Sealant when installing windows

[KungAnka]

I am going to install new windows. Standard insulation for isolation purposes (usually use lindrev) but I want to complement with something airtight to minimize noise and drafts. Some kind of sticky mass, but what? The only place I shop at is Byggmax, so preferably something from their range.

 

[Åsa Lund]

Polyurethane sealant is usually used outdoors, right?
Indoors, you cover the joint with molding.

 

[KungAnka]

Externally, it will be plaster since the house is plastered, internally trim, but it doesn't seal. In several descriptions I've read, it states that you pack with a type of fiberglass, possibly diffusion-tight sealant on the outside and on the inside a backing rod and tight sealant. But what type should it be?

Example of description: https://spfonster.se/inspiration/sa-gar-det-till-att-dreva-fonster/

 

[Derbyboy]

Where do you read that it should be diffusion-tight on the outside?

 

[KungAnka]

Where do you read that it should be diffusion-tight on the outside?

Where do you read that it should be diffusion-tight on the outside?

It's my phone that auto-corrects diffusion-open to tight. If you read the link I included, you'll see that it should be open out and tight in. (Just like most things in the house).

Thanks for the answers so far, but both are about joints for the outside, I am looking for suitable joint for the INSIDE of the insulation. The inside, that is.

 

[Derbyboy]

On the inside, I have used Essve 25

 

[Derbyboy]

https://www.proffsmagasinet.se/mask...DyGMzMRiXseRDk_sSLRmhkggWJn-CkPBoCVYUQAvD_BwE

 

[Matti_75]

Use swelling joint tape instead

 

[KungAnka]

Use expanding joint tape instead

Thank you, I've used that on a door before in a newer house, but the window openings in this house (1922, vertical plank) are so uneven that I don't think it will work. It can be 20 mm at the top, 1 mm in the middle, and 10 mm at the bottom.

 

[Åsa Lund]

With such uneven joint width, it's doubtful if it will look good with soft joints. Better to use metal then?

 

[KungAnka]

With such uneven spacings, it's doubtful if it would look good with soft sealant. Better to use metal instead?

Should I have metal on the inside of the house? I don't think that would look nice.
I am supposed to seal between the frame and the wall on the inside, the sealing is to make the insulation air and soundproof, the windows are facing a road. On the outside, the insulation will be covered by plaster and on the inside by a wooden trim.

 

[Derbyboy]

Diffusion-tight tape?

 

[tergo]

latexfog

 

[Derbyboy]

Is it necessary to have anything else besides sheathing if the house is not wrapped in plastic?

I mean in older houses with something like roofing felt in the walls

 

[Åsa Lund]

No, you should not have sheet metal on the inside.