ᐅ Air gap above interior masonry

Hello,

We have just noticed that there is an air gap of about 10cm (4 inches) between the interior masonry and the roof battens on the upper floor.

I have read online that some people fill this gap with insulation wool themselves to improve soundproofing.

Has anyone here done this? Does it work, is it effective? If so, does it need to be protected with a membrane (since it is located below the vapor barrier/retarder)?

You mean between the rafters and the masonry, right? Because the battens need to be installed on top of that; otherwise, you can’t properly build a ceiling.

We have that as well, but soundproofing will hardly improve – the door is the first weak point anyway 😉

We also sealed the vapor barrier room by room – which naturally offers some degree of soundproofing.

Unfortunately, we don’t live there yet, so we can’t provide any practical feedback.

Yes, exactly.
Between the wall and the counter battens 🙂

But the gap leads directly into the next room, with only 2 drywall panels and a short distance in between.

Above the doors, there are 2 doors plus a longer distance.

You can stuff something in there – you don’t need to tape anything further since there’s no condensation in that area.

However, I still doubt you’ll notice any difference.

In any case, we planned it so that no bedroom is adjacent to another, so the issue is likely minor for us – if it exists at all.

So, the drywall installers already stuffed something in when covering with the gypsum boards, so I would have just done unnecessary work 😀

At least on the straight walls; they didn’t put anything in the sloped areas.