To be or not to be of the vapor barrier

[Joshua Dalton]

Hello!

I have a villa from the 1930s and I am currently renovating a room where I have removed the Treetex boards. Behind the Treetex, there are horizontal planks. I plan to frame up and put gypsum on the walls. On at least one wall, I am considering additional insulation with mineral wool.

My question is whether I need to use a vapor barrier? ChatGPT suggests that I should use it, but I am unsure and would like to hear your experiences and thoughts on how best to do it in an older villa.

Thanks in advance!

 

[BigR]

When I tear down tretex and remove old insulation from a wall, I staple new windproof fabric from the inside of the outer wall, then mineral wool, plywood, triofol vapor barrier, and finally drywall. I have exhaust ventilation, so there is negative pressure in the house. The insulation thickness varies between 10-15 cm, depending on my motivation for how much I want to insulate. Everything is better than the original 7 cm cardboard from the 50s.

I don't think chatGPT can glean anything sensible on this topic. Vapor barriers in moderately insulated houses with constant heating and ventilation are usually justified by some sort of magic.

 

[Jonatan79]

Hello!

I have a villa from the 1930s and I'm currently renovating a room where I have removed the Treetex boards. Behind the Treetex, there are horizontal planks. I plan to install studs and put drywall on the walls. On at least one wall, I intend to add insulation with mineral wool.

My question is whether I need to use a vapor barrier? ChatGPT suggests I should use it, but I'm unsure and would like to hear your experiences and thoughts on how to best handle this in an older villa.

Thank you in advance!

It doesn’t make a difference in a room if the whole house is without a barrier or seal.

 

[Joshua Dalton]

It doesn't make a difference in a room if the whole house is without a barrier or stopper.

Yes, but no other room has drywall. Won't that affect it?
I can add that I have no ventilation, so to speak.

 

[Jonatan79]

Yes, but no other room has plaster. Won't that affect?
I can add that I have no ventilation so to speak.

Absolutely not vapor barrier. It's enough with nothing or vapor retarder. Ventilation is good to have I've heard…