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76 North Meadowbrook Drive <br />Scott E. Wyssling, PE Alpine, UT 84004 <br />Coleman D. Larsen, SE, PE office (201) 874-3483 <br />Gregory T. Elvestad, PE swyssling@wysslingconsulting.com <br />TIME SAVER ELECTRIC <br />32203 VIA BENABARRE, TEMECULA <br />CA USA 92592 <br />Re: Engineering Services <br />Nguyen Residence <br />ST, Santa Ana, CA 92704 <br />20.400 kW System <br />To Whom It May Concern: <br />We have received information regarding solar panel installation on the roof of the above referenced <br />structure. Our evaluation of the structure is to verify the existing capacity of the roof system and its ability <br />to support the additional loads imposed by the proposed solar system. <br />A. Site Assessment Information <br />1. Site visit documentation identifying attic information including size and spacing of framing <br />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 will be utilized for approval and construction <br />of the proposed system. <br />B. Description of Structure: <br />Roof Framing: 2x4 dimensional Rafters at 24” on center. <br />Roof Material: Comp Shingle <br />Roof Slope: 20 degrees <br />Attic Access: Accessible <br />Foundation: Permanent <br />• Dead Load <br />o Existing Roofing and framing = 7 psf <br />o New Solar Panels and Racking = 3 psf <br />o TOTAL = 10 psf <br />C. Loading Criteria Used <br />• Dead Load <br />o Existing Roofing and framing = 2.6 psf <br />o New Solar Panels and Racking = 3 psf <br />o TOTAL = 5.6 PSF <br />• Live Load = 20 psf (reducible) – 0 psf at locations of solar panels <br />• Ground Snow Load = 5 psf <br />• Wind Load based on ASCE 7-16 <br />o Ultimate Wind Speed = 1 15 mph (based on Risk Category II) <br />o Exposure Category C <br />Analysis performed of the existing roof structure utilizing the above loading criteria is in accordance <br />with the 2022 California Building Code, including provisions allowing existing structures to not <br />require strengthening if the new loads do not exceed existing design loads by 105% for gravity <br />elements and 110% for seismic elements. This analysis indicates that the existing framing will <br />support the additional panel loading without damage, if installed correctly. <br />July 11 , 2023 <br />525 S Marine St <br />07/28/23