LP FlameBlock Fire-Rated Oriented Strand Board (OSB) Sheathing is now included in the CAL FIRE Wildland-Urban Interface (WUI) Products Handbook, published by the California Office of the State Fire Marshall, for use in roof decking exposed as open eaves.

FlameBlock satisfies the WUI rules for use in the underside of open eaves through its CAL FIRE “low ignition surface” classification, which is granted based on the product’s Class A flame spread rating.