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PPlurefight <br /> October 06, 2023 <br /> Subject: Proposed Solar Panel Installation <br /> Jason Goodrich Residence, 4920 Colby Ave, Everett, WA <br /> To Whom it May Concern, <br /> Our engineering department has reviewed information, gathered by our field crews, related to the proposed solar <br /> panel installation at the above-referenced address. The purpose of our review was to determine the structural <br /> adequacy of the existing roof. Based on our review and analysis of the available information, and in accordance <br /> with governing building codes, it is our professional opinion that the existing structure is permitted to remain <br /> unaltered for the proposed solar installation. <br /> Design Parameter Summary <br /> Governing Building Code: 2018 Washington Building Code (2018 IBC) <br /> Risk Category: II <br /> Design Wind Speed: 110 mph (per ASCE 7-16) <br /> Ground Snow Load: 15 psf <br /> Roof Information <br /> Roof Structure: 2x4 Rafters @ 24" O.C. <br /> Roofing Material: Asphalt Shingles (1 layer) <br /> Roof Slope: 23 degrees <br /> Roof Connection Details <br /> RT Minis into 2x rafters/chords, or decking, at 48" O.C.; install per design drawings and manufacturer specs <br /> Locations per design drawings <br /> Note:Required embedment length excludes the tapered tip of the screw, and embedment into sheathing. <br /> Analysis <br /> The proposed installation complies with the requirements of WAC Section 51-51-03240 R324.4 (Exception) and is <br /> therefore deemed adequate to support the load of the rooftop solar system. <br />