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SHEET: 6 OF 7 <br />DATE: <br />DE JOB NO.: <br />CHECK SCREW ATTACHMENTS FOR WIND UPLIFT <br />Pwuplift =202.2 lb 5/16" Lag with min 1.5" penetration for each attachment <br />Table 12.2A - NDS - Lag Screw Withdrawal Values <br />For 5/16" Lag into .5G wood 266 lb <br />Allowable wind load = 1.6*1.5*266 638.4 lb > 202.2 lb OK <br />CHECK SCREW ATTACHMENTS FOR SHEAR DUE TO SEISMIC Fp <br />Fp = 48.32 lb <br />Roof slope/module tilt 5 deg <br />Shear = Fp*cos( 5 ) = 48.1 lb Fp sin(ang) <br />Tension = Fp*sin( 5 ) = 4.2 lb <br />Fp cos(ang) <br />Table 11K - NDS Z = 190 lb <br />CD = 1.6 ` <br />Z' = Z*CD =304 lb > 48.1 lb OK Withdrawal capacity W' = 638.4 lb <br />Interaction Equation ft/Ft+fv/Fv 0.323 + 0.158 = 0.481 < 1 OK <br />RAIL SPAN CHECK <br />Unirac NXT Rail check Invisimount Rail Properties <br />Tributary width = half a panel Moment of Inertia I = 0.2 in^4 <br />wtrib =2.825 ft Section Modules S = 0.168 in^3 <br />Uniform Load = wind load * wtrib Yield Strength y =35000 psi <br />wSWH =42 plf Tensile Strength <br />u =38000 psi <br />Span = distance between attachment points = L Masd allow = 0.6*y*S 294 lb-ft <br />L = 5.33 ft <br />MSWH = Wswh*L2/8 150.5 lb-ft < 294 lb-ft OK <br />11/26/2024 <br />GUC-3004 <br />PROJECT: <br />CLIENT: <br />BY: <br />PV Panels for Robert Dominguez <br />Guyou Construction, Inc. <br />Doug Engineering <br />1422 W Marion <br />Way1/24/2025