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Fire-Rated Assemblies - nationalgypsum.com
www.nationalgypsum.com11 UL LISTED PERMABASE ® CEMENT BOARD PARTITIONS – STEEL FRAMING Fire Rating UL Design No. Description 1 hr. V452 1 1hr. V438 1 hr. U4 20 1 h r. U425 L oad Bearing 2 hr. V452 2 h r. V438 2 hr…