PIR (Polyisocyanurate Insulation Foam) is used in the building trade to create insulation boards. PIR Insulation gives greater heat stability and increased flame resistance. PIR boards are the most popular type of rigid insulation currently available. They are closed-cell, rigid foam board insulation, that are primarily used on the roofs, walls and floors of domestic and commercial buildings. At Manningham Concrete we keep from stock various depths PIR Insulation Boards.