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VSE Project Number: U3998.0066.231 <br />West Alton Residence <br />3/30/2023 <br />The solar array will be flush-mounted (no more than 10" 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 4.6%. Increases in lateral forces less than 10% are considered acceptable. Thus the existing <br />lateral force resisting system 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. The use of solar panel support span tables provided by others is <br />allowed only where the building type, site conditions, site-specific design parameters, and solar panel configuration match <br />the description of the span tables. The design of the solar panels, solar 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. Vector Structural Engineering shall be <br />notified of any changes from the approved layout prior to installation. <br />VECTOR STRUCTURAL ENGINEERING, LLC <br />03/30/2023 <br />_______________________________________________________ <br />Jacob Proctor, P.E. <br />CA License: 70567 - Expires: 06/30/2023 <br />Project Engineer <br />Enclosures <br />JSP/tcf <br />03/30/2023 <br />651 W. Galena Park Blvd., Ste. 101 / Draper, UT 84020 / T (801) 990-1775 / F (801) 990-1776 / www.vectorse.com <br />941 W Alton Ave - <br />201 7966906/27/23