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I want to build a full span room in a 50x100 metal building that has a 5/12 pitch roof. I'd like to cover the ceiling with lite-weight drywall. Could I screw 2x4's flat and perpendicular to the metal purlins every 24" and then attach drywall to the 2x4's? The steel purlins are 36" OC.

I'm researching doing my own concrete work for a 40x70 slab to save some labor costs. I've gotten bids in the range of $4.00 to $4.50 sq/ft for a 4" slab, 8" x 24" perimeter footer. The quotes include #3 and #4 rebar 18" O.C. and 3500 psi concrete. The non-labor costs including concrete, rebar...