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Old 10-09-2009, 06:18 AM   #16
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Cold air return questions


What is the best way to insulate the ducts in the crawlspace? The walls are insulated and there is one supply heating the crawlspace, but it is still always pretty cold down there.

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Old 10-09-2009, 08:46 AM   #17
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Cold air return questions


Are you on a well? Where do your Hot and Cold water lines run for the house? Do any or all of them run through the crawl? If you are in this scenario then I would definitely NOT recommend insulating your heating ducts in the crawl space. You already have a 'plus' in that you have one register adding heat to a critical area of the house, most homes on a crawl do not. They usually rely on just the radiation from the metal ducts to provide enough heat to keep these lines from freezing. If your floors are cold in your living spaces try to mark out the floor areas from underneath in the crawl that are tile or wood above. Then get batts of 8 inch insulation and insulate those areas ONLY. Carpeting doesn't feel cold to your feet and will still let some heat through to help keep the crawl partially heated. Also put up 4 inch foam insulating panels on the walls around the entire perimeter of your crawl, from floor to ceiling. This includes the rim joist pockets where the floor joists meet the rim joist. If your crawl has air vents to the outside for moisture control or make-up air for a furnace put in duct work from the outside opening down the wall to about six inches off the crawl floor. The crawl will stay much warmer, the problem is addressed and you don't have to insulate a necessary heating component.
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Old 10-09-2009, 09:51 AM   #18
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Cold air return questions


Yes I am on a well.
I have a hot and cold running through the crawlspace, that are insulated with the foam pipe insulation.
The crawlspace is unvented, and I don't appear to have any moisture problems.
There are two pieces of 1" rigid foam panels along the perimeter walls up to the sill plate and then pieces of fiberglass insulation up against the rim joist. The panels do not seem to have been put in very meticulously, and there may be gaps in several places.
I thought that since the walls were insulated, and there is one heat supply to the crawlspace, that insulating the ducts and eliminating the radiant heat loss from them, would be ok?
I think the perimeter walls could use some work. Would it help to put fiberglass insulation, or more rigid foam up against the existing rigid foam, and make sure all gaps are sealed?
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Old 10-09-2009, 11:56 AM   #19
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Cold air return questions


It would increase the R value of your wall insulation.

And help to keep your crawlspace warmer.

If you insulate teh ducts. The crawlspace will get colder. Are your floor joist insulated. If not, the floors will also get colder.
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Old 10-09-2009, 01:44 PM   #20
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Cold air return questions


Beenthere is right basicly, except I would still caution against insulating the ducts and any areas that are not carpet covered above.

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