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Page 3 <br />Existing Roof Design Loading: <br />D L = 12 psf <br />LL = 25 psf <br />Existina Roof Joist 16" oc Desi n Forces: <br />DL=12psf x1.33'=16#/ft <br />LL = 25 psf x 1.33' = 34 #/ft <br />New Mech Units: <br />Heat Pump Unit = 204 # <br />Provide 4x4 x 5'-0" long spreader to span over 4 joists, <br />Each joist additional loading from the new mech units: <br />Padd=204#/4=51 # <br />New Mech Units: <br />Kitchen Hood Unit = 350 # <br />Provide support at the wall, and 2 hangers to support the unit, <br />joist additional loading from this unit: <br />Padd = 350 # /2 /2 hangers = 88 #, use 170 # for calculation conservative <br />See next page for the existing 2x12 roof joist capacity check <br />