In a few weeks, I will have some guys come over to pump out EPS concrete on 60 m2. The initial plan was to lay EPS concrete over the entire surface, level it, and then build the interior walls. However, I encounter a problem if I do it this way. One of the rooms is supposed to be a bathroom, and here I need less EPS concrete to create a slope later. If I build the interior walls before the EPS concrete, they will sit directly on the concrete slab (non-insulated against the basement), but it will be significantly easier with the EPS concrete (different levels on each side of the wall).

I would prefer to get the EPS out without "thermal bridges" so is there another way to accomplish this? For example, placing insulation foam where the interior walls will stand, spreading the EPS concrete. Let the insulation foam remain or alternatively remove the foam and fill with EPS concrete?
 
Have to abandon the idea of using Styrofoam. Can't get around the problem, facing the same issue with the self-leveling compound, and if I use Styrofoam, I would want it under the self-leveling compound. So, the following options remain:
* Use steel tracks/steel studs directly on the concrete slab. In that case, I need to place boards before the EPS concrete.
* Build a row with Leca blocks closest to the concrete slab. After casting, I build the interior wall normally on the Leca foundation.
The main reason I've hesitated to use studs directly on the concrete slab is that it's not even, and there are steel beams protruding about 3 cm. What do you think?
 
But it's not a problem if it's a basement, then it's fairly warm there, at least above freezing. Frame the wall where you need it, put something, like plastic, 10mm cell plastic or OSB, so the EPS doesn't run in the wall and go for it.
 
nino nino said:
But it's no problem if it's a basement, it's fairly warm there, at least above freezing. Frame the wall where you want it, add something, like plastic, 10mm foam or OSB, so the EPS doesn't run into the wall and just go for it
The problem with framing a wall can be seen in the attached picture. Most of the inner wall will run across the steel beams, a metal track will only rest on the steel beams (70-80 cm CC) but maybe that's enough? Will have to test how it turns out.
 
  • Floor with steel beams for wall framing, construction tools scattered on the wooden floor, highlighting the challenge of aligning an interior wall with beams.
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