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Old 12-06-2009, 01:30 PM   #1
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Insulation under house on pilings

House is on short pilings (3ft), open on all sides. How best to insulate under home in MidAtlantic (sub zero) to prevent pipes/drains from freezing?


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Old 12-06-2009, 02:05 PM   #2
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open on all sides.
Ayuh,... Close it in on all 4 sides,+ insulate the banking...


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Old 12-06-2009, 05:41 PM   #3
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Spray foam.
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Old 12-07-2009, 06:47 AM   #4
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You can't leave the pipes and drains on the exterior 'envelope' of your house and hope they won't freeze. The solution is to either bring them to the interior and insulate around them, or leave themn where they are and create a new exterior envelope that encloses them.

Now you can seal in the four sides and insulate the new space created (like a crawlspace) or sprayfoam the underside of the floor creating the thermal break they need.

I'm with jaros on this.
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Old 12-07-2009, 07:02 AM   #5
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You also need to consider water and sewer lines were they enter and exit the house not just between the floor joists.
I think spray foam would be the best choice, but expensive.
Rodents entering the insulation from below is also a big issue with fiberglass, it may also be a problem with spray foam, but I can't say for sure.
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