Tyvek Paper: Used on Top of Insulation?
LESLIE: John in Washington has a question about Tyvek paper. What can we do for you today?JOHN: Yeah, I was curious. We gutted a house that we’ve been living in because – well, it needed some desperate work. It’s a complete money pit.TOM: (chuckling) OK.JOHN: But we’re putting it back together now and we’re putting insulation in the walls and the studs, you know, they range from like 12 inches apart to 20 inches apart.TOM: OK.JOHN: You know, just because we’re retrofitting this hundred-year-old house.TOM: Right.JOHN: And on your insulation you have your craft paper.TOM: Yes, mm-hmm.JOHN: Well, that’s getting all cut up and everything because we’ve got all of these weird cuts and angles and stuff that it has to fit into.TOM: (overlapping voices) Right. OK. Yeah, so your question is can you restore that or can you put a second moisture barrier?JOHN: Yeah, that’s what I was wondering. I know – we used Tyvek on the outside – you know, underneath the siding – and I was wondering if I could use that on the inside as the moisture barrier.TOM: Yeah, you know, I don’t see why not. Typically, people use just viscuine or sheet plastic for that but I don’t see why you couldn’t use a material like Tyvek on the inside. It’s vapor permeable and it will contribute to that vapor barrier.JOHN: OK. OK.TOM: So, yeah, it’s fine to do that and, you’re right, it’s very hard to get a really good vapor barrier with the paper surfaces that are attached to the insulation because you really have to have like a perfect insulation. And even if you do have that, you end up with a lot of extra cuts and that sort of thing.JOHN: Yeah. So …TOM: So I think that’s an option. And John, if you want more tips on installation of insulation (Leslie chuckles), you can find that at MoneyPit.com. We’ve got a green section on the website with lots of tips on how to insulate your house.JOHN: Wonderful. Alright.TOM: Alright?JOHN: Well, thank you very much.TOM: You’re welcome, John. Thanks so much for calling us at 1-888-MONEY-PIT.