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.