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• <br /> CT ENGINEERING <br /> INC. 180 Nickerson St. <br /> Suite 302 <br /> Seattle,WA 98109 <br /> (206)285-4512(V) <br /> (206)285-06I8(F) <br /> May 28th,2020 <br /> City of Everett Permit Services <br /> Attn:Drew Martin,Associate Engineer—Commercial Plans Examiner <br /> 3200 Cedar Street, 2nd Floor <br /> Everett, WA 98201 <br /> Re: Dr.Kang RTU Replacement <br /> 3822 Colby Ave. <br /> Everett,WA <br /> Dear Mr.Martin: <br /> Please find structural responses to the following review comments received in both an April 23rd and April 24th <br /> email from you. The round bullets are our responses to your comments. <br /> April 23rd: <br /> I reviewed the submittal documents for this project. The roof plan indicates the trusses are supported by a <br /> glulam at one end and unconfirmed framing at the other. Based on the location of the replacement units, most <br /> of the load is anticipated to be on the glulam. Please address the following: <br /> 1. Submit calculations verging the glulam beam is adequate for the loads. <br /> • Please find supplemental beam calculations attached per your request. Please note that per <br /> both our field observations as well as review of the construction documents on line,we have <br /> determined that the beams at the roof level are 5 1/8 X 16 '/a GLB's. Please note that the roof <br /> framing members to the west of the beams directly supporting the mechanical units are shown <br /> in the on-line documents as 2x12's which agree with our field measurements. Based on the <br /> photo previously sent via email,there is roughly 5"of beam below the 2x12 joist, <br /> precipitating the 16 '/2" depth. The beam width was verified in the field to be 5 1/8". We were <br /> not able to clearly read the existing beams at the main story framing level,however we have <br /> provided minimum beam sizes based on our calculations for the contractor to verify during <br /> construction. <br /> 2. Provide additional information for the other wall line clarifying the framing. At a minimum, calculate <br /> the increased load to this wall line. My principal concern is verifying there isn't a weak link here. <br /> • We have determined that the load increase to this wall line is 8 lb/foot along the length of the <br /> 10 foot units. Therefore,each new unit increases the load to this wall line by 80 lb. This <br /> increase is ok by inspection,however I was able to determine a section through some of the <br /> original construction documents that show a beam adjacent the framing studs along this line, <br /> so the existing condition does not seem to consist of a bunch of slender wood studs supporting <br /> the roof load,the beam element will continue to support these gravity loads in this location. <br /> Pagel 1 `\0 <br />