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Wood Screw Calculation (per ASCE 7-22) <br />Connection Demand <br />Spacing perpendicular to rail, in 34 <br />Roof Angle, degrees 18 <br />Roof Layout Gable <br />Wind Speed, mph 110 <br />z 0.95 (Table 26.10-1) <br />zt 1.00 (Table 26.8.1) <br />d 0.85 (Table 26.6-1) <br />e 1.00 (Table 26.9-1) <br />z, psf 24.8 (Table26.10-1) <br />Zones:1 2n, 2r, 2e 3r, 3e <br />Spacing parallel to rail, in 72 72 72 <br />p (max)(Figure 29.4-7)2.00 2.67 3.19 <br />E = 1.5) (Fig. 29.4-7)No No No <br />Effective Wind Area on each con., ft2 17.0 17.0 17.0 <br />a (Figure 29.4-8)0.71 0.71 0.71 <br />Uplift Force, psf (Equation 29.4-7)35.1 46.9 56.0 <br />Max. Uplift Force / Connection (0.6 WL), lbs 358.4 478.5 570.7 <br />Solar Dead Load (0.6 DL). Lbs 30.6 30.6 30.6 <br />Max. Uplift Force (0.6 WL - 0.6 DL), lbs 327.8 447.9 540.1 <br />Connection Capacity <br />Attachment FTG IronRidge QuickMount Halo Ultragrip <br />Attachment location Framing <br />Fastener Type Wood Screw <br />Fastener Diameter, in 0.242 <br />Embedment Length, in 2.5 <br />Lumber Species & Grade DFL #2 (Assumed) <br />Nominal Withdrawal Capacity W, lbs 431 <br /># of Screws 2 <br />d 1.6 <br />Screw Adj. Withdrawal Cap. W', lbs 1379 <br />Attachment FTG Strength with Cd, lbs 1606 <br />Max applied load, lbs 540 <br />Max allowable load, lbs 1379 <br />Compare Adjusted Withdrawal Capacity to ASD Factored Demand <br />Zones:1 2n, 2r, 2e 3r, 3e <br />O.K. O.K. O.K. <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 />5402 W Lehnhardt <br />Ave11/25/2024