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City of Santa Ana Building and Safety Department - Santa Ana, CA Subject:Flush-mount PV Installation on New Residences Project: Plan:5A Lot #19 # of Mod 9 860 South Harbor Blvd No. of Stories:3 Santa Ana, CA V&A Project No. 15-3457 The purpose of this letter is to provide a review of the existing single family residential development for the attachment and support of the proposed photovoltaic arrays as outlined in the drawings prepared by Sunnova for City Ventures. The limitation to our review is to the overall support and attachment of the photovoltaic array to the roof system designed by others. The gravity and lateral inpact of the proposed solar system has been accounted for in the original design for the project by the engineer of record for the development The project is to be constructed by City Ventures and has been designed by another licensed engineer per the requirements of the latest edition of the 2022 CBC as amended by the local jurisdiction. Our design includes the assumption that the structure has been designed by a California Licensed engineer and that the structure has been constructed in accordance with that design. The proposed roof structures have been designed for a top chord design dead load of 10 psf, which includes 2.5 psf PV allowance. The project has been designed for a wind exposure C, with an basic wind speed of 100 MPH. The roof is to be constructed of composition shingles. The photovoltaic array will mount flush to the roof planes with a maximum of 8" space between the bottom of the panels and the finish roofing. The proposed photovoltaic array consists of 9 modules on each roof. Roof pitches may vary between 3:12 & 5:12. Panels shall be setback a minimum of 36" from ridge lines and 19" from valleys for all orientations. The photovoltaic array rails shall run perpendicular to the roof slope. The photovoltaic array mounts shall be Unirac, Solar Mount, L-foot or equivalent and shall be installed at a spacing not more than 48” o.c. Each mount shall connected to the roof truss top chord with a minimum of (1) 5/16” diameter stainless steel lag screw with a minimum of 2-1/2” penetration into the top chord of the truss. Vertically adjacent mounts shall not bear on the same roof trusses, but should be staggered over every other truss wherever possible. Mounts should be within 12” of the ends of all rails. V I N C I & A S S O C I A T E S Structural Engineers October 11, 2023 Santa Ana 7 Multi Family Residential Development 175 E. WILBUR ROAD, STE 103 • THOUSAND OAKS, CA 91360 805.496.2100 • VinciSE.com 860 S Harbor Blvd 1/2/2024