Neat around the window when adding insulation inside..

[ejwbegysv]

Hello...

For various reasons, I'm building in 45mm on the inside of the future children's room (6 months left now).

What I'm wondering about is how to make it look neat around the window.. I'm going to put up 13mm single drywall..

See pictures of where I am stuck in my considerations...





Another question right away, I have a package of 45mm green insulation, does it work fine to use??

 

[Gladh]

Not an answer to your question, but you should add insulation with 45mm, keep in mind that the plastic in the wall should not extend more than 1/3 into the wall. So if your wall already has 100 mm of insulation and plastic, you are right on the borderline of what is acceptable to avoid moisture damage.

If you have less than 100 mm of insulation in your outer wall and plastic in it, then you can have moisture issues in your wall if you add 45 mm.

- M

 

[ejwbegysv]

Not an answer to your question, but if you are adding insulation with 45mm, remember that the plastic in the wall should not extend further than 1/3 into the wall. So if your wall already has 100 mm insulation and plastic, you are just on the threshold for what is okay to avoid moisture damage.

If you have less than 100 mm insulation in your outer wall and plastic in it, then you can have problems with moisture in your wall if you add 45 mm.

- M

What? The original wall consists of standing planks with about 3cm of sawdust in between, in total about 18cm including the panel. Since the house was built in 1940, there is no plastic in the walls. However, I am considering putting plastic between the insulation and the plasterboard...

 

[Mattias Jönsson]

Skip the plastic - old houses need to breathe! As long as the wind doesn’t blow through the walls, it's never wrong to spend a few extra kWh to keep the walls dry.

I’ve just done something similar - 45 mm wooden studs and fiberglass wool + 30 mm air gap on the inside of double brick (tore down the old interior walls) - and I installed 12 mm MDF in the window recesses. Easy to make it look nice, and the outer corners become much more durable than with just plasterboard.

 

[Larsa]

You should have plastic between the insulation and the drywall. Cutterspån and plank can breathe out moisture in the walls, but glass/stone fiber retains moisture, which can cause moisture damage in the wall. There are many threads about this in the forum.

If you are going to have window trim, I would also suggest using MDF for the reveals. There are a couple of threads specifically about this, so use the search function to get good ideas and different options.

 

[ejwbegysv]

Thanks for all the answers..

Talked to "my" carpenter today and he thought I should go with plastic