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IMPORTANT: CLICK FOR PIR PRODUCT AVAILABILITY INFORMATION

Celotex CW4000 Cavity Wall Rigid PIR Boards

Standard Celotex Product, generally readily available in most thickness’s

Product Functions Celotex CW4000 installed in a partial fill cavity wall application

The Celotex CW4000 range These boards are aimed specifically at offering cavity wall applications and is reinforced with glass fibres.

These products feature pure aluminium facers and the best reaction-to-fire performance (Euroclass D/S2/d0), measured in accordance with new European Standards, of any similar product on the market.

Common applications include, single timber frame wall lining, steel stud frame walls, timber frame wall lining, timber frame walls sheathing, Rainscreen cladding, basement upgrades and conversions, loft conversions, garage upgrades and conversions

Product Description

The insulation boards are available in nominal dimensions of length (mm) 450 x width (mm) 1200. Required ancillary materials include nailable-plugs, large-headed nails, screws, washers, aluminium joint tape and sealant.

Easy to fit between wall ties using cavity tie clips for retention
Provides reliable long term energy savings for buildings
Low emissivity foil facers give improved thermal insulation with cavity air spaces
Excellent dimensional stability
Conveniently sized boards for installation between cavity wall ties Easy to cut boards to fit

This multi-purpose PIR insulation board has long been at the heart of Celotex product range and achieves an A+ rating when compared to the BRE Green Guide.

Celotex Cavity Wall CW4000 is a premium performance multi-purpose rigid polyisocyanurate foam (PIR) thermal insulation board with reflective foil facings. It provides multi-purpose cavity wall insulation boards that are uniquely reinforced with glass-fibre and features strong reaction-to-fire performance when measured in accordance with new European Standards.

Like the Celotex GA400 range, CW4000 can be installed in conjunction with an appropriate lining panel, for example standard gypsum plasterboard to BS 1230-1 : 1985.

Board size: 1200 x 2400mm, Thickness's 110 - 200mm, Lambda: 0.022 W/mK, Low emissivity foil facings

Product Benefits

Celotex CW4000 (Cavity Wall)  range of high performance thermal insulation provides reliable long term energy savings for buildings. Its low emissivity foil facers give improved thermal insulation and provides a vapour control layer when board joints are taped. Thermal bridging through studs and rails is reduced, and it can be nailed direct to stud framing, and can be dry-lined directly over insulation
These boards can be used in conjunction with appropriate internal lining boards, such as Gyproc or Knauf Plasterboards or associated products such as Knauf Thermal Laminate or Gyproc ThermaLine high performance wall-boards, as an insulating dry lining system to improve the thermal insulation of existing and new, solid or cavity masonry walls or timber-frame walls of dwellings or buildings of similar occupancy, type and conditions.

Celotex is also commonly being used in conjunction with Multi-Foil insulation products such as SuperFoil, SuperQuilt, TLX Silver, TLX Gold, Gen-X, Actis Triso Super 10, and other Actis hybrid insulation.

Certified under BBA certificate number 95/3197 and 09/4667

For the purpose of U value calculations to determine if the requirements of the Building (or other statutory) regulations are met, the thermal conductivity (90/90 lambda value) of the boards may be taken as declared within the Celotex BBA Certificate No. 95/3197.

The requirement for limiting the heat loss through the building fabric will be satisfied if the U values of the building elements, including thermal bridging, do not exceed the maximum values in the relevant Elemental Method given in the national Building Regulations ...

England and Wales - Approved Documents L1 and L2, Table 1 Scotland - Technical Standards J3.2, Tables 1, and J8.3 Northern Ireland - Technical Booklet F, Tables 1.2 and 1.4


Product availability indicators

CW4000 - Price and Availability Advisory:

Presently there are no availability restrictions.

Excellent = Product Availability Excellent Good = Product Availability Good Fair = Product Availability Fair Poor =  Product Availability Poor Undetermined = Product Availability Undetermined
Availability relies on stock levels at closest depots and upon transport logistics to effect deliveries


Technical Data

Celotex CW4000 PIR Insulation Boards for Partial Fill Cavity Wall Applications

Product Code

Board dimensions

Thickness (mm)

λ Value (w/mK)

R-value (m²K/W)

U Value (W/m²K)

Weight (kg/m²)

Unit weight (kg)

Celotex CW4025 20 x 0.45 x 1.2 = 10.80m² 25 0.022 1.10 0.91 0.85 9.18
Celotex CW4040 12 x 0.45 x 1.2 = 6.48m² 40 0.022 1.80 0.56 1.26 8.16
Celotex CW4050 10 x 0.45 x 1.2 = 5.40m² 50 0.022 2.25 0.44 1.55 8.37
Celotex CW4055 9 x 0.45 x 1.2 = 4.86m² 55 0.022 2.50 0.40 1.74 8.46
Celotex CW4060 8 x 0.45 x 1.2 = 4.32m² 60 0.022 2.70 0.37 1.90 8.21
Celotex CW4065 7 x 0.45 x 1.2 = 3.78m² 65 0.022 2.95 0.34 2.05 7.75
Celotex CW4070 7 x 0.45 x 1.2 = 3.78m² 70 0.022 3.15 0.32 2.19 8.28
Celotex CW4075 6 x 0.45 x 1.2 = 3.24m² 75 0.022 3.40 0.29 2.34 7.58
Celotex CW4080 6 x 0.45 x 1.2 = 3.24m² 80 0.022 3.60 0.28 2.48 8.04
Celotex CW4085 5 x 0.45 x 1.2 = 2.70m² 85 0.022 3.85 0.26 2.62 7.07
Celotex CW4090 5 x 0.45 x 1.2 = 2.70m² 90 0.022 4.05 0.25 2.76 7.45
Celotex CW4100 5 x 0.45 x 1.2 = 2.70m² 100 0.022 4.50 0.22 3.27 8.83

Thermal conductivity / Lambda value (W/mK) = 0.022 | Compressive strength (kPa) = ≥ 120 | Water vapour resistance (MNs/g) = > 150 | Fire performance Class 1 in accordance with BS 476 Part 7 | Please Note: R-Value = Thermal Resistance; U Value = Thermal Transmittance Co-efficient; Compressive strength = kiloPascals; Vapour resistance = MegaNewton seconds per gram.

Product Information and Certification

Links to manufacturer's information. Click to download in a separate browser window.

Celotex CW4000 Datasheet | Celotex Masonry Wall Datasheet| Celotex FR5000 Fire Resistant Cavity Wall | Celotex PL4000, GD5000 & GS5000 Cavity Wall |Celotex Handy Guide | Celotex Cavity Wall BBA Certification 

 

CW400 Range - Certification

For the purpose of U value calculations to determine if the requirements of the Building (or other statutory) Regulations are met, the thermal conductivity (90/90 lambda value) of the boards may be taken as declared within the Celotex BBA Certificate No. 94/3080 - CW4000 = 0.023 Wm1K 1
The requirement for limiting the heat loss through the building fabric will be satisfied if the U values of the building elements, including thermal bridging, do not exceed the maximum values in the relevant Elemental Method given in the national Building Regulations thus: England and Wales - Approved Documents L1 and L2, Table 1 Scotland - Technical Standards J3.2, Table 1, and J8.3, Table Northern Ireland - Technical Booklet F, Tables 1.2 and 1.4.


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Product Installation - Celotex CW4000 - Guides for selected applications

Celotex XR4000 timber frame wall lining application

General information relating to the installation of the CW4000 range

CW4000 Cavity Wall Insulation Boards are effective in reducing the U value (thermal transmittance) of new external cavity walls with masonry inner and outer leaves (masonry includes clay and calcium silicate bricks, concrete blocks, natural and reconstituted stone blocks).

It is essential that such walls are designed and constructed to incorporate the normal precautions to prevent moisture penetration.

Buildings subject to national Building Regulations should be constructed in accordance with the relevant recommendations of: BS 5628-3 : 2001. In particular, Clause 5.5.2 of the Code of Practice Rain penetration should be followed in that the designer should select a construction appropriate to the local wind-driven rain index paying due regard to the design detailing, workmanship and materials to be used. BS 8000-3 : 2001.

Other buildings, not subject to these Regulations, should also be built in accordance with the Standards given in section 7.2 of this Certificate.

As with all cavity wall insulation, the construction and detailing should comply with good practice as this is particularly important in areas subject to heavy or severe driving rain.

The use of cavity battens and/or boards during construction is strongly recommended to prevent bridging by mortar droppings.

As with any other form of cavity wall insulation, where buildings need to comply with NHBC Standards, specifiers should observe the requirements of this document.

Buildings up to and including 12 metres high

Where a residual cavity width of 50 mm or greater is specified the product can be used in any exposure zone. However, the use of the boards does not preclude the need to apply any external render coat or other suitable finish in severe exposure zones where such application would be normal practice.

The minimum residual cavity width to be maintained during construction must be 25 mm. To achieve this requirement a greater nominal residual cavity width may need to be specified at the design stage to allow for inaccuracies inherent in the building process. The specifier may either ...

design a cavity width by consideration of the dimensional tolerances of the components which make up the wall by reference to the British Standards relating to the bricks, blocks and boards, or use the data from their respective manufacturers. In addition, allowance may need to be made for the quality of available building operatives and the degree of site supervision or control available,

or

design a nominal residual cavity width of 50 mm (a residual cavity nominally 50 mm wide will be required by the NHBC, where normal standards of tolerance and workmanship are adopted).

The size of residual cavity obtained in the processes described in section 7.8 of this Certificate is also subject to the following limitations in respect of exposure of the proposed building as set out in the table below ...


Maximum allowable total exposure factors of different constructions

Based upon the approach in BS 5618 : 1985.

Construction

Maximum allowable exposure factor E

All external masonry walls protected by rendering (to BS 5262 : 1991) tile hanging, slate

no restriction

One or more external masonry walls constructed from facing clay brickwork or natural stone, the porosity of which exceeds 20% by volume. Mortar joints must be flush pointed or weather-struck

100

One or more external masonry walls constructed from calcium silicate bricks, concrete blocks, reconstituted stone or natural stone, the porosity of which is less than 20% by volume, or any material with raked mortar joints

88

The width of residual clear cavity to be achieved is to be a minimum of 50mm, and the following requirements apply:

from ground level the maximum height of continuous cavity walls must not exceed 12 metres; above 12 metres the maximum height of continuous cavity walls must not exceed 7 metres

the specifier must take care when detailing to ensure that the introduction of the insulation does not affect the weather resistance of the wall. More than average site supervision is recommended during the installation of the product

the exposure factor does not exceed 120

where, for structural reasons, the cavity width is reduced, e.g. by the intrusion of ring beams, a minimum residual cavity width of 25 mm must be maintained and extra care must be taken with fixings and weatherproofing, e.g. inclusion of a cavity tray.

Installation guidelines for internal lining systems

Celotex XR4165 used in suspended timber floor insulation solution

Ensure that existing walls are permeable. Strip any gloss paint or vinyl wallpaper.

Cut the 1200 x 2400 mm Celotex Tuff-R„¢ GA4000 boards to fit the floor-to-ceiling height of the room.

For optimum thermal performance, the unprinted foil surface should face the batten cavity.

Fix horizontal battens over the insulation at the top and bottom of the wall to hold the boards in place.

Seal all board joints to create a vapour control layer using an aluminium foil self-adhesive tape.

Add further vertical battens over the insulation at appropriate spacing to provide adequate fixings for the selected lining system. Ensure that a batten coincides with each lining board joint.

Apply an appropriate sealant around the perimeter of the insulation to provide a vapour seal.

Additional battens are required around all openings to provide fixings for linings and grounds for skirtings, etcetera Battens should be minimum 50 x 25 mm treated softwood.

The batten depth must be increased to take account of the conduit, if cabling is to be located within the cavity created by the battens.

Use independent horizontal battens for heavy wall-mounted components. Longer fixings may be necessary to fix heavy items to the masonry, independently of the battens.

Line window and door reveals with thinner Celotex T-Break TB4000 boards to reduce the risk of thermal bridging. Fix a batten around the edge of the opening and scribe the board to fit the reveal. Cut the dry lining to suit and mechanically fix into the masonry reveal using proprietary fixings. Finish using an angle fillet at the frame and an angle bead or scrim tape at external corners.

Installation guidelines for external render systems

Prior to the installation of the Celotex insulation boards, the substrate must be checked for soundness.

Large uneven projections should be removed and all holes filled and levelled. Loose material should be cleaned off to leave a sound dry surface.

Downpipes should be temporarily removed and if necessary, relocated after completion of installation. Lengthening of overflow pipes should be allowed for, together with extensions to sills.

A starter strip/drip should be located at least one half brick above the dpc and fixed directly to the substrate with plugs and screws.

For optimum thermal performance, the unprinted foil surface should face the batten cavity.

The Celotex insulation should be fixed to the substrate using proprietary fasteners, which are driven into pre-drilled holes.

All insulation board joints should be tightly butted and end joints staggered.

Apply preservative-treated timber battens vertically over the face of the insulation, secured back to the underlying masonry.

Fix a breather membrane horizontally to the faces of the battens with minimum 100mm laps.

Render finish

Fix stainless steel expanded metal lathing to the battens. Proprietary systems are available with reinforcing ribs to allow for a full span of 600 mm between battens. The render system should then be applied in accordance with the manufacturer's guide lines.

Tile hanging

Tilting fillets should be applied at horizontal junctions to suit the design requirements. Fix tile battens to vertical battens to suit the tile gauge. Apply vertical damp proof membranes at all junctions, and hang tiles in accordance with the manufacturer's instructions.

Other cladding

Timber or other lightweight cladding systems can be fixed to the vertical battens.


Contact Manufacturer

Celotex Limited

Lady Lane Industrial Estate, Hadleigh, Ipswich, Suffolk, IP7 6BA

Celotex Technical Advisory Service.

Telephone: 0901 996 0100 (30p per minute) - Fax: 01473 820 889
Email: technical@celotex.co.uk
Web sites: Celotex Home Page / Celotex U-Value Calculator.

Contact us

Insulation Online Limited

27 Massetts Road, Horley, Surrey, RH6 7DQ, UK

Telephone: 0333 8000 828

Facsimile: 0333 7000 797

Email: enquiries@insulation-online.com

Web site: www.insulation-online.com

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