The Celotex XR4000 General Purpose Insulation Board 2.4m x 1.2m x 165mm (L x W x T) is a multi-purpose insulation board that fills wall or floor cavities in between and over rafters. Manufactured from rigid polyisocyanurate, it helps in improving thermal insulation performance within cavity air spaces. It has high performance, is lightweight, easy to cut, handle and install. Whether it’s a pitched roof, framed wall or floor, Celotex PIR is an ideal solution among contractors and installers.