Renovating beam layers ceiling/floor - Problems and questions

Hello everyone,

I am new here, but have already owned my own home (old building) for 6 years. So a little about me... I am Sven, 28 years young, and I am looking for help because I don't quite know how to proceed anymore.

I am facing the problem that in my old building the intermediate ceiling is a beam layer. From below, these are covered with drywall panels and a wooden construction. From above, there is about 60mm of glass wool (beams 180mm), above that cardboard and then a layer of boards (see pictures). When you now walk/move normally upstairs, this comes through extremely loud below (hollow body = megaphone principle?). Currently, the entire floor (13m x 6m) is not in use but is supposed to become living space in the near future.

My idea now would be to remove the entire layer of boards, fill the hollow space (no glass wool!) and then build a proper floor with Fermacell screed boards. Above that will be a foil, then impact sound insulation made of pressed wood fibers and above that OSB boards for a clean finish. The floor (real wood) can then be laid there.

Good idea? Other opinions / suggestions?

Regards -Sven-

My idea now would be to remove the entire boarding, fill the cavity (no fiberglass!)

Sensible. You need weight in the compartment. It’s best to have a structural engineer take a look at what the beams can carry, you might possibly need secondary beams for that. You can also gain a bit with the renovation of the suspended ceiling.
There is a PDF from ift Rosenheim on strategies for the renovation of wooden ceilings regarding sound insulation. The possibilities are very well presented in it.

My idea now would be to remove the entire boarding, fill the hollow space (no glass wool!), and then build a proper floor with Fermacell screed panels. On top of that comes a foil, then impact sound insulation made of compressed wood fibers, and above that OSB panels for a clean finish. Then the floor (real wood) can be laid there

Yes; get a professional involved. I am more familiar with the Fermacell panels being further up (i.e. directly under the covering).

I also know less of a foil inside; rather a filler protection.

And leveling fill or wood fibers for insulation belong under the Fermacell as far as I know.

And then there is of course the statics (someone else already mentioned that).

What did you want to pour into the hollow space? Or how load-bearing is the lathing under the beams?

What did you want to pour into the hollow section? Or rather, how load-bearing is the battens under the beams?

Carrying load is actually not their job at all.

No; let's put it differently. The space between the beams is supposed to be filled. Today, there is only a bit of wood wool in there.

Is there even a load-bearing insert that can be loaded with loose bulk material? (Basically between the wooden beams in the lower third)

Or, what is the structure of the ceiling below the beams?

Or rather, what is the structure of the ceiling below the beams?

Have you googled that afterwards (external links are unfortunately not allowed here, but the search term should already lead to the goal)?

From ift Rosenheim there is a pdf on strategies for the renovation of wooden ceilings with regard to sound insulation.