OK, here's what I did. I poured a concrete floor which will be polished and used as the finished surface in the bathroom. Where the tub would be, I sloped the floor towards a previously installed shower drain/pan attachment. I had the plumbers install a shower pan, as if we were constructing a curbless shower/handicap shower, with no curb on the two outer walls. I then formed the two outer walls with plywood. Within that I constructed a cage of fiberglass rebar, and carbon fiber mesh. To that I attached pex tubing, fed by the hot water heating system, for nice warm baths all winter, and then I suspended a well reinforced plywood insert to form the interior of the tub.
I used a special concrete including several additives to give a strong, dense, waterproof mix, even without surface or penetrating sealers. The tub will be a dark graphite color and the floor a natural concrete. Both will be polished to a high gloss. I'll let you know how well it holds water. |
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