What is PIR?

Polyisocyanurate insulation is a closed-cell rigid foam board manufactured with isocyanate and ployether mixed together in the presence of a catalyst that allows the molecules to rearrange, forming closed cells. Polisocyanurate (PIR) foam is similar in physical form to polyurethane but has improved insulating qualities. It has a wider operating temperature range that surpasses standard Polystyrene, and is fire and smoke resistant.