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�1 <br /> 4—\ <br /> 2 3 <br /> h f <br /> 2 <br /> ONE HOUR FIRE WALL DETAIL <br /> 1. Framing Nominal 2x4 wood studs, spaced 16 in o.c. , double plates, <br /> single bottom plate <br /> 2. Sheathing 8 in. Type X gypsum wallboard, 4 ft. wide, applied <br /> horizontally. Horizontal Joints are unblocked. <br /> horizontal application of wallboard represents the direction of least fire <br /> resistance as opposed to vertical application. <br /> 3. Insulation 3-1/2 inch-thick mineral wool insulation (2.5 pcf, nominal) <br /> 4. Fasteners 2-1 in. #6 Type S drywall screws, spaced 12 in. o.c. <br />