We got one from Sam's club, I built a treated wood "deck" as a foundation using deck planking instead of plywood as the directions showed. I screwed the plastic floor down to the wood with lag bolts with large washers on them after it was totally built. Between those and the very heavy antique Cub Cadet garden tractor parked in there, I dont think its going anywhere. The floor has held up fine to the just over 800lbs tractor and other stuff thats in there. I still need to run power out there for the lights I put in. If it holds up as good as our mailbox, which is made from the same type of material, it should outlast any wood shed.