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Project: <br />Location: <br />WIND LOADS (ROOF 1) <br />Wind loads on standoffs and their attachment to the underlying structure are determined as per the requirements for <br />rooftop solar panels parallel to the roof surface (ASCE 7-16, Section 29.4.4). <br />Risk Category =II <br />Basic Wind Speed, V (ULT) =110 mph <br />Wind Directionality Factor, Kd =0.85 Table 26.6-1 <br />Exposure Category =C <br />Topographic Factor, Kzt =1.0 Table 26.8-1 <br />Ground Elevation Factor, Ke =1.0 Table 26.9-1 <br />Mean Roof Height, h =25 ft (Max) <br />Velocity Pressure Exposure Coefficient, Kz =0.95 Table 26.10-1 <br />Velocity Pressure, qh = 0.00256KzKztKdKeV2 =24.91 psf (ULT)Eq. 26.10-1 <br />qₕ_ASD = 0.6 x qₕ_ULT =14.94 psf <br />Roof Type =Gabled <br />Roof Slope =18 Degrees <br />Array Edge Factor, ɣE =1.0 29.4.4 <br />Effective Wind Area, Aeff =See Table Below 26.2 <br />Design Wind Pressures (ASD), pUPLIFT (ASD)=qh (ASD) . (GCp). ɣE . ɣa ; pASD_MIN = 10 psf Eq. 29.4-7 <br />Standoff Net Uplift Forces, PUplift (ASD) (lbs) =pWIND ASD x Atrib - 0.6PDL (See Table Below) <br />DOWNWARD <br />ALL <br />ZONE 1 <br />(Interior) <br />ZONE 2 <br />(Edge) <br />ZONE 3 <br />(Corner) <br />ZONE 1 <br />(Interior) <br />ZONE 2 <br />(Edge) <br />ZONE 3 <br />(Corner)ALL ZONES <br />48.00 48.00 32.00 48.00 48.00 32.00 48.00 <br />3.06 3.06 3.06 1.70 1.70 1.70 3.06 <br />12.23 12.23 8.16 6.82 6.82 4.54 12.23 <br />Pressure Equalization Factor, ɣA 0.76 0.76 0.80 0.80 0.80 0.80 0.80 <br />-2.00 -2.87 -3.60 -2.00 -3.00 -3.60 0.57 <br />-22.9 -32.9 -43.0 -23.9 -35.9 -43.0 10.0 <br />-260 -383 -338 -152 -234 -188 155 <br />ROOF ATTACHMENT CHECKS <br />Max Standoff Uplift (ASD) ==383 lbs <br />Mount Allowable Uplift ==450 lbs (Per Manuf.) <br />Standoff Demand/Capacity Ratio, DCR ==85%< 100%, Therefore O.K. <br />Fastener Size and Type ==5/16” <br />No. of Fasteners per Standoff, N ==1 <br />Min Fastener Embed Into Framing, T ==2.5 in <br />Fastener Allowable Pullout, W ==246 lb/in <br />Wind Load Duration Factor, LDF =1.6 <br />Additional Factor of Safety, F.S ==1.5 <br />=656 lbs <br />Fastener Demand/Capacity Ratio, DCR ==58%< 100%, Therefore O.K. <br />Lag Screw(s) <br />LANDSCAPE <br />UPLIFT <br />Standoff Net Uplift Forces, <br />PUplift (ASD) (lbs) <br />Effective/Trib. Area, ATrib (ft2) <br />PORTRAIT <br />ZONE <br />GCp <br />Design Wind Pressures (ASD), <br />pUPLIFT (ASD) (psf) <br />Standoff X-Spacing (in) <br />Trib. Width (ft) <br />PRESSURES <br />Fastener Group Allowable Pullout Capacity <br />David Smith <br />Santa Ana, CA <br />30011 Ivy Glenn Dr, Ste 219, Laguna Niguel, CA 92677 <br />info@lagunaengineers.com <br />Panel Configuration <br />Page 3 <br />HISTORIC-825 N <br />Lacy St2/18/2025