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SOLGEN <br />P O W E R <br />Lag Screw Calculation (per ASCE 7-16 Ch. 30 and NDS) <br />This calculation justifies the connection of the solar panels to existing roof members, by showing the <br />connection capacity is equal to or greater than the uplift force demands. <br />Connection Demand <br />Spacing perpindicular to rail 32. in 1/2 panel length <br />Spacing parallel to rail 48 in Max spacing <br />Effective Wind Area on each connection 10.8 ftc <br />Roof Angle 21 degrees <br />Wind Speed 97 mph <br />Exposure Coefficient, K. 0.94 <br />Topographic Factor, K. 1 <br />Directionality Factor, Ka 0.85 <br />Elevation Factor, Ke 0.99 <br />Velocity Pressure, q, 19.1 psf <br />Prying Coefficient 0 <br />Zoned 2e Zones 2n 2r 3r Zone 3e <br />GCp (max) 1.5 2.5 3, <br />Exposed Panels] (yr=1.5) No <br />Pressure Equalization Factor, V. 0.79 0.79 0.79 <br />Uplift Force 22.6 56.4 81.3 psf <br />Max. Uplift Force / Connection (0.6 WL) 146.7 366.8 528.1 Ibs <br />Solar Dead Load (0.6 DL) 16.6 16.6 16.6 Ibs <br />Max. Uplift Force (0.6 WL-0.6 DL) 130.1 350.1 511.5 Ibs <br />Connection Capacity <br />Fastener Type Lag Screw <br />Fastener Diameter in <br />Embedment Length, min in <br />Lumber Species & Grade DFL N2 (Assumed) <br />Lumber Specific Gravity 0161 <br />5 <br />Nominal Withdrawal Capacity, W .0Ibs NDS 12.2-1 <br />fl of Screws <br />Load Duration Factor, Co <br />INwe: cM-4=ea=1.0) <br />Adjusted Withdrawal Capacity, W' 851.2 Ibs <br />Compare Adjusted Withdrawal Capacity to ASD Factored Demand <br />Zones 1, 2e Zones 2n, 2r. 3r Zone 3e <br />O.K. O.K. O.K. <br />