I was thinking of using 4 rolls of 300ft 1/2 pex. I built one awhile ago near here that was 22X38 and thought I used 4 rolls then.
I know theres a calculator somewhere to give you a good guess. But why not use all 3 rolls? I would think plumbing the commode on a piece of plywood would eliminate any melting of the wax ring.
|