Foam Insulation to Seal a Crawlspace
LESLIE: Eddie in Mississippi is on the line with an insulation question. What can we do for you today?
EDDIE: I’m just wondering if spray-foam insulation will cause any moisture problems or any other problems that I’m going to expect?
TOM: No, absolutely not. In fact, a sealed crawlspace is one very sensible approach that you could do with spray-foam insulation. A product like Icynene would work perfect for an area like that. If you have fiberglass insulation, then you have to ventilate the foundation area in that crawlspace and that’s a different approach. But if you’re using foam insulation, the entire surface becomes totally sealed and you will find that it remains very dry.
EDDIE: OK. I have another question. How thick would you suggest that I put the spray foam?
LESLIE: I don’t think it’s something you do yourself.
TOM: Yeah. I don’t think it is something …
EDDIE: The contractor said that they normally do like an inch-and-a-half or they could put it however thick I’d like. I just wondered how thick it’s normally applied.
TOM: That’s going to depend on the type of foam insulation that the contractor is working with. Every manufacturer’s insulation is going to have a different R-factor per inch. But what you – the number you really want to focus on is not how many inches it’s thick but what’s required to give you an R19 level of insulation.
EDDIE: OK. Well, thank you very much.
TOM: You’re very welcome. Thanks so much for calling us at 888-MONEY-PIT.