Celotex XR4140 140mm PIR Insulation can be used in various different floor, wall, and roof applications. Celotex is the most widely used thermal insulation product on the market. 140mm Celotex Insulation boards consist of a rigid polyisocyanurate core (PIR), with low emissivity aluminium foil facings on each side. These 140mm Celotex Insulation boards are one of the most efficient insulation products available, with a thermal conductivity of just 0.022 W/mK. 140mm Celotex XR4140 PIR Insulation has a combination of eco-friendly blowing agents that have been proven to have low global warming potential and zero ozone depletion potential (ODP). Celotex XR4140 is certified by the BBA to be used for roof, wall, and floor applications, as long as it is stored and used in accordance with the certificate.