How to manage moisture in concrete slab against air(!)?

Emil Öberg · 2025-01-16T10:11:22+00:00

I have a room I'm going to rebuild after a minor water damage (from water inside). The first meter of the room, marked in red in the picture, is concrete against the outdoors. It's the overhang over the garage (second picture). The rest of the room is above the garage which is heated but maintains a lower temperature. Originally (from -62), there was a thin construction plastic sheet on the concrete at the marked area, and then it was framed and insulated with fiberglass wool. I'm considering how best to deal with the part that extends outdoors. Should I put a diffusion barrier there? An idea I'm toying with is a Platon mat and ventilated skirting boards, XPS and now that I've torn out the floor, I can replace the radiator with underfloor heating laid on the XPS.

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#16

Member · Stockholm

· 2 593 posts

26 Feb 2025 at 8:15 PM

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Member

Stockholm
2,593 posts

26 Feb 2025 at 8:15 PM

That sounds completely reasonable. If it has worked before, it will probably work for a while longer

How to manage moisture in concrete slab against air(!)?

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