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<br /> <br /> <br /> <br />March 31, 2020 <br /> <br />Unirac <br />1411 Broadway Blvd. NE <br />Albuquerque, NM 87102 <br /> <br />Attn.: Unirac - Engineering Department <br /> <br />Re: Engineering Certification for the Unirac U-Builder 2.0 SOLARMOUNT Flush Rail Version <br /> <br />PZSE, Inc. - Structural Engineers has reviewed the Unirac SOLARMOUNT rails, proprietary mounting system constructed <br />from modular parts which is intended for rooftop installation of solar photovoltaic (PV) panels; and has reviewed the U- <br />builder Online tool. This U-Builder software includes analysis for the SOLARMOUNT LIGHT rail, SOLARMOUNT <br />STANDARD rail, and SOLARMOUNT HEAVY DUTY rail with Standard and Pro Series hardware. All information, data and <br />analysis contained within are based on, and comply with the following codes and typical specifications: <br />1. Minimum Design Loads for Buildings and other Structures, ASCE/SEI 7-16 <br />2. 2019 California Building Code, by California Building Standards Commission. <br />3. 2018 International Building Code, by International Code Council, Inc. w/ Provisions from SEAOC PV-2 2017. <br />4. 2018 International Residential Code, by International Code Council, Inc. w/ Provisions from SEAOC PV-2 2017. <br />5. AC428, Acceptance Criteria for Modular Framing Systems Used to Support Photovoltaic (PV) Panels, November <br />1, 2012 by ICC-ES. <br />6. 2015 Aluminum Design Manual, by The Aluminum Association, 2015 <br /> <br />Following are typical specifications to meet the above code requirements: <br />Design Criteria: Ground Snow Load = 0 - 100 (psf) <br /> Basic Wind Speed = 85 - 190 (mph) <br /> Roof Mean Height = 0 - 60 (ft) <br /> Roof Pitch = 0 - 45 (degrees) <br /> Exposure Category = B, C & D <br />Attachment Spacing: Per U-builder Engineering report. <br />Cantilever: Maximum cantilever length is L/3, where “L” is the span noted in the U-Builder online <br />tool. <br />Clearance: 2” to 10” clear from top of roof to top of PV panel. <br />Tolerance(s): 1.0” tolerance for any specified dimension in this report is allowed for installation. <br />Installation Orientation: See SOLARMOUNT Rail Flush Installation Guide. <br />Landscape - PV Panel long dimension is parallel to ridge/eave line of roof and the PV <br />panel is mounted on the long side. <br /> Portrait - PV Panel short dimension is parallel to ridge/eave line of roof and the PV panel <br />is mounted on the short side. <br /> <br />1478 Stone Point Drive, Suite 190, Roseville, CA 95661 <br />T 916.961.3960 F 916.961.3965 W www.pzse.com <br />Experience | Integrity | Empowerment <br />March 30, 2021 <br /> <br /> <br /> <br /> <br /> <br /> <br />Components and Cladding Roof Zones: <br />The Components and Cladding Roof Zones shall be determined based on ASCE 7-05, ASCE 7-10 & 7-16 Component and <br />Cladding design. <br /> <br />Notes: 1) U-builder Online tool analysis is only for Unirac SM SOLARMOUNT Rail Flush systems only and do not <br />include roof capacity check. <br /> 2) Risk Category II per ASCE 7-16. <br /> 3) Topographic factor, kzt is 1.0. <br /> 4) Array Edge Factor ƳE = 1.5 <br /> 5) Average parapet height is 0.0 ft. <br /> 6) Wind speeds are LRFD values. <br /> 7) Attachment spacing(s) apply to a seismic design category E or less. <br /> <br />Design Responsibility: <br />The U-Builder design software is intended to be used under the responsible charge of a registered design professional <br />where required by the authority having jurisdiction. In all cases, this U-builder software should be used under the <br />direction of a design professional with sufficient structural engineering knowledge and experience to be able to: <br />• Evaluate whether the U-Builder Software is applicable to the project, and <br />• Understand and determine the appropriate values for all input parameters of the U-Builder software. <br /> <br />This letter certifies that the Unirac SM SOLARMOUNT Rails Flush, when installed according to the U-Builder engineering <br />report and the manufacture specifications, is in compliance with the above codes and loading criteria. <br /> <br />This certification excludes evaluation of the following components: <br />1) The structure to support the loads imposed on the building by the array; including, but not limited to: strength <br />and deflection of structural framing members, fastening and/or strength of roofing materials, and/or the effects <br />of snow accumulation on the structure. <br />2) The attachment of the SM SOLARMOUNT Rails to the existing structure. <br />3) The capacity of the solar module frame to resist the loads. <br /> <br />This requires additional knowledge of the building and is outside the scope of the certification of this racking system. <br /> <br />If you have any questions on the above, do not hesitate to call. <br /> <br />Prepared by: <br />PZSE, Inc. – Structural Engineers <br />Roseville, CA <br />1478 Stone Point Drive, Suite 190, Roseville, CA 95661 <br />T 916.961.3960 F 916.961.3965 W www.pzse.com <br />Experience | Integrity | Empowerment <br />REENIIGER <br />LARUTCURTS AINROFILACFOETATS <br />GNELANOISSEFORPDERETSEHCAZHTENEKL <br />N <br />AP <br />Exp. 3-31-23 <br />No. S3878 <br />R <br />U <br />DIGITAL SIGNATURE <br />2209 N Linwood <br />Ave8/22/2024