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VSE Project Number: U1932.3389.211 <br />September 26, 2021 <br />Bright Planet Solar <br />ATTENTION: Mikey Heinz <br />103A Millbury St. <br />Auburn, MA 01501 <br />REFERENCE: Contreras, Maria Residence: 723 South Orange Avenue, Santa Ana, CA 92701 <br />Bright Planet Solar Project: BPS135513 <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: California Building Code, 2019 Edition (2018 IBC) <br />Risk Category: II <br />Design wind speed, Vult: 95 mph (3-sec gust) per ASCE 7-16 <br />Wind exposure category: C <br />Seismic design category: D <br />Existing Roof Structure <br />Roof structure: 2x4 rafters @ 32" o.c. <br />Roofing material: composite shingles <br />Roof pitch: 3:12 <br />Connection to Roof <br />Mounting connection: (1) 5/16" lag screw w/ min. 2.5" threaded embedment into framing at max. 64" o.c. along rails <br />(2) rails per row of panels, evenly spaced; panel length perpendicular to the rails not to exceed 72.5 in. Rail cantilever shall <br />not exceed 50% of connection spacing. <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 (2019 CBC, Section 1607.13.5). <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 503.3 of the 2019 CEBC 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 />723 S Orange Ave <br />03/14/22