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i <br /> i <br /> Vivint s,�� � r 1800 W Ashton Blvd. <br /> -J Lehi, UT 84043 <br /> Structural Group <br /> J.Matthew Walsh,SE, PE Samuel Brown, PE <br /> Senior Structural Engineering Manager Structural Engineer <br /> james.walshL7a vivintsolar.com sam.Brownt?a vivintsolar.com <br /> March 12, 2019 <br /> Re: Structural Engineering Services <br /> Martinez Residence <br /> 6679 Wagon Trail St,Zephyrhills, FL <br /> S-6068950; 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 is typical wood framing construction with a maximum of two layers of composite shingle <br /> roofing. All wood material utilized for the roof system is assumed to be Southern Pine#2 or better with standard <br /> construction components and consists of the following: <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 /> B. Loading Criteria <br /> 8.02 PSF= Dead Load (roofing/framing) <br /> 2.59 PSF= Dead Load (solar panels/mounting hardware) <br /> 10.61 PSF=Total Dead Load <br /> 20 PSF= Roof Live Load (based on local requirements) <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. Required Structural Repairs <br /> The analysis performed has indicated that the existing roof will require the following repairs prior to installation of the <br /> photovoltaic array: <br /> I <br /> Hip Framing -The mounting hardware is not designed to support the array with the roof framing running horizontally <br /> (cross-slope). At locations where mounting hardware will be installed, install 2x4 blocks between existing framing <br /> members. Each end of the blocks must be secured to the existing framing members with a Simpson Joist Hanger, <br /> Simpson A34 Clip Angle on each side (2 total), or with (2) 16d sinker nails into the end-grain of the block. <br /> Page 1 of 2 v'v'nt. „j J I <br /> e i <br /> ;� <br />