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VSE Project Number: U2782.1095.201 <br /> Alfonso Aguirre Residence <br /> 7/29/2020 <br /> EneinEERs <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 5.2%. Because the increase in lateral forces is less than 10%, this addition meets the <br /> requirements of the exception in Section 807.5 of the 2015 IEBC.Thus the existing lateral force resisting system is permitted <br /> 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 /> WA Firm License:2202 <br /> g iIND ij- <br /> sy <br /> oi wAs <br /> AM fr <br /> 5l i, `_ 4, <br /> 3 km,F� - <br /> 07/29/2020 <br /> Wells Holmes,S.E. <br /> WA License: 51006-Expires: 10/06/2020 <br /> Project Engineer <br /> Enclosures <br /> WLH/csr <br /> CZ-- 0... <br /> 651 W.Galena Park Blvd.,Ste. 101/Draper,UT 84020/T(801)990-1775/F(801)990-1776/www.vectorse.com <br />