Insulating wooden beams of the attic ceiling

If heating is done upstairs, why insulate? If insulation is installed, there is probably no moisture problem, since there is no dew point in the construction as long as it is warm in the attic. Question: How should the roof surface be insulated? Ultimately, this is where the problem shifts to. What do the sloping roofs on the upper floor look like?

Hello,

so I’ll start in detail then, I should have described it better from the beginning...

The ground floor is occupied by the parents. I am moving into the upper floor and attic.

The ceiling between the ground and upper floor is the one I described with Heraklith boards.

The ceiling between the upper floor and attic is currently only a wooden beam ceiling with 16cm high beams and OSB 4 panels from Egger with 22mm on top.

The attic got a new roof structure with exposed beams and will remain completely open to the top, no intermediate ceiling as an attic floor is planned. The roof has received a [Aufsparrendämmung] with 28cm Steico Therm dry.

Have I forgotten any details?

Best regards

So it is actually specifically about the intermediate ceiling between the ground floor and the upper floor. As mentioned, soundproofing is more important than insulation, since both floors are inhabited and heated anyway.

Okay, then no vapor barrier is needed because there is actually no dew point. Full focus on sound insulation. Acting without careful consideration here can indeed be worthwhile

So actually, it's about both ceilings, although the lower one would be more important and possibly also more difficult to manage.

What do you use for soundproofing then? I'm totally inexperienced with that... I've only read that mass provides soundproofing. So use different insulation? Possibly also the wood fiberboards from Steico in 160mm thickness? Or a completely different ceiling construction?

First of all, thank you very much for the help so far.

Soundproofing is not that easy, especially when it involves wooden beams and not concrete. It depends on the current condition and how much time and money one is willing to invest. Basically, you're right, mass matters. A construction should have a hard material, a soft heavy material, and then a hard material again. I personally know, for example, that soundproofing with the material from the mats that you can place under the washing machine can help a lot. But of course, the question is whether the weight can even be added to the ceiling and whether it makes sense here. That is a question I cannot answer. Then it also depends on how the walls finish at the floor or the ceiling; that can also become a not-to-be-underestimated sound bridge. In another forum that primarily deals with [Fachwerk] (just google it), there are some members who have experience and knowledge, probably a bit more than here. One could read up or inquire there, alternatively it might also be sensible to consult an expert. Simply placing mineral wool or wood fiber between the beams, then OSB on top, and finally the floor would certainly not be ideal. As I already wrote, one should not take the whole thing too lightly and should put some thought into it beforehand, then something usable will come out of it.