Home>Discussions>INSULATION & HVAC>What to use for vapor barrier?
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Lots-o-work
Re: What to use for vapor barrier?

I was able to find some Tyvec tape and 4 mil sheeting at Home Depot but they did not have any acoustic caulk. So, I will use what I have and call it good.

Andy4969
Re: What to use for vapor barrier?

The purpose of a vapor barrier is to stop moist air from the inside of a heated space to migrate through a wall and condensing on the cold exterior wall surface. Having a vapor barrier on the exterior wall surface does absolutely nothing to prevent this from happening. Vapor barriers are meant to be installed on the interior" heated" side of the wall. This is why when installing faced insulation, the paper is applied towards the living space. Plywood, house wraps are not vapor barriers. Just because code says they are doesn't mean they are correct. I can't count the number of times I had to correct a code officer because they thought they new. The most effective vapor barrier you can use is plastic sheeting applied to the studs prior to installing the interior wall surface. The use of closed cell spray foam would have been a better choice as it will act as your vapor barrier as apposed to open cell which will absorb water.

Andy4969
Re: What to use for vapor barrier?

And of course after I hit the reply icon I noticed how old the thread was. Oh well.

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