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© 2021 IronR idge, Inc. CA Flush Mount System Certification Letter - 1 28357 Industrial Blvd. Hayward, CA 94545 1-800-227-9523 IronRidge.com Attn: Corey Geiger, COO, IronRidge Inc. Date: July 1st, 2021 Re: Structural Certification and Span Tables for the IronRidge Flush Mount System This letter addresses the structural performance and code compliance of IronRidges Flush Mount System. The contents of the letter shall be read in its entirety before applying to any project design. The Flush Mount System is a proprietary rooftop mounting system used to support photovoltaic (PV) modules installed in portrait or landscape orientation and set parallel to the underlying roof surface. PV modules are supported by extruded aluminum XR Rails and secured to the rails with IronRidge mounting clamps. The XR Rails are side mounted to a selected roof attachment with 3/8 stainless steel bonding hardware and then attached directly to the roof structure or to a stanchion that is fastened to the underlying roof structure. Assembly details of a typical Flush Mount installation and its core components are shown in Exhibit EX-0015. The IronRidge Flush Mount System is designed and certified to the structural requirements of the reference standards listed below, for the load conditions and configurations tabulated in the attached span tables. ASCE/SEI 7-16 Minimum Design Loads for Buildings and Other Structures (ASCE 7-16) 2018 International Building Code (IBC-2018) 2019 California Building Code (CBC-2019) 2015 Aluminum Design Manual (ADM-2015) Report SEAOC (Structural Engineer Association of California) PV2-2017 Wind Design for Solar Arrays The tables included in this letter provide the maximum allowable spans of XR Rails in the Flush Mount System for the respective loads and configurations listed, covering wind exposure categories B, C, & D, roof zones provided in ASCE 7-16 for gable & hip roof profiles, and roof slopes of 8° to 45°. The tabulated spans are applicable when the following conditions are met: 1. Span is the distance between two adjacent roof attachment points (measured at the center of the attachment fastener). 2. Each module shall be supported by 2 rails (2 rail system) or 3 rails (3 rail system). Spans are calculated based on 2 rail systems, and conservatively deemed acceptable for 3 rail systems. 3. The underlying roof slope, measured between the roof surface and horizontal plane, is 8º to 45º. 4. The mean roof height, defined as the average of the roof eave height and the roof ridge height measured from grade, does not exceed 30 feet. 5. A clearance from the underside of the array to the roof surface of 2 minimum shall be provided and the height of the array, the distance from the module top surface to the roof surface (defined as h 2 ), shall not exceed 10. 6. Module length and area shall not exceed the maximum values listed on the respective span tables. 7. All Flush Mount components shall be installed in a professional workmanlike manner per IronRidges Flush Mount Installation Manual and other applicable standards for the general roof construction practice. © 2021 IronRidge, Inc. CA Flush Mount System Certification Letter - 4 28357 Industrial Blvd. Hayward, CA 94545 1-800-227-9523 IronRidge.com The span tables provided in this letter are certified based on the structural performance of IronRidge XR Rails only with no consideration of the structural adequacy of the chosen roof attachments, PV modules, or the underlying roof supporting members. It is the responsibility of the installer or system designer to verify the structural capacity and adequacy of the aforementioned system components in regards to the applied or resultant loads of any chosen array configuration. Sincerely, Gang Xuan, SE Senior Structural Engineer 2021.07.14 17:00:22 -07'00' 4609 W El Don Pl - 101111434 & Rev 10111225111/23/22