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76 North M eadowbrook Drive <br />A l p i n e, U T 8 4 0 0 4 <br />Col eman D. Larsen, SE, P E office (201) 874-3483 <br />Gregory T. Elvestad, P E swyssi ing@wyssl ingconsutting.com <br />N o v e m b e r 4, 2 0 2 2 <br />C u r r e n t I n s i gh t <br />2 8 5 2 W . A m i n i W a y <br />S o u t h J o r d a n , U T 8 4 0 9 5 <br />Re: Engineering Services <br />Weibel Residence <br />2529 A l on a Street, Santa An a, C A <br />5.600 k W System <br />To W h om It M ay Concern: <br />W e h av e received information regarding solar panel installation on the roof of the above referenced <br />structure. O u r evaluation of the structure is to verify the existing capacity of the roof system an d its ability <br />to support the additional loads imposed by the proposed solar system. <br />A. Site A s s e s s m e n t I n f o r m at i o n <br />1. Site visit documen tati on 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 f o r approval an d construction <br />of the proposed system. <br />8B. D e s c r i p t i o n o f S t ruc t ur e: <br />R o o f F r a m i n g: 2 x6 dimensional lumber at 24? on center. <br />R o o f M ater i al : Composite A s p h al t Shingles <br />R o o f Sl op e: 23 degrees <br />A t t i c A c c e s s : Accessible <br />F o u n d a t i o n : ? Permanent <br />C. L o a d i n g Criteria U s e d <br />«D ead L oad <br />o Existing Roofing and framing = 7 psf <br />o N ew Sol ar Panels an d Racking = 3 psf <br />o T O T A L = 1 0 P S F <br />«L i v e L o ad = 2 0 psf (reducible) ? 0 psf at locations of solar panels <br />« G r o u n d S n o w L oad =0 psf <br />* W i n d L oad based o n A S C E 7-16 <br />o Ultimate Wind Speed = 95 mph (based on Risk Category II) <br />o Exposure Category C <br />Analysis p erf orm ed of the existing roof structure utilizing the above loading criteria is in accordance <br />with the 2019 California Building Code, including p rov is i on s allowing existing structures to not <br />require strengthening i f the n ew loads do n ot exc eed existing design loads by 105% for gravity <br />elements an d 1 10 % for seismic elements. This analysis indicates that the existing framing will <br />support the additional p an el loading without damage, if installed correctly. <br />2529 N Alona St <br />02/16/23