I have a concrete slab foundation without a basement, 1974. On the outside under the front door, there is a depression in the concrete for the front steps, where underneath the steps the exterior wall plate is completely visible. We have now ripped up the parquet floor in the hall and removed the embedded joists in the concrete (floor). The plastic sheeting was partially missing, and insulation was lying directly against the concrete. Anticimex reported moisture (condensation) damage in the hall floor very locally inside the front door due to the visible plate and the partial lack of plastic. We discovered after Anticimex was here that the roof is leaking, and that could also be a cause?!
1. Do we really need a mechanically ventilated floor? The rest of the house has the same raised construction from '74, and it's dry. Plastic sheeting is also missing in the adjacent rooms to the hall, and even there, it's dry (Anticimex has measured). I was thinking of using age-resistant plastic, raising the floor with joists (no wood in contact with concrete, maybe steel studs), insulation, laying down floor gypsum/chipboard, and then tiles. Comments?
2. Which cleaning agent should I choose for the concrete slab?
3. Neither the interior nor exterior plate is rot-damaged or soft (no moisture measurement done here), is it sufficient to seal the plate from the outside then?
4. Some said it could be due to shortcomings in the facade, like in the water diverter behind the brick or mexistone. How do you find out about this? We have mexistone.
