This Celotex CW4000 insulation board has been designed as a solution to partial fill insulation for masonry cavity walls. The high performance rigid polyisocyanurate (PIR) insulation boards have been sized to fit between cavity wall ties and is suitable for use in both new and existing builds as well as extensions. Along with the low thermal conductivity value of 0.022 W/mK of the (thickness) and low emissive aluminium foil facing helping the CW4000 to achieve lower U-values this PIR board is among the best-performing insulation materials available on the market, offering reliable long-term savings for buildings it’s installed in. The benefits of Celotex partial fill cavity insulation The Celotex CW4000 has been sized specifically to fit the standard wall tie spacing requirements, means no cutting is required so that it can be quickly and easily installed. The CW4000 is an insulation solution that when installed correctly can help meet carbon dioxide emissions and energy use targets which have been set by the national building regulations and is CE-marked. Specifications Dimensions: 1200mm x 450mm x 40mm Fire Rating: Class 1 BS 476, BBA certified Pack Quantity: 14 boards Pack Coverage: 7.56m2