Hey, I need help with a question. My partner's brother is planning to add insulation to his upper floor, which currently has 10 cm of insulation. It's glass wool from the 70s. I've told him to tear everything down as he's going to add ventilation that doesn't exist now. Now, to the dilemma: I think he should add at least 20 cm of insulation, making a total of 30 cm, but he thinks a maximum of 25 cm because he feels it takes up too much space, which is about 70 sqm now. What do you guys in the forum think? Question two, I say he should replace all the insulation with new ones, but he thinks he should reuse it to save a few thousand. If he reuses it, the old insulation won't fit as he's going to make the compartments smaller, so to speak. What do you think?
