2 Hour Exterior Wall at Exterior

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2 Hour Exterior Wall. Openings in exterior walls in adjacent stories shall be separated vertically to protect against fire spread on the exterior of the buildings where the openings are within 5 feet (1524 mm) of each other horizontally and the opening in the lower story is not a protected opening with a fire protection rating of not less than 3 / 4 hour. The thickness and number of the layers of type x gypsum wallboard are specified for each.

LP FlameBlock FireRated Assemblies LP Building Products
LP FlameBlock FireRated Assemblies LP Building Products from lpcorp.com

See complete listing at ul product iq. Before you start, we recommend you apply the finishing product to a small exposed. Finish the wall with a 1.

LP FlameBlock FireRated Assemblies LP Building Products

Exterior walls (wallboard protection on interior side of wall) Use where wall is required to be rated from the exterior and interior sides. Single layer 1 type fsw gypsum board one side, double layer 1/ Use where wall is required to be rated from the exterior and interior sides.