How Is It Made?
The unique Pyrotite® ignition-resistant coating on LP FlameBlock Sheathing is our secret weapon against fire. Covering an LP® OSB panel, the Pyrotite coating is a layer of non-combustible magnesium oxide with two quarts of water chemically locked into every 32 square feet of the coating's structure in the inert form. The bound water is released when exposed to the intense heat created by fire. Once released, this moisture helps LP FlameBlock Sheathing resist burn-through and slow the spread of fire.