PolyisocyanuratePIR

A cellular polymer produced by reacting polyols with isocyanates, available in rigid closed-cell grades for insulation and core applications and in flexible grades for cushioning. Rigid PU foam is used as the insulating core of composite building panels and as a sandwich core where structural demands are modest, and spray-applied forms are used in roofing and cavity insulation.

A roof construction in which the thermal insulation is placed above the structural deck, keeping the deck and supporting structure at close to internal temperature. A vapour control layer is normally installed on the warm side of the insulation to limit the risk of interstitial condensation.

The rate at which a material conducts heat. Polymers and cellular foams have low conductivity and act as insulators, while metals conduct readily, a contrast that matters in roof build-ups, battery enclosures and mould tooling.