ᐅ Cement-Bound Insulation Aggregate – Moisture Issues?

Good evening,

due to varying heights of pipes and conduits on the floor slab, the screed installer advised us to use a cement-bound insulation screed instead of insulation boards. This needs to remain inaccessible for at least 7 days to allow the material to cure. So far, so good.

My question now is the following: If I can’t enter the house for 7 days to ventilate, this causes me quite some concern about moisture, especially in winter.

Does anyone have such an insulation screed in their house, has gone through this process, and can offer some advice?

Thank you!

That is still before the screed. There isn't that much moisture in it yet. However, there are many other types of bonded loose fill that do not need to dry. If you plan to fill the entire area anyway, you can also use perlite.

But whatever you choose, it needs to be coordinated with the energy concept. So, what does the floor structure look like in the plan? Basement? Perimeter insulation also under the slab?

It is a KfW55ee house. We will confirm this again with the energy consultant.
Our screed installer told us that due to the cement used, there is naturally a significant amount of moisture. This is apparently what he usually works with.
We do not have a basement.

Concrete slab:
- Geotextile, gravel bedding, and blinding layer
- 12 cm (5 inches) insulation and 22 cm (9 inches) concrete slab

Inside, a 20 cm (8 inches) floor construction will be installed:
- Damp-proof membrane against rising moisture
- 10 cm (4 inches) insulation
- Underfloor heating
- 4-5 cm (1.5-2 inches) screed (anhydrite is being considered)
- 1.5 cm (0.6 inches) tiles