40mm Celotex CW4000 Cavity PIR Cavity Insulation Board delivers exceptional thermal performance through advanced polyisocyanurate (PIR) technology with low emissivity foil facing. Available in thicknesses from 40mm to 100mm, this insulation board is engineered for partial fill cavity wall installations.
Please note: Celotex has ceased production of 25mm, 55mm, 65mm, 70mm, 80mm and 90mm thicknesses. Request a quotation for suitable alternatives.
Euroclass F Reaction to Fire classification, according to BS EN 13501-1. Products with this level of classification are not provided with a rating for smoke emission.
This 40mm Celotex CW4000 board achieves outstanding thermal efficiency with a thermal conductivity rating of 0.022 W/m.K, allowing thinner insulation layers whilst meeting your target U-values.
The low emissivity foil facing significantly boosts thermal performance within sealed cavity air spaces, delivering superior U-value results.
These 40mm celotex cavity insulation boards are lightweight and rigid, ensuring simple transport, handling, and installation. They're designed to align with standard wall tie spacing for straightforward fitting.
This 40mm Celotex CW4000 partial fill product carries BBA certification, verifying its performance for specified partial fill cavity wall applications when installed and maintained according to certification requirements. Consult the BBA certification documentation for full details and any limitations.
When installing 40mm Celotex pir partial fill insulation, verify compliance with current Building Regulations and all relevant national guidance, plus local and applicable construction standards for your specific project. Fire safety requirements and height restrictions must be observed.








