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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 Lopez Residence <br />Exposure C ASCE 7-16, Section 26.7 2826 Ridge Wood Street <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 =18 deg <br />Roof Type Gable <br />sanchor =72 in Horizontal spacing of roof anchors <br />Atrib =17.27 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 />-2.00 -2.00 -2.94 -2.94 -2.94 -3.45 <br />ga =0.77 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 />-26 psf -26 psf -38 psf -38 psf -38 psf -44 psf Min Pressure = -16 psf <br />Use 26 psf Use 26 psf Use 38 psf Use 38 psf Use 38 psf Use 44 psf ULTIMATE <br />x 0.6 =16 psf 16 psf 23 psf 23 psf 23 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 =17.3 ft2 <br />DLpanel =2 psf <br />Roof Zone 1 2e 2n 2r 3e 3r <br />Wuplift =26 psf 26 psf 38 psf 38 psf 38 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 />-238.7 lbs -238.7 lbs -362.9 lbs -362.9 lbs -362.9 lbs -431.1 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 />CD =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' = CD 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 =239 lbs 239 lbs 363 lbs 363 lbs 363 lbs 431 lbs <br />CAPACITY =745 lbs 745 lbs 745 lbs 745 lbs 745 lbs 745 lbs <br />up to72in ok up to72in ok up to72in ok up to72in ok up to72in ok up 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 />10/26/2022 <br />2826 N Ridgewood St- <br />101118523 & 201823013/11/2024