LP® FlameBlock® Fire-Rated OSB Sheathing is a code-compliant oriented strand board (OSB) panel with a fire-resistant Pyrotite® treatment covering one or both sides. The Pyrotite treatment consists of a layer of fiberglass-reinforced magnesium oxide cement tightly bonded to the OSB surface. In addition to providing burnthrough resistance and a Class A Flame Spread rating, this layer reinforces the OSB substrate, resulting in full standard load/span ratings and shear design values for each thickness category. LP FlameBlock panels install with standard tools, methods and fasteners, and are highly resistant to cracking or damage from impact.
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