Filling holes in the ceiling after removing a wall

[GabrielMT]

Hello!

I have torn down an interior wall in an apartment and now have a hole in the ceiling after the wall was removed. The hole is about 5-6 cm deep and 3.20 meters long. My thought is that it should be possible to fill it in with gypsum plaster and then use putty to get a relatively even surface. However, I am unsure how well such material adheres to the iron/steel beam and the wooden joist in the ceiling. I would appreciate tips and solutions for this problem!

 

[Maestrono]

Screwing up drywall is indeed an option. Then you avoid the mess of plastering the ceiling.

 

[GabrielMT]

Have also thought about it, but where would I then attach the drywall? I guess I'm not allowed to drill into the steel beam since it's load-bearing?

 

[Argastesnickaren]

Glue up styrofoam so you don't have too much to putty

 

[Maestrono]

Looks like there's plaster on reed that is attached to boards on the ceiling. So you have wood behind the plaster. Buy long drywall screws and just drive them through the plaster so they anchor into the wood. Alternatively, first install furring strips and then screw the drywall into the strips.

 

[GabrielMT]

Looks like it's plastered on reeds attached to planks in the ceiling. So you have wood behind the plaster. Buy long drywall screws and just go through the plaster so it attaches to the wood. Alternatively, first put up battens and then screw the drywall into the battens.

Ahh! Good tip! I thought if you want an even surface with the ceiling, you would remove about 5 cm of the plastered ceiling up to the planks in the ceiling, then attach the drywall to the wooden planks and then plaster a few centimeters over the drywall to get an even surface with the rest of the ceiling. Do you think you need to insulate any space between the iron beam and the drywall?

 

[Lechuza]

Ahh! Good tips! I was thinking if you want to have an even surface with the ceiling, you could remove about 5 cm of the plastered ceiling up to the planks in the ceiling, then attach the plasterboard to the wooden planks, and then plaster a few centimeters over the plasterboard so you get an even surface with the rest of the ceiling. Do you think you need to insulate that small gap between the iron beam and the plasterboard?

Foam sealant?

Cut off the excess then putty evenly, about 10 times easier than what you just described.

 

[GabrielMT]

Expanding foam?

cut off the excess, then smooth with filler, about 10 times easier than what you just described

By covering the entire void without drywall? Does it adhere to metal? I want to find a solution that doesn't crack after a year or two.

 

[Peter2400]

By covering the entire gap without drywall? Does it attach to iron? I'd like to find a solution that doesn't crack after a year or two.

Yes, it attaches well.
I can recommend Biltema's gun together with their stone adhesive. It works just like foam sealant but doesn't expand as much and becomes slightly harder.
But make sure to remove anything loose first.
https://www.biltema.se/bygg/kemikalier/fogpistoler/fogskumspistol-2000023750
https://www.biltema.se/bygg/kemikalier/lim/stenlim-2000029972

 

[Lechuza]

By covering the entire gap without drywall? Does it attach to iron? Want to find a solution that doesn't crack after a few years.

Fill with polyurethane foam, let it dry, then cut off the excess. Apply putty to make it even, glue paper strips with wet room glue to cover the hole. After this dries, apply putty 2-3 times thinly, then sand and paint.

The paper strips are used to prevent cracking; if you skip this, it will crack anyway.

You can do as you said with the drywall, but it feels much easier with polyurethane foam.

Regards, the painter