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• <br /> • <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 4, 2019 <br /> Subject: Roof-Mounted Unit and Hood Evaluation, Pizza Hut, 10121 Evergreen <br /> Way, Suite 23, Everett, WA 98204 <br /> General. <br /> The existing building will receive new/upgraded roof-mounted restaurant related <br /> units and new interior kitchen hoods. Also, one roof-mounted HVAC unit will be <br /> replaced at same location and a new one installed with similar installation. It is <br /> a one-story tenant unit in an existing building. The layout of the existing roof <br /> has been verified by field measurement. Weights of units are per manufacturer. <br /> 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 rear of the front wall. Running front to back are <br /> 2" x 4" by 36" high wood roof trusses at 4 foot spacing. Note the glulam (7.5" <br /> wide by 32" deep) is judged adequate without evaluation. All new units <br /> evaluated will be in the front 40 feet of the space. <br /> 2. Per attached calculations the 36"high roof trusses in the front 40 feet of the <br /> building have no additional moment capacity beyond existing basic roof loading. <br /> The trusses are open lattice 2.0 Paralam LVL (Truss Chord rated)top and <br /> bottom chord and cannot be reinforced. The solution is to block beneath the <br /> trusses with additional loading with posts in the new building internal cross <br /> walls. The solid post blocking wilt reduce the effective span for the trusses from <br /> 40 feet down to about 25 foot maximum span. With the added post blocking <br /> under each affected truss, the two new Exhaust Fans#1 and#2 may be <br /> installed without otherwise altering the roof structure. <br /> 3. The Makeup Air(MUA)fan for the main hood has a substantial weight (with <br /> air tempering (heating)feature) of about 500#. Withal! affected roof trusses <br /> having a shortened span with the support blocking, it may be installed without <br /> otherwise altering the roof structure. <br /> 4. Important in the above unit evaluation is that they are each equally <br /> supported by two roof trusses (or close to it), per usual construction practice. <br /> Provided is a working sketch showing wood roof curbing recommended to <br /> ensure two trusses support each unit. <br /> \ 120 <br />