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Mr. Kenny Keck <br /> Lynden Sheet Metal <br /> Plan Check Number: M2107-048, First Building Review <br /> July 22, 2021 <br /> Comments <br /> 1. The project involves structural modifications to the existing roof. A separate building permit <br /> application is required including revised structural drawings and calculations. Additional <br /> comments may be pending. The following preliminary comments should be addressed: <br /> a. Opening locations on Sheet S1 do not appear consistent with the mechanical plans, notably <br /> for the MUA duct. The locations should be revised as needed. See IBC Section 107.2.1. <br /> b. The structural calculations evaluating the roof trusses do not appear to be included and <br /> should be submitted for review. See IBC Sections 1604.1 and 1604.4. <br /> c. The design loads considered in the structural calculations are not clear. The load schedule <br /> in the calculations appear to include deck and floor loads, which is not applicable, and no <br /> snow loading. The applicable loads should be dead (i.e., self-weight and mechanical <br /> equipment, including the hoods below) and snow loading. Revised calculations should be <br /> submitted for review. See IMC Sections 1603.1 and 1605. <br /> 2. Sheet M-1 states that the Type I hood is constructed to allow a zero-clearance installation. The <br /> equipment sections on CaptiveAire Sheet 2 show insulation on the top and back, but the plan <br /> view does not indicate insulation is provided on the sides. Sheet 2 should be revised to show <br /> insulation on the sides, or the 18-inch clearance must be provided. See IMC Section 507.2.6. <br /> 3. Continuing with the previous comment, zero-clearance hoods are required to include a non- <br /> absorbent material behind the hood and extending at least 18 inches in all directions. The <br /> should be specified in the drawings. See IMC Section 507.2.6 Exception 1. <br /> 4. The building section on Sheet M-1 includes a note for the exhaust duct stating "Fire wrap <br /> terminates at the end of curb. Remaining duct on roof will stay 18"away from combustibles". <br /> The wrap should continue along the duct if the curb is combustible. In addition, the section <br /> should specify a minimum 18-inch clearance to be maintained between the duct and the roof. <br /> A detail clarifying the duct penetration through the roof and the"curb"should be included. See <br /> IBC Section 107.2.1 and IMC Section 506.3.6. <br /> This review has been performed for general compliance with the building codes as adopted and <br /> amended by the state of Washington and the city of Everett. Corrections and comments made <br /> during the review process do not relieve the project from compliance with code and permit <br /> requirements. The designers-of-record are responsible for a complete design in accordance with <br /> the laws of the state of Washington. <br /> If you have any questions or require additional clarification, please contact us. <br /> Respectfully, <br /> Drew Martin, P.E., S.E. <br /> Associate Engineer/ Commercial Plans Examiner <br /> (425)257-8813 <br /> dmartin@everettwa.gov <br /> S:\BMa rti n\2021\M 2107-048_R 1.docx <br /> O3200 Cedar Street © 425.257.8810 O everetteps@everettwa.gov <br /> Everett,WA 98201 425.257.8857 fax everettwa.gov/permits <br /> Page 2 of 2 <br />