He specifically stated he had a cavity. If you don’t you can do external cladding insulation and internal insulation.
Comment on €45,000 for a heat pump installation in Germany -- really?
venoft@lemmy.world 5 months agoIf you have a cavity, which a house from the 1920s probably doesn’t have.
Squizzy@lemmy.world 5 months ago
Hyperreality@kbin.social 5 months ago
They sometimes do, but some of these older brick houses use lime mortar which is far more breathable. Allows moisture in and out.
If you use the wrong foam, it absorbs that moisture. Bad. Think mouldy sponge. If you use the right foam, but don't ensure ventilation and tackle moisture issues? Still bad.
The person you're responding to mentions people doing it themselves with an expanding foam gun, which as someone who worked in the industry gives me the shivers tbh. I mean, maybe they'll get lucky, but I wouldn't buy that house. If they used the wrong foam or did it wrong, it's not as if you're going to be able to remove it or start over. It's there forever now.