Celotex CW4100 Cavity Wall Insulation Board - 100mm

The Celotex CW4100 is primarily used for partial fill insulation in masonry cavity walls in both new builds and existing buildings to improve thermal performance and energy efficiency.

The thermal conductivity of the Celotex CW4100 board is 0.022 W/m.K, indicating excellent thermal insulating properties.

No, the CW4100 is specifically designed for partial fill applications and should not be used for full fill cavity insulation.

The specific product detailed is 100mm thick. Celotex offers various thicknesses in the CW range, such as 75mm (CW4075) and 50mm (CW4050), but the CW4100 refers to the 100mm variant.

The double-sided aluminum foil facing enhances thermal performance. It does not typically require special treatment but should be kept clean and undamaged during installation. It provides low emissivity benefits in sealed cavity air spaces.

The Celotex CW4100 Cavity Wall Insulation Board is certified under BBA certificate number 16/5343.

Boards should be stored flat in a dry environment, protected from moisture, direct sunlight, and excessive heat to maintain their integrity and performance.

Ensure the correct thickness of insulation board is used for the cavity width. If slight gaps exist, consider using a compatible insulation filler or sealing tape as per Celotex guidelines. Do not force boards, as this can damage them.

Check for gaps or discontinuities in the insulation layer. Ensure joints are well-butted and air leakage paths are minimized. Verify that the U-value calculations were accurate for the specific construction and insulation used.

Minor tears can often be repaired with appropriate foil tape. For significant damage, the affected section of the board may need to be replaced to maintain thermal performance.

Use a sharp insulation knife or a fine-toothed saw specifically designed for cutting rigid insulation boards. Measure carefully and cut on a stable surface.