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VECTOR <br /> \-1 2.0000 " • (...A Kir <br /> E ncinEERS <br /> VSE Project Number:U2782.0762.201 <br /> April 20,2020 <br /> Solgen Power <br /> ATTENTION:Collin Prisbrey <br /> 5100 Elm Rd Pasco <br /> Pasco,WA 99301 <br /> REFERENCE: Christopher Casey Residence:4807 Wilmington Avenue,Everett,WA 98203 <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 will require a retrofit per the attached detail in order <br /> to support the proposed solar panel installation.The required sister rafter size is 2x8. <br /> Design Parameters <br /> Code:Washington State 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: 25 psf <br /> Existing Roof Structure <br /> Roof structure:2x6 rafters @ 24"O.C. <br /> Roofing material:composite shingles <br /> Roof slope: 18° <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 will require a retrofit per the attached detail in order to <br /> support the proposed solar panel installation. See attached calculations. <br /> 651 W.Galena Park Blvd.,Ste. 101/Draper, UT 84020/T(801)990-1775/F(801)990-1776/www.vectorse.com <br />