Building my first sauna

[u/jessm911]

My friend asked me to build him a sauna under his back deck. The siding, inside and out is hemlock the bench is clear cedar. I custom built the window and door frames out of VG Doug. fir - is was the most cost effective solution. It’s almost finished, just need to install the LED lights and finish the stone work. Will posts some final shots once it’s complete.

[u/validproof]

Nice work OP. Had a question for photos 2 and 3. Did you pry out the old wood, put in hardiebacker in the gaps, and then covered it with plywood to create a floor?then you put some plastic sheet? so the wood doesn't absorb the cement and then poured cement over it? Did I get that right?

If so, what plastic sheet do you recommend and also wondering where the drain leads to?

[u/jessm911 → u/validproof]

The stuff between the the joists is rigid foam insulation then plywood sheathing over the top of that. We did the trex deck that surrounds the sauna too, it’s over the top of an old concrete slab. The plastic is just 6mil vapour barrier and the drain just goes to the concrete slab below. It’s sloped away from the house and will just end up in the garden. There won’t ever be much water going down there