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WCONS Wyssling Consulting <br /> • _ 76 North Meadowbrook Drive <br /> Alpine, UT 84004 <br /> Scott E. Wyssling, PE, PP, CME office (201) 874-3483 <br /> swyssling@wyssiingconsuiting.com <br /> August 13,2020 <br /> Scott`� Digitally signed to .L= E Wyssl ng <br /> Jon Kirchner,VP of Technology T` � ,-DN:CAUS,S=Utah,L=Alpine,O=Wyssling Consulting, <br /> { rRCN=ScottEWyssling+E=swyssling®wysslingconsulting.00m <br /> Sigora Solar 1 Reason:l am the author of this document <br /> 1222 Harris Street ` Location:your signing location here <br /> Date:202D-Charlottesville, VA 22903 W yss l i n g j-6kit,PhimttoOmPDF Verson:10.0.0 <br /> Re: Engineering Services <br /> Singleton Residence <br /> 5301 17th Street, Zephyrhills FL <br /> 11.520 kW System Size <br /> Dear Mr. Kirchner: <br /> Pursuant to your request, we have reviewed the following information regarding solar panel installation on the roof of <br /> the above referenced home: <br /> 1. Site Visit/Verification Form prepared by a Sigora Solar representative identifying specific site <br /> information including size and spacing of rafters for the existing roof structure. <br /> 2. Design drawings of the proposed system including a site plan, roof plan and connection details for <br /> the solar panels.. This information was prepared by Sigora Solar and will be utilized for approval and <br /> construction of the proposed system. <br /> 3. Photographs of the interior and exterior of the roof system identifying existing structural members <br /> and their conditions. <br /> Based on the above information we have evaluated the structural capacity of the existing roof system to support the <br /> additional loads imposed by the solar panels and have the following comments related to our review and evaluation: <br /> Description of Residence: <br /> The existing residence is typical wood framing construction with the roof system consisting of 2 x 6 dimensional <br /> lumber at 24" on center. The attic space is unfinished and photos indicate that there was free access to visually <br /> inspect the size and condition of the roof rafters. All wood material utilized for the roof system is assumed to be <br /> Doug-Fir #2 or better with standard construction components. The existing roofing material consists of composite <br /> asphalt shingles. Photos of the dwelling also indicate that there is a permanent foundation. <br /> A. Loading Criteria Used <br /> e 140 MPH wind loading based on ASCE 7-10 Exposure Category"Brr at a slope of 15 degrees <br /> e 7 PSF= Dead Load roofing/framing Live Load=20 PSF Snow Load= 0 PSF <br /> e 3 PSF­ Dead Load solar panels/mounting hardware <br /> Total Dead Load=10 PSF <br /> The above values are within acceptable limits of recognized industry standards for similar structures in <br /> accordance with the FBC 2017. Analysis performed of the existing roof structure utilizing the above loading <br /> criteria indicates that the existing rafters will support the additional panel loading without damage, if <br /> installed correctly. <br />