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Travis Perkins£21.29Visit shop 50mm x 1200mm x 450mm Celotex PIR Cavity Wall Insulation Board CW4000
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This guide is for builders, renovators, and homeowners looking to improve the thermal efficiency of masonry cavity walls. The Celotex CW4075 insulation board offers a high-performance, rigid PIR solution that significantly reduces heat loss, leading to lower energy bills. A key caveat is that installation must strictly adhere to Celotex's guidance and BBA certification for optimal performance and safety. This product features a rigid polyisocyanurate core with a low emissivity foil facing, offering excellent thermal conductivity and ease of handling.
| Model Part Number | CW4075 |
|---|---|
| Brand | Celotex |
The thermal conductivity of Celotex CW4075 is 0.022 W/m.K.
It is designed for partial fill masonry cavity walls in new builds, existing buildings, and extensions.
Boards should be stored flat in a dry environment, away from direct sunlight and ignition sources, and protected from moisture.
The BBA certificate number for Celotex Cavity Wall Insulation is 16/5343.
No, this product is specifically for masonry cavity walls and not suitable for solid walls.
You can cut the boards using a fine-toothed saw or a sharp insulation knife for a clean edge.
The low emissivity foil facing improves thermal performance by reducing radiant heat transfer within the sealed cavity air spaces.
Ensure boards are cut accurately and butted together tightly. Use appropriate expanding foam or sealant if minor gaps persist, ensuring it is compatible with the insulation material.
Verify that the correct board thickness is used and that there are no significant thermal bridges. Ensure the low emissivity foil is facing the correct air space. Consult the BBA certificate for U-value calculations and installation requirements.
Ensure the building envelope is properly protected against moisture. Check that the cavity wall construction and any protective membranes are intact and correctly installed as per building best practices.
Setup:
Ensure the cavity is clean and free from debris before installation. The Celotex CW4075 boards are designed to be cut to size using a fine-toothed saw or insulation knife. Install boards by pushing them into the cavity, ensuring they fit snugly against the inner leaf and the damp-proof course. Boards should be installed in a brick-bond pattern, and adjacent boards must be butted together tightly.
Compatibility:
This product is specifically designed for partial fill masonry cavity walls. Ensure compatibility with existing wall construction and building regulations. Always consult the BBA certificate (16/5343) for specific application details and limitations. Use appropriate fixings and cavity closers as recommended by Celotex.
Care:
Store boards flat in a dry environment, away from direct sunlight and sources of ignition. Protect from moisture during storage and installation. Clean any dust or debris from the boards before installation using a dry cloth.
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