Hello
Looking at a house from 1984 with an uninsulated concrete slab and floating floor as I understand it
i.e., the following layers: drainage, slab, sand, plastic sheeting, foam board, lumpap, then floor such as laminate/parquet.
Exterior walls and load-bearing walls are made of lightweight concrete in the first floor level, then wooden studs for the second floor level. Non-load-bearing walls are wooden studs on the ground floor. This means most of the wooden beams/sills start at the second floor level—shouldn't this reduce the risk of moisture in the sills since I find it hard to see how lightweight concrete blocks could absorb water?
I know that slab-on-ground construction from the 70s and 80s is often considered a risky construction, but in this case, it seems the wood in the sills has never had direct contact with concrete. The greatest risk I see here is potential moisture that is trapped under the foam and concrete, but that should be replaceable with a ventilated interior floor without major cost, as well as possibly the studded interior wall then.
Looking at a house from 1984 with an uninsulated concrete slab and floating floor as I understand it
i.e., the following layers: drainage, slab, sand, plastic sheeting, foam board, lumpap, then floor such as laminate/parquet.
Exterior walls and load-bearing walls are made of lightweight concrete in the first floor level, then wooden studs for the second floor level. Non-load-bearing walls are wooden studs on the ground floor. This means most of the wooden beams/sills start at the second floor level—shouldn't this reduce the risk of moisture in the sills since I find it hard to see how lightweight concrete blocks could absorb water?
I know that slab-on-ground construction from the 70s and 80s is often considered a risky construction, but in this case, it seems the wood in the sills has never had direct contact with concrete. The greatest risk I see here is potential moisture that is trapped under the foam and concrete, but that should be replaceable with a ventilated interior floor without major cost, as well as possibly the studded interior wall then.
I think there have been different opinions over the years about whether the plastic foil should be placed under the insulation (the foam) or over it, closest to the surface layer.
Are you sure there is sand? I thought they stopped using that in the 70s.
The construction you describe sounds like the first floor is a basement or split level. How far above the ground do the first wooden details come? If it is a floor over a "real" full-height floor, I don't think you need to worry about water being absorbed that high.
Are you sure there is sand? I thought they stopped using that in the 70s.
The construction you describe sounds like the first floor is a basement or split level. How far above the ground do the first wooden details come? If it is a floor over a "real" full-height floor, I don't think you need to worry about water being absorbed that high.
Yes, it should have stated so in some drawing that it was sand, obviously, there should be floor chipboard above the rigid foam as well 
..
Yes, it's a hillside house but a very small part below ground, there's 1 wall that's about 1-1.5 meters below ground, the remaining 3 are free. So on the worst wall, it's about 1-1.5 meters up to the sill. That wall is supposed to be, if I understand correctly (lightweight aggregate blocks, mineral wool, plastic, gypsum) so nothing organic there.
..Yes, it's a hillside house but a very small part below ground, there's 1 wall that's about 1-1.5 meters below ground, the remaining 3 are free. So on the worst wall, it's about 1-1.5 meters up to the sill. That wall is supposed to be, if I understand correctly (lightweight aggregate blocks, mineral wool, plastic, gypsum) so nothing organic there.