Cut away plasterboard in exterior wall

[Lizzy78]

Hello!
I'm renovating my kitchen.
The tiles that were on were so thick and stuck so well that the plasterboard came off when I tried to remove the tiles. SO I decided to saw off the part where the tiles were.
But now I'm a bit unsure here, on the exterior wall there was plastic against the plasterboard. How do I proceed when I plan to put plasterboard back in the hole now? Even if I put plastic behind the board, there will still be air gaps in the joints, right?

 

[Lizzy78]

I should also add that the plastic was stuck to the plaster, it was impossible to avoid removing the plastic as well.

 

[Jonatan79]

How big of a piece is missing then? Can you take a picture? If the kitchen is against an exterior wall and plastic is missing, you can try to place a small piece of plastic there and seal it if possible, otherwise, it's not the end of the world.

 

[Per i Hamrånge]

Should probably add that the plastic was stuck on the plaster, it was unavoidable to remove the plastic as well..

Splice in new age-resistant plastic. There is special tape for this. It has a vulcanizing effect, i.e., it sticks like heck. It will be sealed.

 

[Lizzy78]

Splice in new age-resistant plastic. There is special tape for this. It has a vulcanizing effect, i.e. it sticks like hell. It becomes airtight.

Aha, but how do I tape from the inside when the plastic is attached to the gypsum?

 

[Lizzy78]

How big is the missing piece? Can you take a picture? If the kitchen is against an outer wall and plastic is missing, you can try to put a small piece of plastic there and seal it if possible, otherwise, it's not the end of the world.

The outer wall is only by the window....will also remove tiles under the window...

 

[Jonatan79]

The question is whether you might need to remove all the plasterboards to make it easier to install the plastic, etc.

 

[Lizzy78]

The question is if you might consider removing all the drywall so it becomes easier to work with the plastic etc.

I won't have the energy for that... I'm alone and doing this, only have some help in the evenings... can't manage to haul home large drywall sheets by myself...

 

[Per i Hamrånge]

I won't be able to handle that...I'm alone doing this, only have a little help in the evenings...can't manage to haul large drywall sheets by myself..

In your picture, it looks like you've already torn out quite a bit of drywall. I assume you'll need to replace it with new drywall anyway. You can't reuse the old pieces. Maybe it's just as well to haul home a bunch of sheets and do it properly. Tear it all out. New plastic that tapes to the old plastic. New drywall sheets, plaster and sand. It will look nice and be good. Something to consider: OSB boards behind the drywall, making it much easier to hang cabinets and other items. It does add 13mm, but if there's room, it's preferable (in my opinion).

 

[Lizzy78]

In your picture, it looks like you've already removed quite a bit of drywall. I assume you'll need to replace it with new drywall anyway. You can't use the old pieces. Maybe it's just as well to bring home a bunch of sheets and do it properly despite everything. Tear everything down. New plastic that is taped to old plastic. New drywall sheets, plaster, and sand. It will look nice and be good. To consider: OSB sheets behind the drywall, which makes hanging cabinets and other things much easier. It builds 13mm, but if it fits, it's preferable (in my opinion).

No, clearly I need to replace it with new drywall, but I already have small pieces of drywall at home that I was planning to use for that. I'm still considering the tape you mentioned, going to the building supplies store today to ask for further advice and see what I bring home..

 

[Lizzy78]

Thank you for all the answers! It's nice to hear others' thoughts so you have something to bounce off!

 

[Lizzy78]

Update..
After taping and patching with plastic and sealing with plaster, I still couldn't sleep well at night...I simply feel too unsure if I did a good job.
So today I'm calling around to construction companies to hire professionals for this...best to recognize your limitations...