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Old 10-21-2013, 11:02 AM   #1
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Insulating Crawlspace


We have an older home that has been added onto several times. When the additions were added, they dug out a crawlspace and poured a basement as well. So half of our home has a basement and some of it has a crawlspace.

The crawlspace is sloped, so at the access (middle of house) is about 4 ft high, but as you go further into the crawlspace it narrows to roughly 1 ft. In other words, There isn't much "wall" space to run insulation up.

Our bedroom/bathroom happens to be over this area and I'd like to insulate if possible, but don't know how best to go about it.

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Old 10-22-2013, 12:16 AM   #2
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You could insulate the floor, or close off the vents and insulate walls/air-exchange with house air; http://www.buildingscience.com/docum...ance-and-codes

Local info; http://www.google.com/url?sa=t&rct=j...3ne2MHy9Aw1hjw

To go along with Point #4 above; http://www.buildingscience.com/docum...n-crawlspaces/

Radon around here; https://docs.google.com/viewer?a=v&q...P2rnn9nxm8UjuA

http://www.energy.wsu.edu/documents/...ces%5B1%5D.pdf

Gary

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Old 10-22-2013, 08:34 AM   #3
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There are no vents to the outside. The crawlspace opens up into an older block wall basement. There is a heating/cooler duct that conditions the space and we keep a humidifier running throughout the summer.
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Old 10-23-2013, 12:50 AM   #4
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6mil poly the dirt, insulate the walls or the floor, as per links.

Gary
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Old 10-23-2013, 06:37 AM   #5
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+1

You have a conditioned crawl, whether it was intended to be as such, and needs to be insulated per those conditions.

Gary's links are spot on.
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Old 10-23-2013, 11:33 AM   #6
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+1

You have a conditioned crawl, whether it was intended to be as such, and needs to be insulated per those conditions.

Gary's links are spot on.
Thanks,
Yeah to best describe our crawlspace, picture a normal block wall basement with a door leading into another low ceiling basement and then another opening leading to the dirt floor crawlspace. It is definitely open to the rest of the basement.

The issue with insulating the walls is that there isn't much wall at all to insulate. That, along with access seems to be an issue. I suppose spray foam would be best since it's not like I'm working with a 4ft wall, more like 12"-18".
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Old 10-23-2013, 06:12 PM   #7
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SPF would be easiest and most effective in these type of access situations.
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Old 10-23-2013, 11:16 PM   #8
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Remember to add a thermal or ignition barrier to protect the foam from fire....

Gary
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Old 10-25-2013, 09:50 PM   #9
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I forgot to remind you to SPF the rims, if you decide on that.

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Old 10-25-2013, 10:51 PM   #10
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Insulating Crawlspace


You could still stud, but just put your top plate and bottom plates then measure each stud individually as you go. That's what I did for my whole basement including the crawlspace as the floor was not even. In your case it sounds like you'd always have to even cut the studs in an angle, that sounds like a rather interesting crawlspace.

I plan to get all of mine spray foamed once I have the money.

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