philpom
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# Posted: 12 Jan 2026 05:35pm
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When our cabin originally went up the floor had batting insulation put under the floor and was sealed underneath with vapor barrier that wrapped up and around the girders and was nailed in. Nice and tidy, clean look but now almost 15 years later the vapor barrier has weathered and a combination of wind and critters has started to pull it down and get at the insulation. Some of it has been displaced making for some cold spots on the floor.
I first thought to prevent this again is 1 of 2 things.
new batting insulation where needed and close it off between the girders with 1/4" plywood.
or
Replace the batting where it is missing and close it off between the girders with rigid foam board, think Corning, and possibly sealing it in place with great stuff.
Thoughts? Other ideas? There is some plumbing that comes through the floor with plans to add some additional plumbing so I don't want to make that a royal pain. For the most part there is plenty of working room under the cabin, can stand under much of it but it gets a little tight on one end, down to about 12".
Thanks y'all.
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