The Celotex CW4000 PIR Cavity Wall Insulation Board is a high-performance product engineered to provide superior thermal insulation for cavity walls. Measuring 1.2m x 450 x 75mm, this robust board features PIR (polyisocyanurate) foam core, sandwiched between two layers of low emissivity aluminium foil facings. This insulation board is easy-to-install, durable and designed to minimise heat loss, making it an economical and environmentally-friendly choice for both new-build and refurbishment projects.