Today we got a early start and built the Foundation for our tiny house. It came out really good and the only brand new materials we bought was some half inch plywood, spray foam, and some long screws. The 2×4’s were purchased at a recycled salvage yard for 100 dollars. We used the vinyl we had to water proof and bug proof our subfloor. The whole floor was spray foamed, insulated and covered with half inch plywood.