I am renovating the bathroom and recently created a thread with some questions about plumbing. That thread quickly turned into trying to convince me not to frame up the floor but instead to pour it up with concrete or self-leveling compound. To get some more input on the issue, I thought I'd create a new thread with a better title for the topic.
I have a concrete slab that is roughly poured and quite uneven. The finished floor level should be about 15cm above the slab. Therefore, I had planned to frame up a floor that ends up about 3cm below the finished level and then level the slope with self-leveling compound.
In the old thread, there were some who thought I should insulate with isodrän at the bottom or mix self-leveling compound and leca beans to raise it high enough that you can just level the slope in the final layer.
What do you all think? Am I stupid for wanting to frame up a floor instead of somehow casting all the way from the slab?
I attach a small picture of how it looks. What makes me most skeptical about pouring concrete is that I will encase the sill and also a bottom beam for the wall against the adjacent room. Isn't it quite foolish to encase the sill or is it okay? Hopefully, no moisture should come against the sill after the pouring, but it's still good if the construction can breathe, right?
How did you do it? I'm considering the same thing now
I chose to cast with EPS concrete and level the underfloor heating with floor leveling compound for the last 30 millimeters. It worked great and since then I've done the same thing in a smaller WC with the same good results.
The trickiest part in the bathroom was setting up guide rails so I could pull off the EPS concrete straight and even. I ended up casting three small blocks of concrete, about 20x20 cm, and placed a straight pipe in the moist concrete. I cast two identical pipes on each side of the bathroom, and when I pressed them into the moist concrete, I could level them perfectly and at exactly the height I wanted them at. It took a bit of extra effort to do this, but it significantly helped when laying the EPS by having fixed guide rails to pull against to quickly and easily get a straight result to work from for the floor leveling.
Thinking about doing the same thing. Do you have an insulated slab from the start? Or did you cast in some foam insulation? I have an uninsulated slab, so it's a bit complicated since I want underfloor heating. How thick did you cast?
I have a basement under my bathroom so insulation is not necessary in my case. But just as you mentioned, there is insulation in EPS so it should solve your problems.
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