Underbelly insulated with 3 1/2 in. fiberglass roll insulation.

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Rogerrd4
Posts: 1
Joined: Mon Nov 05, 2018 9:43 pm

I hired a guy to reinsulate the Underbelly of my mobile home, he did a great job on it and the floors are a lot warmer now, and the house is warm now without any cold drafts.

He inserted 3 1/2 in. fiberglass roll insulation between the floor joists and stapled the brown paper side to the bottom of the joist and then he stapled 6 mil plastic over the insulation as a vapor barrier and to help hold the insulation up.

After reading on your site that this was a very bad idea to do it this way because it will not have any way to breathe and cause the insulation to get wet, rot the floor out and all sorts of other problems.

Do you have any ideas on how I might fix this problem without having to tear it all back out and redoing it.?

Any help or suggestions would be appreciated.
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Greg
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Joined: Wed Feb 28, 2007 8:01 pm
Location: Weedsport, NY

I think I would pull the plastic, open the paper vapor barrier to allow some air flow and use either original type material or tyvek to allow it to breath.

Greg
"If I can't fix it, I can screw it up so bad no one else can either."
Mark440
Posts: 279
Joined: Tue Feb 26, 2008 8:33 am
Location: Anna, Tx

this crawlspace venting is old school. very old school. old school before there was school...

https://www.thisoldhouse.com/ideas/craw ... t-question
(additional info at the links in the article)
Opportunity has a shelf life.
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