The house itself is a log house with a crawl space. The extension is newer, but I don't know when it was made and don't have any drawings on how the reinforcement and such were done. The upper part of the extension is currently a glass-enclosed patio. Under the patio, there is a basement that can only be accessed from outside.
The basement is not heated, and there is some moisture present. There is a small amount of standing water on a part of the floor, but it's not much. It smells a bit musty, though perhaps ventilation could help with that. The drainage around the house will be redone in the future. The concrete slab in the extension is about 20 cm thick. The basement walls are made of masonry blocks. Inside the basement, there are narrower masonry walls which I assume are load-bearing.
Currently, the idea is to extend the house by utilizing the patio surface of the concrete slab.
Are there any moisture risks if you choose to lay insulation on top of the slab and then convert this into living space?
If there are other good thoughts and ideas regarding material choices or approaches, I would be happy to receive them.
Here's a simple drawing to show roughly what it looks like.
I would say no to moisture.
But according to the drawings, you need to lower the garage slab.
The slab over the basement level is somewhat higher than the floor in the house. There will be a small level difference there.
What I am pondering is that they will make the deck slab heated, but since there is no direct contact with ground moisture, moisture is unlikely to become problematic?
