I would like to build a 14'X 20' single story workshop at the rear of my home in Indiana. It would be very difficult to pour a traditional concrete foundation due to site access, tree roots, and wooden privacy fence.
Sink several 6x6 treated posts in holes filled with quick set concrete around the perimeter of the struture. Build a platform supported from these posts with conventional constructions from that point up.
Lay 20' long 6x6 treated posts on the ground evenly spaced on concrete pavers. Build a floor structure on top of the beams, then conventional construction from that point up. (possibly lay a thick piece of plastic sheeting on the ground between the wood and ground?)
The approx. distance from the top of the floor to the ground would be around 12-15"
Any advise or suggestions would be greatly appricated.