifiers and users of our products.

Thermal U-value calculation and condensation risk analysis;

Movement Appraisal of movement joint and bed joint reinforcement requirements;

Structural Calculations to support the use of blockwork under vertical loading;Recommended sizes for non-loadbearing walls;

General Recommendations for block types (eg below DPC and party walls);Finishes to blockwork;Sitework.

Topblock’s technical staff are available to answer telephone or writtenenquiries:

Tarmac Topblock LimitedTechnical Services Department,Ford Airfield Industrial Estate,Ford, Arundel, BN18 0HYTelephone: 01903 723 333Fax: 01903 730 884

Topblock’s Specifier Services provides project designers with advice on the selection and use of Topblock’s products from the initial design concept through to project completion.

Tarmac Topblock LimitedSpecifier Services, The Building Centre,26 Store Street, London WC1E 7BTTelephone: 0171 631 0730Fax: 0171 631 1635

Tarmac Topblock LimitedWergs Hall, Wergs Hall Road, Wolverhampton, WV8 2HZ

topcrete - jpa tl - the right information...in the right ... · pdf filetopcrete blocks are...

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