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Loads <br />Wind Pressures qz = -47.08 psf <br />Tributary Length l = 3.15 ft <br />Attachment Spacing w = 6.00 ft <br />Tributary Area At = 18.875 ft2 <br />Solar Panel Load QD = 3 psf <br />Wind Load PW = qz * At = -889 lbs <br />Dead Load PD = QD * At = 56.625 lbs <br />ASD Uplift Pa = 0.6PW + 0.6PD = -499 lbs <br />Screw to Plywood # 14 Wood Screw <br />Plywood thickness tply = 0.5 in <br />Screw Withdrawal Capacity Tu = 350 lbs (Form No. E830E Group 1 Plywood, V.I.F.) <br />Factor of Safety F.O.S. = 5 <br />Allowable Withdrawal Ts = Tu / F.O.S. = 70.0 lbs <br />Number of Screws per Attachment ns = 6 <br />Load Duration Factor CD = 1.6 <br />Allowable Uplift per Attachment Ta = CD * Ts * ns = 672 lbs <br />Demand Capacity Ratio DCR = Pa / T a = 0.74 < 1 OK <br />Screw Shear Capacity V u = 590 lbs (Form No. E830E Group 1 Plywood, V.I.F.) <br />Factor of Safety F.O.S. = 6 <br />Allowable Withdrawal Vs = Vu / F.O.S. = 98.3 lbs <br />Number of Screws per Attachment ns = 6 <br />Allowable Shear per Attachment Va = CD * Vs * ns = 944 lbs <br />Demand Capacity Ratio DCR = Va / Ta = 0.53 < 1 OK <br />Plywood Bending <br />APA Span Rating 32/16 <br />Rafter Spacing L = 24 in <br />Tributary Width b = 6 ft <br />Equivalent Uniform Load Qa = Pa / (L*b) = -42 psf <br />Plywood Nominal Bending Strength FbS = 370 lb-in/ft <br />Load Duration CD = 1.6 <br />Panel Size Factor Cs = 1.00 <br />Adjusted Plywood Nominal Bending Strength FbS' = 592.00 <br />Plywood Design Capacity wb = 96FbS' / L2 = 98.67 psf <br />Demand Capacity Ratio DCR = wb / Qa = 0.422 < 1 OK <br />Plywood Withdrawal <br />Nail Size 10d <br />Withdrawal Z = 36 lbs/in <br />Number of nails per attachment n = 4 <br />Embedment Length lem = 2.50 in <br />Load Duration CD = 1.6 <br />Plywood Design CapacityZ' = Z * n * lem * CD = 576 lbs <br />Demand Capacity Ratio DCR = Z' / Pa = 0.87 < 1 OK <br />1801 E Edinger <br />Ave - 101113188 & <br />2017800605/17/23