Laserfiche WebLink
• <br /> Mr. Kenny Keck <br /> Lynden Sheet Metal <br /> Plan Check Number: M2107-048, Second Building Review <br /> August 27, 2021 <br /> Comments <br /> 1c. The response states that the zero-clearance insulation is not required due to the steel stud wall <br /> construction per the Hood Plan on Sheet M1. Please note the following <br /> a. It appears that this wall is new construction, which requires a building permit application. <br /> The building permit must be submitted and approved prior to issuing the mechanical permit. <br /> b. The excerpted NFPA language provided in the response letter does not appear consistent <br /> with Section 4.2.3 in the current edition of NFPA 96. In addition, the cited method <br /> specifically relates to"limited combustible materials"which is defined in Section 3.3. The <br /> omission of the zero-clearance insulation in the hood is only permitted if the appropriate <br /> wall construction is provided for a minimum of 18 inches. Otherwise, insulation or a <br /> minimum 18-inch clearance is required as stated in the original comment. <br /> Architectural <br /> 5. The revised design includes construction of an independent gravity load framing. A separate <br /> building permit application is required for the structural work. The building permit must be <br /> submitted and approved prior to issuing the mechanical permit. <br /> 6. The following comments should be addressed for the new beams supporting the mechanical <br /> units: <br /> a. The new beam framing is intended to support only the mechanical units per Detail A/S2. <br /> However, the beams and walls do not appear to be provided with structural gaps to prevent <br /> loading of the beams by the roof due to deflections (e.g., snow load, etc.). The new <br /> framing should be vertically independent, including at the roof sheathing. <br /> b. The beams should be evaluated for unsupported lengths equal to the clear spans. Lateral <br /> support by the existing structure is not permitted unless it is provided in such a way to <br /> prevent the transfer of vertical loads per the previous comment. <br /> c. The support walls and bracing should be provided in both orthogonal directions. Wall <br /> appear to be provided in only one direction per Detail A/S2. <br /> d. Continuing with the previous comment, the beams should be designed for lateral and <br /> vertical seismic loads concurrently with the gravity loads. <br /> e. The structural drawings do not appear to include connections details to the existing walls. <br /> Details should be included in the drawings. Calculations substantiating the connection <br /> design should be submitted for review. The connection design should consider concurrent <br /> vertical and lateral seismic loads with the gravity loads. <br /> f. The vertical framing supporting each ends of the beams should be clearly defined in the <br /> structural drawings. Calculations substantiating the capacity of the supports, including <br /> existing loads where existing framing is utilized, should be submitted for review. <br /> g. Supplemental framing to support the existing roof sheathing at the duct penetrations should <br /> be provided. The supplemental framing should allow independent vertical movement. <br /> 7. Mechanical units are located on sloped roofs and may require access platforms and guards for <br /> maintenance per IMC Section 306.5.1. The slope of the roof should be specified. If a platform <br /> is required, this work should be included as part of the building permit unless it is integral <br /> constructed as part of the mechanical equipment. <br /> V 3200 Cedar Street O 425.257.8810 O everetteps@everettwa.gov <br /> Everett,WA 98201 425.257.8857 fax everettwa.gov/permits <br /> Page 2 of 3 <br />