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51-50-0506  <<  51-50-0508 >>   51-50-0509

PDFWAC 51-50-0508

Section 508Mixed use and occupancy.

508.4.4.1 Construction. Required separations shall be fire barriers constructed in accordance with Section 707 or horizontal assemblies constructed in accordance with Section 711, or both, so as to completely separate adjacent occupancies. Mass timber elements serving as fire barriers or horizontal assemblies to separate occupancies in Type IV-B or IV-C construction shall be separated from the interior of the building with an approved thermal barrier consisting of a minimum of 1/2 inch (12.7 mm) gypsum board or a material that is tested in accordance with and meets the acceptance criteria of both the Temperature Transmission Fire Test and the Integrity Fire Test of NFPA 275.
[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 19-02-038, § 51-50-0508, filed 12/26/18, effective 7/1/19.]
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