Total renovation - Install vapor barrier or not??

[Raka]

Removed the pieces and put on plastic Now I will sleep well at night.

 

[JohanLun]

Thank you! Finally someone who doesn't believe in gnomes, trolls, "living materials" and houses that are supposed to "breathe"

Witten,
I am admittedly not a building physicist but a technical physicist, and I don't believe in gnomes either, but it would be fun to do a practical test... I'll take a paper bag as underwear, you use plastic and we'll compare experiences after a day. Or should we use them as gloves?

 

[witten]

Was this meant to be relevant to the topic I was discussing?

 

[guggen]

Was this meant to be relevant to the topic I was discussing?

The topic (TS query) we were discussing was whether it is appropriate to install a vapor-tight membrane when the outside is also sealed. The proposed solution in this specific case was a hygroscopic insulation (with a vapor barrier). Then someone started talking about breathing houses and someone else proclaimed the excellence of plastic in all situations, but we'll leave that aside. As an engineer in another field, but with my fair share of physics studies, it would be interesting to hear a physicist's opinion on this.

 

[witten]

Okay, the thread had probably gone off track.

No, never double vapor-tight layers, that's correct. The proposed solution with a vapor barrier sounds wise, the vapor transmission resistance of the outer fabric seems unknown but it likely doesn't correspond to plastic so it should be fine.