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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 Vandervoort Residence <br />Exposure C ASCE 7-16, Section 26.7 2307 North Towner 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 =0.995 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 =20 deg <br />Roof Type Gable <br />sanchor =48 in Horizontal spacing of roof anchors <br />Atrib =12.33 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 -2.98 -2.98 -2.98 -3.55 <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 />-26 psf -26 psf -39 psf -39 psf -39 psf -47 psf Min Pressure = -16 psf <br />Use 26 psf Use 26 psf Use 39 psf Use 39 psf Use 39 psf Use 47 psf ULTIMATE <br />x 0.6 =16 psf 16 psf 23 psf 23 psf 23 psf 28 psf ALLOWABLE <br />Connection to Existing Roof Framing <br />F.S. =1 Additional Factor of Safety applied to withdrawl force, if desired <br />Atrib =12.3 ft2 <br />DLpanel =3 psf <br />Roof Zone 1 2e 2n 2r 3e 3r <br />Wuplift =26 psf 26 psf 39 psf 39 psf 39 psf 47 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 />-174.9 lbs -174.9 lbs -270.1 lbs -270.1 lbs -270.1 lbs -325.7 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 2 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 =205 lb/in Withdrawl Capacity, NDS Equation 11.2-1 <br />W' = CD x Ct x W =229 lb/in Adjusted withdrawl value <br />Pallow = Dpen x W' =1147 lbs (Using (2) screws per connection) <br />Roof Zone 1 2e 2n 2r 3e 3r <br />DEMAND =175 lbs 175 lbs 270 lbs 270 lbs 270 lbs 326 lbs <br />CAPACITY =1147 lbs 1147 lbs 1147 lbs 1147 lbs 1147 lbs 1147 lbs <br />up to72in ok up to72in ok up to72in ok up to72in ok up to72in ok up to72in ok <br />Spruce-Pine-Fir <br />Wind Uplift <br />Rooftop Solar Panels Parallel to Roof Surface <br />ASCE 7-16, Section 29.4.4 <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 />Signed 5/16/2023 <br />2307 N Towner St - <br />2017896310/18/2023