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1 hour fire wall <br /> 41/ Design# UL U305 <br /> GA file#WP 3605 <br /> STC—35 <br /> NGC-2403 <br /> U305: 5/8"(15.9 mm) Fire-Shield Gypsum Board or 5/8"XP Fire-Shield Gypsum Board applied <br /> horizontally or vertically to each side of 2x4 wood studs 16"o.c.with 6d coated nails, 1-7/8" long, <br /> 0.0915"shank, 1/4"heads,7"o.c. at edges. Joints of square edge, bevel edge or predecorated wall <br /> board may be left exposed. Joints staggered 16" on opposite sides. <br /> IL . <br />