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Project: Proposed ADU Sheet 12 <br />Address:2121 LEWIS ST AND 2121 LEWIS ST #2 Job No.2025-7 <br />SANTA ANA, CA 97206-2236 Date: <br />B DESIGN OF DIAPHRAGM SHEATHING <br />B.1 ROOF DIAPHRAGM <br />1.Diaphragm Load =5.110 kips w =231.79 plf <br />ASD Design =3.833 kips <br />With Redeundancy (1.3) =4.983 kips <br />2.Diaphragm Span (L) = 21.50 ft Ratio =0.44 :1 < 4:1 OK <br />Diaphragm Depth (D) = 49.25 ft <br />. <br />3.Diaphragm Shear Force = 0.5 x Diaphragm Load =2,491.7 lbs <br />4.Diaphragm Unit Shear Force =0.5*w*L/D =50.59 plf <br />5.Using nominal 15/32 Thk. Plywood with 8D nailing at 6"-6"-12" <br />Blocked Diapragm 175 plf >50.59 plf OK <br />Per CBC Table 2306.2 <br />On Plan: Use 15/32" OSB (Rated Sheathing) with Radiant Barrier <br />CHORD DESIGN - (METAL STRAP DESIGN WHERE NEEDED) <br />Moment = 0.125 x w x L^2 =13,393.15 ft-lbs. <br />T = C = Moment / D 271.94 lbs. <br />Using MSTA36- Strap, Capacity =2,000.00 lbs.>271.94 OK <br />KM Associates Inc Structural Calculation Sheet <br />5/27/2025