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November 06, 2024 Subject: Proposed Solar Panel Installation Trang Do Residence, 5402 W Lehnhardt, Santa Ana, CA To Whom it May Concern, Design Parameter Summary Governing Building Code: 2022 California Residential Code Risk Category: II Wind Exposure: C Design Wind Speed: 110 mph Ground Snow Load: 10 psf Roof Information Roofing Material: Asphalt Shingles Roof Slope: 18, 20 degrees We have reviewed information, provided by our client, related to the proposed solar panel installation at the above-referenced address. The purpose of the review was to determine if the existing roof is structurally adequate for the proposed installation. Based on our review and analysis of the given information, and in accordance with governing building codes, I certify that the capacity of the structural roof framing that directly supports the additional gravity loading due to the solar panel supports and modules had been reviewed and determined to meet or exceed the requirements in accordance with the Design Criteria. Engineering Analysis Framing Mount Wood Screws: (2) #14 Self-Drilling Screw with a minimum penetration depth of 2.5" into rafter only, at 72" O.C. max Roof Structure: 2x6 Rafters @ 24" O.C. (assumed) Roof Connection Details Wind uplift on the panels has been calculated in accordance with the relevant provisions of ASCE 7-22. This loading has been used to verify the adequacy of the connection specified above. Connection locations should be in accordance with design drawings. Stagger attachments to avoid overloading any individual rafter. The proposed installation will be 5" max. above the roof surface (flush mounted) and parallel to the roof surface. Therefore, any increase in wind loading on the building structure from the solar panel installation is expected to be negligible. Wind is the governing lateral load case. Because the increase in lateral loading is not increased by more than 10%, per provisions in the adopted building codes, the structure need not be altered for lateral loading. IronRidge XR10 rails will support the modules and will fasten to the roof structure with IronRidge QuickMount Halo Ultragrip along the rail. The proposed installation - including weight of panels, racking, mounts, and inverters where applicable - will be approximately 3 psf. In the areas where panels are installed, roof live loads will not be present. The reduction of roof live load is adequate to fully or partially compensate for the addition of the panel installation. Because the member forces in the area of the solar panels are not increased by more than 5%, and so per provisions in the adopted building codes, the structure need not be altered for gravity loading. The roof structure need not be altered for either gravity loading (including snow) or lateral loading (including wind). Therefore, the existing structure is permitted to remain unaltered. Connections to the roof must be made per the "Roof Connection Details" section above. Copies of all relevant calculations are enclosed. Conclusion 5402 W Lehnhardt Ave11/25/2024