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Wyssling Consulting <br />76 North Meadowbrook Drive <br />Alpine, UT 84004 <br />Scott E. Wyssling, PE, PP, CME office (201) 874-3483 <br />swyssling@wysslingconsulting.com <br /> <br /> September 28, 2021 <br /> <br />Current Insight <br />P.O. Box 12924 <br />Ogden, UT 84412 <br /> Re: Engineering Services <br /> Ziesmer Residence <br /> 2202 Freeman Street, Santa Ana CA <br /> 6.970 kW System <br />To Whom It May Concern: <br />Pursuant to your request, we have reviewed the following information regarding solar panel installation on <br />the roof of the above referenced home: <br />1. Site Visit/Verification Form prepared by a Current Insight representative identifying specific <br />site 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 <br />details for the solar panels. This information was prepared by Current Insight and will be <br />utilized for approval and construction of the proposed system. <br />3. Photographs of the interior and exterior of the roof system identifying existing structural <br />members and their conditions. <br />Based on the above information we have evaluated the structural capacity of the existing roof system to <br />support the additional loads imposed by the solar panels and have the following comments related to our <br />review and evaluation: <br />Description of Residence: <br />The existing residence is typical wood framing construction with the roof system consisting of a truss <br />system with all chords constructed of 2 x 4 dimensional lumber at 24 center. The attic space is <br />unfinished and photos indicate that there was free access to visually inspect the size and condition of the <br />roof rafters. All wood material utilized for the roof system is assumed to be Doug-Fir #2 or better with <br />standard construction components. The existing roofing material consists of tile shingles. Photos of the <br />dwelling also indicate that there is a permanent foundation. <br />A. Loading Criteria Used <br /> 95 MPH wind loading based on ASCE 7-16 Exposure Category C s of 18 degrees <br /> 7 PSF = Dead Load roofing/framing Live Load = 20 PSF Snow Load = 0 PSF <br /> 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 <br />structures in accordance with the 2019 California Building Code. Analysis performed of the <br />existing roof structure utilizing the above loading criteria indicates that the existing rafters will <br />support the additional panel loading without damage, if installed correctly. <br />2202 N Freeman St <br />02/08/22