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AOstructures Inc. <br />PO Box 413 <br />Carnelian Bay, CA 96140 <br />916.541.8586 <br />www.AOstructures.com <br />Assumptions <br />● Plywood is laid perpendicular to rafter span direction <br />● Plywood is a continuous 8'-0" member <br />● Plywood is in good repair with no damage from moisture/dryrot/fire/etc. <br />● Plywood has a minimum span rating of 24/0 and a minimum thickness of 15/32" <br />Input Variables <br />Demand Uplift (P) =315.0 lb (See Wind Calcs) <br />Purlin/Joist Spacing =24.0 in <br />Plywood Span Rating =24/0 (Assumed) <br />Plywood Thickness = 15/32 (Assumed) <br />Uplift Demand = 315.0 lb <br />Demand Moment = (5 * P * L) / 32 Pinned/Fixed Condition <br />FbS = (Per APA Table 9 - See Below) <br />Cd = 1.6 (Per APA Table 6) <br />FbS * Cd = <br />Rail Spacing = 44.4 in (Half of a PV Module) <br />Tributary area over which load is applied = Rail Spacing or 4'-0", whichever is less <br />44.4 in <br />Plywood Moment Capacity = <br />Demand / Capacity Ratio = 73% <br />Results: 1628 lb-in capacity > 1181.3 lb-in demand Therefore, OK <br />Plywood Bending Capacity Check <br />Plywood Bending Capacity Check <br />APA Design Capacity Tables <br />275.0 lbf-in/ft <br />440.0 lbf-in/ft <br />1181.3 lb-in <br />1628.0 lbf-in <br />Plywood Decking Check.xlsx 1