Celotex CW4000 PIR Cavity Wall Insulation Board 75mm (0.54m²)

Celotex CW4000 is an easy-to-install polyisocyanurate (PIR) thermal insulation board with a low emissivity foil facing, supplied in thicknesses from 40 mm to 100 mm for partial fill cavity wall applications.

Celotex CW4000 is a rigid polyisocyanurate (PIR) insulation board with low emissivity foil facings on both sides, designed specifically for partial fill masonry cavity wall applications. The 1200 x 450 mm board size and squared edges help the boards fit between standard wall tie spacings, assisting with straightforward installation.

With a declared thermal conductivity of 0.022 W/m·K and thicknesses from 40 mm to 100 mm, Celotex CW4000 provides good thermal performance to help achieve target U-values with thinner wall build-ups. The product is BBA certified for defined partial fill cavity wall constructions and manufactured under independently monitored quality and environmental management systems in line with EN ISO 9001 and EN ISO 14001.

• Lightweight 1200 x 450 mm PIR insulation boards.
• Squared edges to suit standard wall tie spacings.
• Low emissivity foil facings on both sides.
• Declared thermal conductivity 0.022 W/m·K.
• BBA certified for partial fill masonry cavity wall applications.

Typical applications

Partial fill masonry cavity walls in external walls of domestic and non-domestic buildings, where a residual cavity is maintained in line with the BBA certificate and applicable Building Regulations.

Key considerations

Use Celotex CW4000 only in partial fill cavity wall applications that comply with relevant national Building Regulations and guidance; Do not use this product in the external walls of buildings over 11 metres in height, where only non-combustible or limited-combustibility insulation should be used; Always refer to the product datasheet, Declaration of Performance, safety data sheet and applicable BBA certificate for details of permitted wall constructions, minimum residual cavity requirements and any additional restrictions.