Hello,
We are renovating parts of a house built in three stages: 1966, 2001, 2015. The oldest part is the central section with extensions on two sides. The two newer parts seem to follow their respective newer building codes, i.e., they are built with moisture barriers (plastic in the walls).
We are tearing down walls and floors in the kitchen and plan to replace the insulation. The current insulation consists of old fiberglass wool and cuttings in not too thick a layer... Naturally, there's no moisture barrier.
Since we don't want to lose more than necessary space in the kitchen (preferably no more than 45 mm) and can't access and insulate the floor from underneath (tight crawl space), we are looking for tips on extremely efficient insulation instead.
- Does it work, for example, with polystyrene/ground boards as floor insulation? Is it better than, for example, stone wool? Other options?
- Should we install a moisture barrier/vapor barrier? This would mean that 1/4 of the wall area in the older house section would have it (as well as the extensions), or should we go for a diffusion-open solution, as it is now.
Grateful for thoughts and tips!
