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R VEEPTPR <br /> n S <br /> ‘5 1111 <br /> VSE Project Number:U2782.1095.201 . <br /> July 29,2020 Atiri 7 c, ' <br /> Solgen Power CITY op <br /> ATTENTION:Collin Prisbrey Peri?2jt -'� ~ <br /> 5100 Elm Rd Pasco <br /> Pasco,WA 99301 <br /> REFERENCE: Alfonso Aguirre Residence:420 94th Street Southwest,Everett,WA 98204 <br /> Solar Array Installation <br /> To Whom It May Concern: <br /> Per your request, we have reviewed the existing structure at the above referenced site. The purpose of our review was to <br /> determine the adequacy of the existing structure to support the proposed installation of solar panels on the roof as shown on <br /> the panel layout plan. <br /> Based upon our review,we conclude that the existing structure is adequate to support the proposed solar panel installation. <br /> Design Parameters <br /> Code:2015 Washington Building Code(2015 IBC) <br /> Risk Category:II <br /> Design wind speed: 110 mph (3-sec gust)per ASCE 7-10 <br /> Wind exposure category:C <br /> Ground snow load:20 psf <br /> Seismic design category:D <br /> Existing Roof Structure <br /> Roof structure:2x4 manufactured trusses @ 24"O.C. <br /> Roofing material:composite shingles <br /> Roof slope: 19° <br /> Connection to Roof <br /> Mounting connection:(1)5/16"lag screw w/min.2.5"embedment into framing at max.48"o.c.along rails <br /> (2)rails per row of panels,evenly spaced;panel length perpendicular to the rails not to exceed 67 in <br /> Conclusions <br /> Based upon our review,we conclude that the existing structure is adequate to support the proposed solar panel installation. <br /> In the area of the solar array,other live loads will not be present or will be greatly reduced(2015 WBC, Section 1607.12.5). <br /> The gravity loads and; thus, the stresses of the structural elements, in the area of the solar array are either decreased or <br /> increased by no more than 5%. Therefore,the requirements of Section 807.4 of the 2015 IEBC are met and the structure is <br /> permitted to remain unaltered. <br /> 651 W.Galena Park Blvd.,Ste. 101/Draper, UT 84020/T(801)990-1775/F(801)990-1776/www.vectorse.com <br />