Originally Posted by CC08
Iíve seen a lot of pros and cons to framing the bus floor. Lately Iíve been seeing people gluing insulation down and then plywood right on top of it. We are trying to save inches as we arenít doing a roof raise. Tell me if you framed the floor or skipped it! Iím wondering what you bolted your furniture to, if you did skip the framing.
Doing a free-floating floor or doing "joists" (essentially wooden furring strips on the floor with cut strips of foam in between) won't really affect the height of your floor, which is determined by the height of the insulation + the height of your flooring (plywood + vinyl sheeting, for example) in both cases. Except insofar as wood is not as good an insulator as foam (about R1 per inch vs. R4), so the more of your layer underneath the plywood is composed of the wood furring strips instead of foam, the less good its insulation factor will be (this is pretty minor though).
Not all foams have the same resistance to compression, however, so they're theoretically not all suitable for a floating floor (although I've seen all of them used in this way).