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Old 01-20-2009, 11:36 PM   #1
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crawlspace insulation


Hi there, I have a crawlspace that I've planning to insulate and put plastic on the ground. It's on a poured concrete foundation and dirt on the ground. It has a 12 vents around the walls. Ducts(insulated) and water pipes(not insulated)are also in the crawlspace. Last week we had a cold snap. We had few nights of 0 to 8 degrees and below zero wind chill. I was afraid the pipes would freeze but thankfully it didn't. I cheked my crawlspace during those times and it felt very warm, thus prevented the pipes from freezing. So I know I'm losing heat somewhere. Now I'm having second thought. I was planning to install batts betwen the joists and then put plastic on the ground then close the vents until it gets around 40 degrees. My question is, is my water pipes in danger of freezing if we have another cold snap? I'm also insulating the pipes while I'm in there. Is this the correct way to do it? Thanks.

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Old 01-21-2009, 07:16 AM   #2
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crawlspace insulation


There is a foundation vent that is mechanically temp. controlled. Closes at at 40 deg , opens at 70, or something like that. All polycarbonate so not rust corrosion, with bimetal spring to operate damper. That is one thing that would help. Plastic on the dirt is a must to reduce moisture. 2" rigid EPS foam on the walls will insulate that. Some fiberglass at the rim joist between joists also helps. Not sure you want to keep all the warm air from getting into that space, with pipes down there. Keeping the cold from getting in is a better idea.

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Old 01-21-2009, 06:36 PM   #3
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Thanks for the reply. I think the crawlspace is warm because of the heatducts heat loss and the uninsulated ceiling. I'm just afraid I'll have frozen pipes if I insulate between the joist.
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Old 01-21-2009, 09:10 PM   #4
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Crawl space venting is to be discouraged as the vents are the source of excess moisture and cause heat loss! The crawl space should be completely sealed and treated the same as the conditioned space in the rest of the house! This means insulating the walls, not the floors!
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Old 01-22-2009, 08:39 AM   #5
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Originally Posted by Wildie View Post
Crawl space venting is to be discouraged as the vents are the source of excess moisture and cause heat loss! The crawl space should be completely sealed and treated the same as the conditioned space in the rest of the house! This means insulating the walls, not the floors!
I would agree... The walls should be insulated
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Old 01-22-2009, 11:30 PM   #6
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Quote:
Originally Posted by Wildie View Post
Crawl space venting is to be discouraged as the vents are the source of excess moisture and cause heat loss! The crawl space should be completely sealed and treated the same as the conditioned space in the rest of the house! This means insulating the walls, not the floors!
Yes!!!

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