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VSE Project Number: U1932.3053.211 <br />Gomez, Guillermina Residence <br />10/12/2021 <br />The solar array will be low-profile (no more than 18" above the roof surface). Thus, we conclude that any additional wind <br />loading on the structure related to the addition of the proposed solar array is negligible. The attached calculations verify the <br />capacity of the connections of the solar array to the existing roof against wind (uplift), the governing load case. Regarding <br />seismic loads, we conclude that any additional forces will be small. The installation of the solar panels represents an increase <br />in the total weight (and resulting seismic load) of 9.9%. Because the increase in lateral forces is less than 10%, this addition <br />meets the requirements of the exception in Section 503.4 of the 2019 CEBC. Thus the existing lateral force resisting system <br />is permitted to remain unaltered. <br />Limitations <br />Installation of the solar panels must be performed in accordance with manufacturer recommendations. All work performed <br />must be in accordance with accepted industry-wide methods and applicable safety standards. The contractor must notify <br />Vector Structural Engineering, LLC should any damage, deterioration or discrepancies between the as-built condition of the <br />structure and the condition described in this letter be found. Connections to existing roof framing must be staggered, except <br />at array ends, so as not to overload any existing structural member. The use of solar panel support span tables provided by <br />others is allowed only where the building type, site conditions, site-specific design parameters, and solar panel configuration <br />match the description of the span tables. The design of the solar panel racking (mounts, rails, etc.) and electrical engineering <br />is the responsibility of others. Waterproofing around the roof penetrations is the responsibility of others. Vector Structural <br />Engineering assumes no responsibility for improper installation of the solar array. <br />VECTOR STRUCTURAL ENGINEERING, LLC <br />10/12/2021 <br />_______________________________________________________ <br />Jacob Proctor, P.E. <br />CA License: 70567 - Expires: 06/30/2023 <br />Project Engineer <br />Enclosures <br />JSP/wrm <br />10/12/2021 <br />651 W. Galena Park Blvd., Ste. 101 / Draper, UT 84020 / T (801) 990-1775 / F (801) 990-1776 / www.vectorse.com <br />2235 S. Park Drive <br />03/14/22