Hello!

I have just bought a brick house from 1962, a one-story with a basement. As a result of moisture detection in one of the basement rooms, the previous owner ripped up the floor and removed the entire joist structure in the affected room. After this, fungicide was applied, a Platon membrane was laid down, filled with EPS insulation, laid a floorboard, and then laminate flooring. The wall is now also re-drained with Pordrän.

The result is a soft, springy floor with inclines and dips in various directions. As I understand it, this is a technically reasonable solution, but I don't like it anyway.

What I want to do today is to build up again to get a firmer floor, this time with steel joists and lay floor gypsum with tiles on it. A colleague, on the other hand, thinks I should raise the slab, possibly use self-leveling compound and install underfloor heating (currently, there is a water radiator in the room).

What should I do??? Are there any obvious advantages or disadvantages with the options?
I appreciate any input.

Best regards,
Mikael
 
What strikes me immediately is? What type of Styrofoam have they used and how have they placed it. Sufficiently hard Styrofoam should become completely flat and stable.
 
I honestly don't know. The room is next in line, and I thought I'd be a bit proactive - check the situation before I start digging too much. I will find out about kvalisort as soon as possible. I have a feeling that it might be the substructure that isn't properly executed...

In the meantime, I'm still happy to receive your expertise; maybe I should add another option: Leave it as it is, cast a slab, or frame it up? Why should I choose what?
 
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