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20 RIGHT ANGLE ENGINEERING <br /> STRUCTURAL CERTIFICATION REPORT <br /> Roof-mounted Solar Panels <br /> April 23, 2024 <br /> To: Blue Raven Solar Re: Judy Bryant-967863 <br /> 1403 North Research Way 1327 Oakes Ave <br /> Orem, UT 84097 Everett, WA 98201 <br /> AHJ: Everett(City), WA <br /> Blue Raven Solar proposes to install new roof-mounted solar panels at this residence 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 Residential Code 2021 <br /> Design Standards: ASCE 7-16 <br /> Snow: Ground: pg= 25.0 psf Flat Roof: pf= 17.33 psf(unreduced) <br /> Wind: Ultimate Wind Speed = 110.0 mph Exposure = C <br /> Seismic: Risk Category = 2 Seismic Design Category = D Site Class = D <br /> STRUCTURE <br /> Field Technicians from Blue Raven Solar visited the site and observed the existing structure <br /> Array Name Panel Quantity Roof Framing Material Pitch <br /> Array 1 9 2x4 Rafter 16" o.c. Asphalt Shingles 26° <br /> House <br /> Array 2 <br /> Detached 6 2x4 Rafter 16" o.c. Asphalt Shingles 26° <br /> Garage <br /> ANCHORAGE <br /> The solar panel anchorage shall be installed according to the manufacturer's most current installation manual. <br /> Anchorage shall be staggered to distribute the load evenly to adjacent roof members. The solar panels should be <br /> mounted parallel (max 10 inches)to the roof surface. <br /> Array Name Connection Type Fastener Max Anchorage Spacing <br /> Array 1 5/16" lag screw (2.5" <br /> House Flashkit Pro embedment) into roof 48" <br /> substructure <br /> Array 2 5/16" lag screw (2.5" <br /> Detached Flashkit Pro embedment) into roof 48" <br /> Garage substructure <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. Deviations from the approved structural plans (including equipment substitutions)are not <br /> allowed without written approval from Right Angle Engineering. Prior to installation, the installer should: <br /> • Confirm that the existing structure matches the information provided in the structural survey, the approved <br /> installation 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 /> 581 E Technology Ave, C1500 Orem, UT 84097 925-787-3067 www.rightangleeng.com Page of <br />