Which side for the vapor barrier

[Jasse64]

I need help with a question. I'm renovating a room and have added an additional insulation/installation layer of 45mm. Inside this is the original vapor barrier/plastic, followed by the main insulation, from inside out. I have also installed a larger door section that required a beam replacement using a substantial glulam beam that is 90mm thick. The original insulation consists of a 90mm board, so I will not have any insulation outside this, other than asfaboard and a facade board of 20mm between the brick facade and the air gap.
So the question is, should I have the vapor barrier directly against the beam, then 45mm insulation-plywood-drywall so it matches the rest? Alternative 2 is to place the plastic after the additional insulation, then plywood-drywall? Anyone with expertise?

 

[Takläggare]

Need help with a question. I am refurbishing a room and have added an extra insulation/installation layer of 45mm. Inside this is the regular vapor barrier/plastic, then the main insulation, seen from the inside out. I've also installed a larger door section which required a reinforcement in the form of a hefty laminated beam that is 90mm thick. The regular insulation consists of a 90mm board, so I will not have any insulation outside of this other than asfaboard and a facade board of 20mm which is between the brick facade and the air gap.
The question is, should I have the vapor barrier directly against the beam, then 45mm insulation-plywood-drywall so it matches the rest? Option 2 is to place the plastic after the additional insulation, then plywood-drywall? Anyone with knowledge?

Go with the first option, because when you build with an installation layer, you can run some pipes without damaging the vapor barrier, and you don't drill a bunch of drywall screws through it, keeping it as sealed as possible.

 

[Jasse64]

Take the first option, that's why you now build with an installation layer, so you can run some pipes without destroying the vapor barrier, and you don't drill a lot of drywall screws through it, keeping it as tight as possible.

Thanks, yes that's how it is now but still open. Wanted to get some thoughts on this before I finish as it is easily changed.

 

[Takläggare]

Thanks, yes, that's how it is positioned now but still open. Wanted to get some thoughts on this before I finish as it's easy to change.[image]

Looks good, even the laminated beam has good insulation value, maybe just get the plastic in 90 degrees against the upper 2"2" so you have room for 45 mm insulation.

 

[bossespecial]

I would recommend having a thin layer of insulation between the beam and the vapor barrier just to ensure that the plastic does not rest on a cold surface.

 

[Jasse64]

Looks good, even the glue-laminated beam has a good insulation value, maybe just get the plastic in 90 degrees against the upper 2"2" so you have room for the 45 mm insulation.

The upper 2" stud is not yet mounted, it's the top plate you see in the picture. However, it will be in place shortly.

 

[Jasse64]

I would recommend having a thin layer of insulation between the beam and vapour barrier just to ensure that the plastic does not rest against a cold surface.

Hi, thanks for the reply. Could you elaborate a little on a thin layer?