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i <br /> �1�!��i 'L..�'i a r 1800 W Ashton Blvd. <br /> Structural Group Lehi, UT 84043 <br /> J.Matthew Walsh,PE Samuel Brown, PE <br /> Senior Structural Engineering Manager Structural Engineer <br /> james.walsh Ca-)vivintsolar.com sam.brown@vivintsolarcom <br /> March 05, 2019 <br /> Re: Structural Engineering Services <br /> Dunn Residence <br /> 6621 Wagon Trail St,Zephyrhills, FL <br /> S-6063545; 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 Section: Prefabricated trusses at 24"on center. Survey photos indicate that there was free access <br /> 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.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.com). <br /> 2. The solar panels are 1'/z"thick and mounted 41/2" off the roof for a total height off the existing roof of 6". At no <br /> time will the panels be mounted higher than 6"above the existing plane of the roof. <br /> Page T of 2 v;v1 nt s u l <br />