Filling holes in the intermediate floor?

[dirrekok]

We recently removed the drain that went to the upper floor of our house, which was built in 1927.
Now we have a large hole in the floor through which you can see straight down to the floor below.
What is the best method to fill this? Just fill it with wood and then finish with wooden flooring, or are there any good suggestions?

Attached is a picture of where the drain came up.

 

[dirrekok]

No one has any suggestions.
My last thought is to build some kind of wooden box that I fill with insulation material, like Hunton wood insulation. And then floorboards on top of that.

 

[jonaserik]

There is probably a hole in the ceiling underneath as well, you can lay down some wooden boards in the hole that lie on the wood there and screw them from the underside with countersunk screws, then there is something to attach a board or something else to cover the hole. In the hole, you put a plastic bag and press down regular insulation until full. What you should use for surface material I don't know, but it will probably be some kind of board, floor chipboard that is tongue-and-groove glued at the joints is a must if it's going to be a carpet. Otherwise, a 16 or 22 mm chipboard that just covers the entire floor plus the hole and maybe a click floor on top of that, holds well and becomes rigid. No special needs to plug the hole.