I have a shop and tractor shed that are pole buildings with Truss roof. I want to know how much weight I can safely hang from the bottom (joist?) of the truss. I don't want to pull an engine block, but may have needs to hang things from time to time. I have the spec for my Truss, but I don't know how to read it. BCDL (botom chord dead load) is listed at 5.0 psf. I hope that does not mean I can only hang 5 lbs, because I think the lights weigh that much. There is other data on the spec, so let me know if I can provide more info.