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VSE Project Number:U2782.0762.201 <br /> Christopher Casey Residence <br /> 4/20/2020 <br /> E l G i l s E R S <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 9.7%. 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 /> rr,s 7 4 <br /> .... .„„.„,,,, _fr,„ O <br /> f �E5t$s <br /> AA,vigrfoNAI~ C <br /> 04/20/2020 <br /> Wells Holmes,S.E. <br /> WA License:51006-Expires: 10/06/2020 <br /> Project Engineer <br /> Enclosures <br /> WLH/chp <br /> 651 W.Galena Park Blvd.,Ste.101/Draper, UT 84020/T(801)990-1775/F(801)990-1776/www.vectorse.com 2 P4o <br />