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So I'm looking to spray the crawl space on my pier and beam house. One foam guy is telling me I should only do closed cell because of moisture and mold. The other guy, who just sprayed my brother in laws doctor office which was new construction, and had 9 inches of open cell sprayed in the crawl space says there is no problem with that.

Being that closed cell is alot more expensive, I was wondering if anyone had some advise on the matter.
 

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Interesting topic. I've read a lot about this subject regarding underslab insulation for slab on grade type homes. The answer in that situation is that either works given the right PSI ratings. In your situation your really just trying to achieve a certain R value, so if you can get there quicker with less closed cell, then you've got to run the numbers.

I haven't heard of mold issues specifically relating to either type of foam unless there is a building envelope issue already present.

ps. Look into moisture permeability ratings of each. It seems like if you can moisture proof with closed cell at the same time you'll be ahead of the game.
 

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Patsfanindallas said:
I've always agreed with that until this insulation contractor, who has a very reputable company in Dallas told me otherwise. That's why I was asking.
Since he is in Dallas then, who's material does he use then? There is two large foam suppliers in Dallas and truth be told, I would only trust one of them. There is a lot of people out there that will say anything to take your money and then there gone. I would go with the closed cell foam in a crawl space for sure. You get better air sealing and R value with less thickness.
 

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I agree with the above posters. Closed cell is definitely a better choice for crawl spaces. Generally we are only using open cell in new construction applications when we have a 2x6 wall system. Open cell offers lowers cost per inch but one has to apply a lot more of it to achieve the what closed cell does. Open cell can retain some moisture which could be a concern in a crawlspace. Check us out at www.montanafoam.com
 
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