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E RIGHT ANGLE ENGINEERING <br /> STRUCTURAL CERTIFICATION REPORT <br /> Roof-mounted Solar Panels <br /> October 22, 2025 <br /> To: All Energy Solar Re: David Hong 98907 <br /> 1264 Energy Lane 28993 Voyager Rd <br /> St. Paul, MN 55108 Danbury,WI 54830 <br /> AHJ: Burnett(County), WI <br /> All Energy Solar proposes to install new roof-mounted solar panels at this structure and asked Right Angle Engineering <br /> to review the existing structure for suitability. This letter summarizes the methods that were used to survey, evaluate, and <br /> certify the existing roof framing and the attachment of the new solar panels to it. <br /> STRUCTURAL DESIGN <br /> Building Code: International Building Code 2015 <br /> Design Standards: ASCE 7-10 <br /> Snow: Ground: p9=30.0 psf Flat Roof: pf= 18.09 psf Sloped Roof: ps= 15.68 psf <br /> Wind: Basic Wind Speed = 107.0 mph Exposure = C <br /> Seismic: Risk Category= 1 Seismic Design Category= B Site Class = D <br /> STRUCTURE <br /> Right Angle Engineering performed a virtual site inspection of the roof structure and observed the following: <br /> Array Name Panel Quantity Roof Framing Material Pitch <br /> Array 1 18 3.0x3.0 Purlin 24"o.c. Corrugated Metal 18° <br /> ANCHORAGE <br /> The solar panel anchorage shall be installed according to the manufacturer's most current installation manual.The <br /> attachment configuration should match the certified building plans. The solar panels should be mounted parallel (max 5 <br /> inches)to the roof surface. <br /> Array Name Connection Type Fastener Max Anchorage Spacing <br /> Array 1 Solar Foot(into 22 gauge steel) (4) 1/4 tek self tapping 48„ <br /> screws into 22 ga steel <br /> Installation Instructions <br /> Solar panels and the equipment shall be installed per the manufacturer's installation specifications. Improper installation <br /> will void this certification. If deviations from the approved structural plans occur, Right Angle Engineering must be <br /> notified. Prior to installation, the installer should: <br /> • Confirm that the existing structure matches the information provided in the site survey, the approved installation <br /> plans and this certification. <br /> • Identify discrepancies between this certification and the approved installation plans. If found, then this <br /> certification shall govern. <br /> • Identify structural elements that are dangerous(cracked, broken, excessive sag, signs of overstress, rot, decay, <br /> fire,water). If found, installation shall cease until those elements are adequately abated and made to comply with <br /> the referenced building code. <br /> • Verify that both the existing structure and the solar addition has been permitted through the AHJ. <br /> • The installer should not walk directly on the metal roof unless there is a structural member directly beneath them. <br /> • All snow retention systems below the solar arrays must be removed in order for the snow to slide off the roof <br /> freely. <br /> 757 Technology Ave, F31 Orem, UT 84097 925-787-3067 www.rightangleeng.com Page of <br />