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� i� <br /> 1 <br /> �. � • <br /> � � <br /> � ; 18�0 W Ashtora �Ivd. <br /> � ' Lehi, !JT 84043 <br /> Structural Group <br /> Jon P. Ward, SE, PE J.Matthew Walsh,SE, PE Clint C. Karren, PE <br /> Structura!Engineering Maa�ger Senior Sfrt�ctura!ERgineeri�g Manager Strucfural Engineering Manager <br /> jon.ward�u vivinisolar.com james.walsh�a vivinfsolar.corrr clinf.karren�a vivinisotar.cam <br /> July 18, 2017 <br /> Re: Structurai Engineering Services <br /> Vandemheen Residence <br /> 6041 16th St,Zephyrhills, FL <br /> S-5548605; FL-04 <br /> Ta Wham (t May Concern: <br /> VUe have reviewed the follawing information regarding sofar pane[installation an the roof of the above referenced <br /> hame: <br /> 1. Site UisiUVerification Farm prepared by a representative from aur office under my supervision identifying <br /> specific site information including size and spacing of inembers for the existing roof structure. <br /> 2. Proposed Iayout of the system including connectian detaiEs for the salar panels. <br /> 3. Photographs of the interior and exterior of the roof system identifying existing structural members and <br /> their conditions. <br /> Based an the above information, we have evaluated the structural capacity of the existing roof system to support the <br /> additional loads imposed by the soiar panels and have the fallowEng eomments related to our review and evaluatian: <br /> A. Description of Residence: <br /> The existing residence is typical wood framing construction with a maximum of two layers of composite shingle <br /> roafing. AI!waod material utiiized for the roof system is assumed to be Sauthern Pine#2 or better with standard <br /> construction camponents and consists of the following. <br /> • Roaf Sections: Prefabricated trusses at 24"on center. The attic space is unfinished and phatos indicate <br /> that there was free access to visually inspect the size and condition of the roof inembers. <br /> B. Loading Criteria <br /> 8A2 PSF= Dead�oad (raofinglfiraming) <br /> 2.59 PSF= Dead Laad (solar panels/maunting hardware) <br /> 10.61 PSF=Totaf 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 /> lnterior, Edge, and Carner Zones of the ciwelling.� <br /> C.Solar Panel Anchorage <br /> 1. The solar panels shall be mounted in accordance with the most recent "EcoFasten Solar Installation Manual", <br /> whicn can be found an the EcoFasten Salar websi�e (www.ecofastensolar.com). If during solar panel <br /> installafion, �he roof f�-arning members appear unstable or deflect nan-unifarmly, our office shauld be notifisd <br /> before proceed'+ng with the installation. <br /> 2. The solar panels are i�/z"thick and mounted 4'I�"off the roaf for a total height off the existing roof of 6". At na <br /> time will the panels bt maunted higher than 6"above the existing plane of the roof. <br /> 3. Maximum aflowable pullout p�r lag screw is 307 Ibslinch of penetration as identi�ied in the Nationai Design <br /> Specificatians (NDS} of timber construction specifications for Southern Pine. Based an our evaluation, the <br /> Page 1 of 2 � � � <br /> � _ <br />