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Project: <br />Location: <br />Calc. by: <br />Date: <br />WIND LOADS (ROOF 1 to 3) <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, K d = 0.85 Table 26.6-1 <br />Exposure Category =C <br />Topographic Factor, Kz t = 1.0 Table 26.8-1 <br />Ground Elevation Factor, K e = 1.0 Table 26.9-1 <br />Mean Roof Height, h =12 ft (Max) <br />Velocity Pressure Exposure Coefficient, K z = 0.85 Table 26.10-1 <br />Velocity Pressure, qh = 0.00256KzKztKdKeV 2 =22.35 psf (ULT)Eq. 26.10-1 <br />qₕ_ASD = 0.6 x qₕ_ULT =13.41 psf <br />Roof Type =Gabled <br />Roof Slope =20 Degrees <br />gE =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). gE . ga ; 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 />gA 0.78 0.78 0.80 0.80 0.80 0.80 0.80 <br />-2.00 -2.91 -3.60 -2.00 -3.00 -3.60 0.57 <br />-20.8 -30.3 -38.6 -21.5 -32.2 -38.6 10.0 <br />48.00 48.00 32.00 48.00 48.00 32.00 48.00 <br />2.88 2.88 2.88 1.71 1.71 1.71 2.88 <br />11.52 11.52 7.68 6.83 6.83 4.56 11.52 <br />-219 -328 -283 -134 -208 -168 136 <br />ROOF ATTACHMENT CHECKS <br />Max Standoff Uplift (ASD) = 328 lbs <br />Standoff Allowable Uplift = 450 lbs (Per Manuf.) <br />Standoff Demand/Capacity Ratio, DCR = 73%< 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 Per Inch, W = 246 lb/in <br />Additional Factor of Safety, F.S =1.5 <br />656 lbs <br />Fastener Demand/Capacity Ratio, DCR = 50% < 100%, Therefore O.K. <br />Lag Screw(s) <br />Panel Configuration LANDSCAPE <br />UPLIFT <br />Standoff Net Uplift Forces, <br />PUplift (ASD) (lbs) <br />Trib. Area, ATrib (ft 2) <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 />Minnis Residence <br />Santa Ana, CA <br />PE <br />28202 CABOT ROAD, SUITE 300 <br />LAGUNA NIGUEL, CA 92677 <br />11/12/2021 <br />Fastener Group Allowable Pullout Capacity, <br />TALL = (N x W x T x LDF = 1.6) / (F.S.) = <br />LAGUNA <br />CONSULTING ENGINEERS <br />LAGUNA PACIFIC GROUP, INC. <br />Page 3 <br />2401 N Hathaway <br />08/17/22