HVAC equipment dead load
HVAC equipment dead load
(OP)
Hello all,
Will looking at a set of prints, architectural, they called for a roof dead load of the HVAC equipment at 4 PSF.
Please correct me if I am wrong here but Pounds Per Square foot is calculated by weight / area in feet. So if the rooftop unit had a weight of 1000 lb and had a dimension of 8’x 5’ the PSF would be 25 PSF.
My question is “Did I calculate something wrong here?” By my calculations I would only be able to install something the size of a residential condenser on this roof.
This is an 8,000 square foot store that’s parts of a strip mall. What am I missing here?
There are currently no mechanical drawings.
Thanks
Will looking at a set of prints, architectural, they called for a roof dead load of the HVAC equipment at 4 PSF.
Please correct me if I am wrong here but Pounds Per Square foot is calculated by weight / area in feet. So if the rooftop unit had a weight of 1000 lb and had a dimension of 8’x 5’ the PSF would be 25 PSF.
My question is “Did I calculate something wrong here?” By my calculations I would only be able to install something the size of a residential condenser on this roof.
This is an 8,000 square foot store that’s parts of a strip mall. What am I missing here?
There are currently no mechanical drawings.
Thanks






RE: HVAC equipment dead load
RE: HVAC equipment dead load
For specific units that weigh higher, there should be some indication on the plans as to where these units can be located - usually with special, stronger framing to support them. If you don't see anything indicated for the heavier units (like what JStephen suggests) then call the engineer.
RE: HVAC equipment dead load
RE: HVAC equipment dead load
When significantly larger unit weights come into play, such as those frequently encountered with industrial bldg. or industrial platform or mezzanine designs, then the method of collateral load determination must be looked at more closely, and will lean toward the more intuitive method that you used initially (i.e. 25psf).