I have an extension on a pier foundation that is placed against an old garage. The extension has an uninsulated concrete slab and is built with blåbetong blocks plastered on the outside.
Now it seems that the insulation from the extension is completely exposed and without an air gap.
The question is what happens if I "just" put wind barrier and some board in the open gap in the pier foundation, as well as wind barrier + air gap + facade on top. Will I have moisture problems then? Today it seems to be fine, I can't see mold or moisture on the wall.
Or should I tear down the wall and create an air gap? If so, is it enough with a hidden air gap, i.e., build tightly against the pier foundation, leave an air gap between the extension and the garage, as well as a regular wooden facade + air gap above the garage?
My wife mainly wants to get it done as quickly as possible and thinks tearing down the wall is bothersome since we have just wallpapered it.
