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6/14/23,3:07 PM Chapter 7: Fire and Smoke Protection Features,2021 Washington State Building Code I UpCodes <br /> g.The fire-resistance rating of concrete masonry units composed of a combination of aggregate types or where plaster is applied directly to the concrete masonry <br /> shall be determined in accordance with ACI 216.1/TMS 0216. Lightweight aggregates shall have a maximum combined density of 65 pounds per cubic foot. <br /> h. See Note b.The equivalent thickness shall be permitted to include the thickness of cement plaster or 1.5 times the thickness of gypsum plaster applied in <br /> accordance with the requirements of Chapter 25. <br /> i. Concrete walls shall be reinforced with horizontal and vertical temperature reinforcement as required by Chapter 19. <br /> j.Studs are welded truss wire studs with 0.18 inch(No.7 B.W.gage)flange wire and 0.18 inch(No.7 B.W.gage)truss wires. <br /> k. Nailable metal studs consist of two channel studs spot welded back to back with a crimped web forming a nailing groove. <br /> I.Wood structural panels shall be permitted to be installed between the fire protection and the wood studs on either the interior or exterior side of the wood <br /> frame assemblies in this table, provided that the length of the fasteners used to attach the fire protection is increased by an amount not less than the thickness <br /> of the wood structural panel. <br /> m. For studs with a slenderness ratio,le/d,greater than 33,the design stress shall be reduced to 78 percent of allowable F'c. For studs with a slenderness ratio,le/d, <br /> not exceeding 33,the design stress shall be reduced to 78 percent of the adjusted stress F' calculated for studs having a slenderness ratio le/d of 33. <br /> n. For properties of cooler or wallboard nails,see ASTM C514,ASTM C547 or ASTM F1667. <br /> o.Generic fire-resistance ratings(those not designated as PROPRIETARY* in the listing)in the GA 600 shall be accepted as if herein specified. <br /> p. NCMA TEK 5-8A shall be permitted for the design of fire walls. <br /> q.The design stress of studs shall be equal to not more than 100 percent of the allowable F`c calculated in accordance with Section 2306. <br /> TABLE 721.1(3) <br /> MINIMUM PROTECTION FOR FLOOR AND ROOF SYSTEMS&q <br /> /o/) <br /> https://up.codes/viewer-export/washington/wa-building-code-2021/chapter/7/fire-and-smoke-protection-features#721.1 15/28 <br />