It is formed by heating, foaming & laminating. Polyurethane is the best material for temperature keeping and sound insulation. It is widely used as the wall or roof for cold storage, industrial workshop, public building etc. The panels are laid on metal bearing structures. They are fixed using fastener screws. The panels are supplied with a single coated sealing strip made of polyurethane foam which should be laid longitudinally between the panels so as to obtain a damp-proof unit, thereby precluding any risk of condensation, all flashings are in the same color as the panels.