I'll have to raise my sauna and shower floor about 8". What are the recommendations for creating a good solid raised tile floor? Vertical treated 2x8s? What about spacing? And I was planning on going with cement board on top of that, Ditra, then tile. My sauna drain will run and unite with my shower drain, which will empty into the Saniflo pump.

Any recommendations or advice? Thank you.

I need a transalation for this into "weekend novice contractor" language.

Also, the sauna will have very little water in it, so I didn't think concrete was necessary. The drain is just precautionary in case excess water is thrown on the rocks for steam. The sauna is 6.5 x 6.5, and will need 8" of depth, so I'd prefer not to mix and haul concrete for this. The tiled shower, however, will need concrete.

Thank you.

(And I accidently posted this twice thinking the first didn't go through)

P.T. = pressure treated

For further protection from the moisture that is always coming up through the floor, place the p.t. joists on strips of 6 mm thick polyethylene sheeting. It comes in black rolls about 10 in. wide.

Instead of the traditional mud base for your shower, you can use pre-formed foam bases and drains from Schluter.

The system is pricey but is easy to put down and no bags of heavy materials to haul in.

Even if you choose not to use the pre-formed base, you can used the Kerdi membrane over everything.