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VSE Project Number: A0035-0161-221 <br />June 24, 2022 <br />NERD Power <br />2065 W. Obispo Ave., Suite 102 <br />Gilbert, AZ 85233 <br />REFERENCE: David Martinez Residence: 520 S Shawnee Dr., Santa Ana, CA 92704 <br />NERD Power Project: CA-R-190919 <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: B <br />Seismic design category: D <br />Connection to Roof <br />Mounting connection: (1) 5/16" lag screw w/ min. 2.5" threaded 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 69.1 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 />The solar array will be flush-mounted (no more than 6" above the roof surface) and parallel to the roof surface. Thus, we <br />conclude that any additional wind loading on the structure related to the addition of the proposed solar array is negligible. <br />The attached calculations verify the capacity of the connections of the solar array to the existing roof against wind (uplift), <br />the governing load case. Regarding seismic loads, we conclude that any additional forces will be small. Conservatively <br />neglecting the weight of existing wall materials, the installation of the solar panels represents an increase in the total weight <br />(and resulting seismic load) of 2%. Because the increase in lateral forces is less than 10%, this addition meets the <br />requirements of the exception in Section 503.4 of the 2019 CEBC. Thus the existing lateral force resisting system is <br />permitted to remain unaltered. <br /> 1635 N. Greenfield Rd., Ste. 112 / Mesa, AZ 85205 / T (480) 648-3514 / www.vectorse.com <br />Page 1 of 8 <br />520 S Shawnee Dr <br />10/03/22