Re: Removing Floors
The plywood in my bus was attached with special fluted nails. The nails were attached to the floor pretty well by rust as well. I found that a large chisel and a 6' long pry bar was the key to getting the plywood up in large chunks and sometimes even in one piece. First I would hammer the chisel under the edge, maintain the torsion by inserting some object (bricks, logs, or whatever), and then come in with the pry bar. I'm sure this would work with screws too, since the wood just rips over the head. Then you go in with a claw hammer or crowbar to pull out the nails; or if screws take your pick of vice grips or angle grinder, etc.