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Old 10-17-2013, 04:18 PM   #1
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floor joist insulation

Hi folks,

I was wondering what kind of insulation you'd recommend - if any at all - for the floor joists that are exposed in my basement.

in the winter, it gets pretty cold out here in PA and I'd like to do my best to keep the cold in the basement and the warmth up in the living spaces.

Here's some photos of my floor joists in my basement:


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Old 10-17-2013, 10:20 PM   #2
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No need to insulated between conditioned floors.

Start researching on air sealing and insulation. That is where you are going to save money.


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Old 10-23-2013, 11:32 PM   #3
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Right now the heat from the room above helps warm the basement, insulating there may cause your water lines to freeze. This depends on the amount of heat in the basement from the boiler ? and other HVAC equipment. I'd air seal all wiring/plumbing holes with fire-rated foam in the floor above, caulk the windows, etc.; http://www.google.com/url?sa=t&sourc...wWATQw&cad=rja

This will help stop the stack effect to the attic; http://www.wag-aic.org/1999/WAG_99_baker.pdf

Canned foam/Thermax the rims; http://www.buildingscience.com/docum...l_seal_rev.pdf

If looking for a warmer floor- full speed ahead;http://www.buildingscience.com/docum...n-crawlspaces/

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17,000 dryer fires a year, when did you last clean the inside of the dryer near motor or the exhaust ducting?

Last edited by Gary in WA; 10-23-2013 at 11:34 PM.
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Old 10-23-2013, 11:42 PM   #4
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None, unless you plan on finishing it for a home theater down there, or home office, and want to keep the upstairs noise down, from disturbing the person down there.

If you are having an issue with a cold house, then you need to direct your attention to sealing around Windows, Doors, electrical outlets, air sealing up into the attic space, insulating the attic, insulating around the perimeter of the basement Joist bays on all four sides.

You also need to introduce conditioned air into the basement, to help keep the upstairs also warm. That means a/c during the Summer if you have Central Air, and heat during the Winter, even if it only brings it up to say 59, it is better then going down there and finding burst pipes, because it got below 45.

Last edited by gregzoll; 10-23-2013 at 11:44 PM.
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