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AAw I RON RI DGE 28357 Industrial Blvd <br /> Hayward, CA 94545 <br /> 1-800-227-9523 <br /> IronRidge.com <br /> Attn: Corey Geiger, COO, IronRidge Inc. <br /> Date: November 19th, 2018 <br /> Re: Structural Certification for IronRidge Flat Roof Attachment (FRA) <br /> This letter addresses the structural capacity of the IronRidge Flat Roof Attachment (FRA) for use as a roof <br /> attachment for flush or tilt mounted PV solar systems. FRA is a deck mounted component directly fastened to <br /> and supported by the underlying structural roof deck. FRA consists of a circular die-casted aluminum base, an <br /> optional membrane flashing, and a centered 3/8" stainless steel connection bolt used to secure compatible rail <br /> mounting brackets including the IronRidge Tilt Kit (North and South) and L-Foot. Assembly of FRA, chosen rail <br /> mounting brackets, and accompanying hardware shall be installed in accordance with IronRidge's Flat Roof <br /> Attachment installation manual. Full assembly details are shown in Exhibit-0017. <br /> The stated capacities in this letter apply to the assembly of FRA and a particular rail mounting bracket with no <br /> consideration of the connection of the assembly to the underlying roof deck or the assembly connection to the <br /> above supported rail system. The capacities are based on mechanical load testing using a Universal Instron <br /> Test Unit or by using structural design code based analysis. The testing and analytical work conform to the <br /> following building codes and design standards: <br /> Mechanical load testing standards: <br /> ASTM B 557-10, Standard Test Method for Tension Testing Wrought and Cast Aluminum and <br /> Magnesium-Alloy Products <br /> ASTM A370-13, Standard Test Methods and Definitions for Mechanical Testing of Steel Products <br /> ASTM D1761-12, Standard Test Methods for Mechanical Fasteners in Wood <br /> ICC-428, Acceptance Criteria for Modular framing Systems Used to Support Photovoltaic (PV) <br /> Modules <br /> Analytical method standards: <br /> ADM-2015, Aluminum Design Manual <br /> AISC Design Guide 27-2013: Structural Stainless Steel <br /> AISC 360-10, Specification for Structural Steel Buildings <br /> For each load direction reported for the particular FRA assembly shown in Figures 1 through 3, the tabulated <br /> nominal capacities based on mechanical load testing were the average of peak loads observed in the specified <br /> load direction. The witnessed ultimate failure mode was also documented accordingly. The calculated nominal <br /> resistances per analysis are defined by the referenced structural code for the most critical failure mode <br /> described in the tables below. The safety factor provided is associated with the reported failure mode and used <br /> to derive the allowable capacity for the specified load direction. <br /> ©2018 IronRidge, Inc. Flat Roof Attachment Certification Letter-1 <br />