806 SE EVERETT MALL WAY 2017-06-20

SITTS & HILL ENGINEERS, INC. Professional Engineers and Planners BRENT K.LESLIE',P.E. 4815 Center Street,Tacoma,WA 98409 KATHY A.HARGRAVE,P.E. www.sitts-hill-engineers.com LARRY G. LINDELL,P.E. (253)474-9449 MICHAEL A.McEVILLY, P.L.S. April, 24, 2017 TRUE REFRIGERATION UNLIMITED 11227217 TH Street Court East Graham, Washington 98338 TO: Alex Sorkirkin SUBJECT: ANALYSIS OF EXISTING ROOF FOR REPLACEMENT HVAC UNITS — APPLEBEE'S RESTAURANT, LOCATED AT 806 EVERETT MALL WAY, EVERETT, WASHINGTON SITTS AND HILL PROJECT NUMBER 17322 Dear Alex, We understand that you are proposing to replace four existing rooftop mounted air handling units at 806 Everett Mall Way in Everett, Washington. The existing roof structure consists of steel bar joists supporting a metal deck, insulation and roof membrane. The joists are spaced at approximately 5 ft. on center and span approximately 45-0" between supports. Our analysis is based on the equipment information you provided and field measurements. Units RTU-1 and RTU-3: • Existing units are Carrier 48TJD008 7.5 Ton units weighing approximately 1,080 lbs. each. • Proposed units are York ZYG08 7.5 Ton units weighing 1,050 lbs. each. • Units will be mounted in the same location as existing equipment. No curb adapter will be installed. Since the proposed units weigh less than the existing units, the roof structure is adequate by inspection for these two units. Unit RTU-2 and RTU-4: • Existing units are Carrier 48TJD007 6 ton units weighing approximately 736 lbs. • Proposed unit is a York ZF07 6.5 ton unit weighing approximately 1,055 lbs., with a curb adapter that weighs an additional 255 lbs. • Based on the field measurements the steel bar joists most closely match a Vulcraft 281<10 bar joist. Joist capacity was based on the rating published in Vulcraft's catalog. • The proposed unit will be mounted on a curb that distributes the unit load over 2 roof joists. The units will be located approximately 9 ft. from the West edge of the roof and 16 ft. from the East edge. • A roof snow load of 25 PSF was used in our analysis. The RTU-2 and RTU-4 unit loads resulted in an increase of approximately 5.6% in joist moment and 3.6% in joist shear. Based on our review of the roof, the existing joists are structurally acceptable to support the proposed replacement units. Civil, Structural and Survey