Subfloor parquet thin concrete slab

[dfgh]

Hello

I'm going to lay new parquet flooring in a 15 sqm room on a concrete slab in a house from the 70s.
The slab is quite thin.
I don't want to complicate things, I have durable construction plastic leftover from insulating the upper floor,
I was thinking of laying that at the bottom on the slab, and then rolling out floor foam that I also have leftover from the upper floor.

Can I do that or should I buy underlayment with built-in moisture protection?

 

[NoOne2k]

If you have the gadgets, go for it!

 

[corre]

You can start by taping a 1m2 plastic sheet onto the slab for 2 days and see if it becomes damp. You will see it as condensation on the plastic.
If it becomes damp, you are trapping moisture with your method and it can move a moisture problem to walls or create odor. In that case, it's better to have a studded membrane (platon) underneath so some ventilation can be created.

 

[dfgh]

You can start by taping 1m2 of plastic on the slab for 2 days and see if it becomes damp. You will see it as condensation on the plastic. If it becomes damp, you are trapping moisture with your method, and it can move the moisture problem to walls or create odor. In that case, it's better to have a dimpled mat (platon) underneath so some ventilation can be created.

I don't think it will condense; in another room awaiting renovation, I have temporarily put construction plastic over everything for half a year and then boards on top, and it is bone dry there. But there have been odor problems in the house earlier. Sill replacement, improved ventilation, etc., have been done. As you describe, does it also trap any potential moisture with, for example, Kährs' own flooring underlay with a built-in moisture barrier?

 

[corre]

If it's their Tuplox you're referring to, it sounds like it blocks out a large portion of the moisture.
If you don't currently have issues with the other room, it seems like you're fine with your initial thought.

https://www.xlbygg.se/umea/sortimen...lagg-kahrs-tuplex-konsument-box-16-5m2-154115