Abstract: A storage/utility building comprises one or more modular arches with sidewall, mid roof and top roof panels on a skeletal structure defining a truss-free gambrel construction as a whole which can support at least 100 lbs. per sq. ft. live load, and substantially more, and more particularly comprises in the skeletal frame two end gambrel arches made up of framing members of bent sheet metal or extruded form with spanning purlins between the two end frames, the purlins also being of bent sheet metal or extruded form.