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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 Muro Residence <br />Exposure C ASCE 7-16, Section 26.7 1313 South Baker 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 = 0.970 Ground Elevation Factor, ASCE 7-16, Section 26.9 <br />qh = 16.2 psf qh = 0.00256KzKztKdKeV2 (ASCE 7-16 Eq. 26.10-1) <br />Roof Angle = 5 deg <br />Roof Type Gable <br />sanchor = 72 in Horizontal spacing of roof anchors <br />Atrib = 20.61 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 1' Zone 2 Zone 3 <br />-1.68 -0.90 -2.28 -3.16 <br />ga = 0.75 Pressure Equalization Factor, ASCE 7-16 Figure 29.4.-8 <br />gE = 1.00 Edge Array Factor, ASCE 29.4.3 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 1' Zone 2 Zone 3 <br />-21 psf -11 psf -28 psf -39 psf Min Pressure = -16 psf <br />Use 21 psf Use 16 psf Use 28 psf Use 39 psf ULTIMATE <br />x 0.6 = 16 psf 16 psf 17 psf 23 psf ALLOWABLE <br />Connection to Existing Roof Framing <br />F.S. = 1 Additional Factor of Safety applied to withdrawl force, if desired <br />Atrib = 20.6 ft2 <br />DLpanel = 3 psf <br />Roof Zone 1 1' Zone 2 Zone 3 <br />Wuplift = 21 psf 16 psf 28 psf 39 psf <br />Plag = F.S. x Atrib x (0.6D - 0.6W) =Withdrawl force for each roof anchor <br />Roof Zone 1 1' Zone 2 Zone 3 <br />-222.9 lbs -166.8 lbs -312.7 lbs -445.4 lbs <br />Connection Capacity <br />db = 1/5 in Lag Screw diameter <br />Dpen = 2 in Lag Screw penetration into existing framing member <br />No. of Screws 2 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 = 190 lb/in Withdrawl Capacity, NDS Equation 11.2-1 <br />W' = C D x Ct x W = 213 lb/in Adjusted withdrawl value <br />Pallow = Dpen x W' = 853 lbs (Using (2) screws per connection) <br />Roof Zone 1 1' Zone 2 Zone 3 <br />DEMAND = 223 lbs 167 lbs 313 lbs 445 lbs <br />CAPACITY = 853 lbs 853 lbs 853 lbs 853 lbs <br />up to72in ok up to72in okup to72in ok up to72in ok <br />Douglas Fir-Larch <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 />12/2/2022 <br />1313 S Baker St <br />03/24/23