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Old 08-22-2016, 02:23 PM   #1
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Crawl space insulation Q's


Have a couple questions regarding insulating vented crawl space.
Location - Pacific NW. A bit of rain gets in during the winter but not a major issue as it dries out quickly. Home is 40 years old and has no issues with mold, etc. Dirt floor will be sealed with new vapor barrier. Given this . . .

1) Any value to installing kraft-faced insulation instead of un-faced given a solid vapor barrier will be going in?
2) Recommended R-value for this area is R30, yet kraft faced insulation sold locally is typically R-19. Is that somehow sufficient?
3) Any other thoughts, questions or considerations before we purchase product?

Thank you!
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Old 08-23-2016, 09:38 AM   #2
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Re: Crawl space insulation Q's


Here is a good read here.

Gary is out of the area and knows the climate very well. He supplies some links in this thread here.

http://www.diychatroom.com/f103/craw...lation-300849/
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Old 08-23-2016, 04:41 PM   #3
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Re: Crawl space insulation Q's


Thank you. A lot of helpful info was in that thread. I'm pretty much set, but 1 more question . . .
- The floor joists are 6" in depth. R30 is recommended in our climate but is typically 9+" thick. Can get R24 which is about 6" thick so correct to simply put in the R24?
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Old 08-23-2016, 04:55 PM   #4
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Re: Crawl space insulation Q's


I would incorporate some rigid foam over the joists to assist with the thermal de-coupling of them from the outdoor space. That will help them stay nice and dry as well as make them warmer on the floor.

Not sure it if has application in your case given the specifics of that climate, but many times folks will leave a small air gap in the joist cavity to the underside of the subfloor to help keep it warm as well as long as the sections are well sealed via spray or rigid foam.
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Old 08-23-2016, 06:47 PM   #5
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Re: Crawl space insulation Q's


Ok. Good thought. Thanks so much!
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