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• <br /> Bruce S. MacVeigh,P.E. <br /> Civil Engineer/Small Site Geotechnical <br /> 14245 59th Ave. S. <br /> Tukwila, WA 98168 <br /> Cell Ph: 206-571-8794 <br /> September 16, 2019 (Revision) <br /> Subject: Roof-Mounted Unit and Hood Evaluation, Pizza Hut, 10121 <br /> Evergreen Way, Suite 23, Everett, WA 98204 <br /> General. <br /> The existing building will receive new/upgraded roof-mounted restaurant <br /> related units and new interior kitchen hoods. Also, one roof-mounted <br /> HVAC unit will be replaced at same location and a new one installed with <br /> similar installation. It is a one-story tenant unit in an existing building. The <br /> layout of the existing roof has been verified by field measurement. <br /> Weights of units are per manufacturer. Documentation is attached. <br /> Comments/Evaluation Results. <br /> 1. The tenant space is 21' 8"wide and 60 feet long. A major glulam beam <br /> crosses the space 20 feet to the front of the rear wall. Running front to <br /> back are 2" x 4" (Paralam LVL) by 36" high wood roof trusses at 4 foot <br /> spacing. Note the glulam (7.5"wide by 32" deep) is judged adequate <br /> without evaluation. All new units evaluated will be in the front 40 feet of <br /> the space. <br /> 2. Per attached calculations the 36" high roof trusses in the front 40 feet <br /> of the building have no additional moment capacity beyond existing basic <br /> roof loading. The trusses are open lattice 2.0 Paralam LVL (Truss Chord <br /> rated) top and bottom chord and cannot be reinforced to provide additional <br /> moment capacity. The solution is to block beneath the trusses with mid- <br /> span cross-beams with posts in the new building internal front-to-back wall <br /> and side walls. The solid post blocking will reduce the effective span for <br /> the trusses from 40 feet down to about 28 foot maximum span. With the <br /> added post and cross beam blocking under affected trusses (assumed all <br /> trusses), the two new Exhaust Fans#1.and#2 may be installed without <br /> otherwise altering the roof structure. Similarly,the new Makeup Air(MUA) <br /> may be safely installed. <br /> 3. The Makeup Air(MUA) fan for the main hood has a substantial weight <br /> (with air tempering(heating)feature) of about 500#. With all affected roof <br /> trusses having a shortened span with the support blocking, it may be <br /> installed without otherwise altering the roof structure. <br /> 21 <br />