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v � <br /> DocuSign Envelope ID:3690B31A-DC25-4648-BAAC-225959465045 <br /> 11 1800 W Ashton Blvd. <br /> Lehi, UT 84043 <br /> Structural Group <br /> J.Matthew Walsh,PE Kirk M.Nelson,SE Samuel Brown,PE-Civil <br /> Director of Engineering Structural Engineering Structural Engineering <br /> james.walsh@vivintsolar.com kirk.nelson@vivintsolar.com sam.brown@vivintsolar.com <br /> February 18, 2020 <br /> Re: Structural Engineering Services <br /> Watkins Residence <br /> 7135 Ashland Dr, Zephyrhills, FL <br /> S-6315751; FL-01 <br /> To Whom It May Concern: <br /> We have reviewed the following information regarding solar panel installation on the roof of the above referenced <br /> home: <br /> 1. Site Visit by a representative from our office under my supervision identifying specific interior and <br /> exterior site information including the condition of the existing roof system and the size, spacing, and <br /> condition of existing structural framing members. Information gathered during the site visit includes <br /> photographs, sketches, and verification forms. <br /> 2. Design drawings of the proposed PV System layout, including details to mount the new solar panels to <br /> the existing roof. <br /> Based on the above information,we have evaluated the structural capacity of the existing roof system to support the <br /> additional loads imposed by the solar panels and have the following comments related to our review and evaluation: <br /> A. Description of Residence: <br /> The existing residence has typical wood framing construction with membrane and a maximum of two layers of <br /> composite shingle roofing. All wood material utilized for the roof system is assumed to be Southern Pine#2 or <br /> better with standard construction components. The designed areas of the home consist of the following framing <br /> methods: <br /> • Roof Sections: Prefabricated trusses at 24" on center. Survey photos indicate that there was free <br /> access to verify the framing size and spacing. <br /> • Roof Section: Dimensional lumber - assumed 2x6 at 16" on center. Survey photos indicate that there <br /> 'was not free access to verify the framing size and spacing. <br /> B. Loading Criteria <br /> 9.13 PSF=Dead Load (roofing/framing) <br /> 3.00 PSF=Dead Load (solar panels/mounting hardware) <br /> 12.13 PSF=Total Dead Load <br /> 20 PSF= Roof Live Load (based on local requirements) <br /> I <br /> Wind speed of 145 mph (based on Exposure Category D-the total area subject to wind uplift is calculated for the <br /> Interior, Edge, and Corner Zones of the dwelling.) <br /> C. Solar Panel Anchorage <br /> 1. Installation shall proceed in accordance with the applicable guidelines and recommendations indicated below. <br /> If, during solar panel installation, the roof framing members appear unstable or deflect non-uniformly, our office <br /> should be notified before proceeding with the installation. <br /> • EcoFasten Solar Installation Manual, which can be found on the EcoFasten Solar website <br /> (www.ecofastensolar.co m). <br /> Page 1 of 2 V1 1 ® AD <br />