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APA RATED SIDING EXTERIOR I <br /> 5/8" TYPE X GYPSUM SHEATHING <br /> MINERAL WOOL OR GLASS FIBER <br /> INSULATION (OPTIONAL) %( <br /> 5/8" TYPE X GYPSUM WALLBOARD <br /> MIN. 2 X 4 STUDS @ 16" OR 24" O.C. <br /> 0 ONE COMBUSTIBLE LOAD-BEARING WALL ASSEMBLIES <br /> APA RATED SIDING EXTERIOR, 5/8�� TYPE X GYPSUM SHEATHING <br /> GENERIC, NONPROPRIETARY ASSEMBLY BASED ON GA FILE NO. WP8105 IN GYPSUM ASSOCIATION (G.A.) FIRE <br /> RESISTANCE DESIGN MANUAL; APPLICABLE REFERENCES IN 1997 UNIFORM BUILDING CODE (TABLE NO. 7-6), <br /> 2003 INTERNATIONAL BUILDING CODE (TABLE 720.1[21), ITEMS 15-1.15 AD 16-1.1 (2-HOUR)b. <br /> FOOTNOTE: <br /> (b) For a two-hour load-bearing exterior wall of similar construction, see GA File No. WP 8415 (requires two layers of 5/8" <br /> Type X gypsum sheathing on exterior side of wall, and two layers of 5/8" Type x gypsum wallboard on interior side). <br />