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11 RIGHT ANGLE ENGINEERING <br />August 29, 2022 <br />Solar Wholesale <br />4158 W Nike Dr Ste B <br />West Jordan, Utah, 84088 <br />Design Criteria: <br />Wind Speed (Vnit) - 110.0 mph <br />Ground Snow Load - 25.0 psf <br />Risk Category - 2 <br />Exposure Category - C <br />RE: Structural Roof Evaluation for the Arlon Owensby Residence: 4628 W View Dr, Everett, <br />Washington <br />We have evaluated the roof structure under the proposed solar panel array. The information used to <br />evaluate this structure was gathered during a field visit by Solar Wholesale on behalf of Right Angle <br />Engineering. The design criteria used to analyze this structure are listed above and included with this <br />letter. The adopted building codes in this jurisdiction are: The 2018 International Residential code and <br />ASCE 7-16. <br />tray Name Connection Type Panel Quantity Min # Connections Reinforcement <br />Array 1 L-Foot 6 11 None <br />Array L-Foot 6 11 None <br />Array 3 L-Foot 24 44 None <br />Solar Panel Anchorage <br />The solar panel anchorage shall be installed according to the manufactures most current installation <br />manual. For the loads to be evenly distributed, the roof attachments should be staggered and spread <br />evenly throughout the panel array. Attachment points should be spaced at a maximum of 48 inches on <br />center. Roof anchors that are attached to the substructure should have a 5116" or 18/8 SS lag screw with <br />2.5" minimum penetration centered on each truss top chord or rafter. <br />Conclusion <br />Based on our assessment, we have determined that the existing roof framing is in good condition and <br />will safely and adequately support the additional loads imposed by the solar panels without <br />reinforcement. The equipment will not create a negative impact on the building's structural design, <br />including any additional loads imposed (dead,snow, wind/seismic). A roof evaluation was performed with <br />the required loading in accordance with section 324.4 of the Residential Code <br />Regards, <br />08/29/2022 <br />Peter Leichliter, <br />580 E Technology Ave, Suite 200, Orem, UT 84097 385.482.1266 rightangleeng.com <br />