I am working on a multi-family residential project were it is still too soon to determine the HVAC equipment, and I am trying to get calcs out for the dead load at the roof and start sizing some wood members. Most of my experience comes from the commercial side, were we also deal with this and we usually assume an equipment area and use 50psf dead load over the roof dead load itself to cover us for all possible equipment and begin sizing members. what would your recommendations be to make a safe assumption about the dead load from equipment? is 50psf overkilled for residential?
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