I have a room in the basement available after installing a heat pump and I'm in the planning stage to decorate this into a relaxation area/sauna. But I'm wondering about what to do with the walls. They are currently plastered stone walls/external walls. You probably want some kind of ventilation behind the new wall/tiles, right?
How much air space is needed? Does anyone know where there are designs to look at to see roughly what it should look like and what materials are needed to build with?
Same question regarding the floor, currently a standard stone floor directly on the slab.
Kind regards, Andreas