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Existing Roof Design Loading: <br />D L = 12 psf <br />LL = 25 psf <br />Existing Roof Joist @ 16" oc Design Forces: <br />DL=12psf x2'=24#/ft <br />LL=25psf x2'=50#/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 addition new loading from the new mech units: <br />Padd = 204 # /4 = 51 # <br />See next page for the existing 2x12 roof joist capacity check <br />