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Wyssling Consulting <br />76 N. Meadowbrook Drive <br />Alpine, UT 84004 <br />(201) 874-3483 <br />swyssling@wysslingconsulting.com <br />V = 95 Basic Wind Speed Jimenez Residence <br />Exposure C ASCE 7-16, Section 26.7 2321 S Rene Drive <br />Kz = 0.85 Velocity Pressure Coefficient, ASCE 7-16, Figure 26.10-1 Santa Ana, CA <br />Kzt = 1 Topographic Factor, ASCE 7-16, Section 26.8.2 <br />Kd = 0.85 Directionality Factor, ASCE 7-16, Section 26.6 <br />Ke = 0.996 Ground Elevation Factor, ASCE 7-16, Section 26.9 <br />qh = 16.6 psf qh = 0.00256KzKztKdKeV2 (ASCE 7-16 Eq. 26.10-1) <br />Roof Angle = 23 deg <br />Roof Type Gable <br />sanchor = 48 in Horizontal spacing of roof anchors <br />Atrib = 11.52 sf Panel Area tributary to each roof anchor <br />GCp External Pressure Coefficient, ASCE 7-16, Figure 30.3-2 <br />Roof Zone Zone 1 2e 2n 2r 3e 3r <br />-1.50 -1.50 -2.49 -2.49 -2.49 -3.31 <br />ga = 0.79 Pressure Equalization Factor, ASCE 7-16 Figure 29.4.-8 <br />gE = 1.00 Edge Array Factor, ASCE 29.4.4 edges < 0.5*building height, and panel spacing < 4ft. <br />pnet = qhGCpgEga =Design Wind Pressure, ASCE 7-16, Equation 29.4-7 <br />Roof Zone 1 2e 2n 2r 3e 3r <br />-20 psf -20 psf -33 psf -33 psf -33 psf -44 psf Min Pressure = -16 psf <br />Use 20 psf Use 20 psf Use 33 psf Use 33 psf Use 33 psf Use 44 psf ULTIMATE <br />x 0.6 = 16 psf 16 psf 20 psf 20 psf 20 psf 26 psf ALLOWABLE <br />Connection to Existing Roof Framing <br />F.S. = 1 Additional Factor of Safety applied to withdrawl force, if desired <br />Atrib = 11.5 ft2 <br />DLpanel = 2 psf <br />Roof Zone 1 2e 2n 2r 3e 3r <br />Wuplift = 20 psf 20 psf 33 psf 33 psf 33 psf 44 psf <br />Plag = F.S. x Atrib x (0.6D - 0.6W) =Withdrawl force for each roof anchor <br />Roof Zone 1 2e 2n 2r 3e 3r <br />-119.5 lbs -119.5 lbs -209.3 lbs -209.3 lbs -209.3 lbs -284.0 lbs <br />Connection Capacity <br />db = 5/16 in Lag Screw diameter <br />Dpen = 2 1/2 in Lag Screw penetration into existing framing member <br />No. of Screws 1 Screws per Connection <br />Species of wood framing <br />C D = 1.6 Load Duration Factor for Wind Loading, NDS Table 2.3.2 <br />Ct = 0.7 Temperature Factor, NDS Table 10.3.4 <br />W = 266 lb/in Withdrawl Capacity, NDS Equation 11.2-1 <br />W' = C D x Ct x W = 298 lb/in Adjusted withdrawl value <br />Pallow = Dpen x W' = 745 lbs <br />Roof Zone 1 2e 2n 2r 3e 3r <br />DEMAND = 119 lbs 119 lbs 209 lbs 209 lbs 209 lbs 284 lbs <br />CAPACITY = 745 lbs 745 lbs 745 lbs 745 lbs 745 lbs 745 lbs <br />up to72in okup to72in okup to72in okup to72in okup to72in okup to72in ok <br />This analysis calculates the <br />capacity of the lag screws <br />only. For capacity of the <br />complete mounting system, <br />please see manufacturer's <br />recommendations. <br />Douglas Fir-Larch <br />Wind Uplift <br />Rooftop Solar Panels Parallel to Roof Surface <br />ASCE 7-16, Section 29.4.4 <br />10/18/2022 <br />2321 S Rene Dr <br />01/25/23