Am in the design stages of building a stand-alone exterior sauna (approx dimensions being 8x8x7). Will be constructing a mostly cedar structure that will be built with Eastern White cedar (2x4, 2x6, clapboard siding, and tongue & groove 1x4 interior boards).
I've seen several designs that use a similar stick construction with insulation between the studs and foil vapour barrier beneath the tongue and groove interior boards. In respect to the floor design, since the sauna will not be flush to the ground (in order to construct it at the same height as my existing deck), a concrete floor is not an option. Instead, I'll be framing a typical 2x6 or 2x8 joist floor.
My question is if I should build the floor with foil vapour barrier and cedar tongue and groove boards, the same way as the walls or if this would be problematic down the road. See picture example below:
I'll be installing an 8 to 10 kw heater that will be used for wet sauna use. Will the cedar floor work in this application or should I explore some sort of rubber or vinyl sub-flooring with removable cedar decking on top?
Thanks for looking.