Vapor Barrier Or Not? - Insulation - DIY Chatroom Home Improvement Forum


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Old 12-02-2011, 01:26 PM   #1
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Vapor barrier or not?


1940ís cottage with what I believe was called vanity siding. Many years ago I shingled over the siding with felt paper and cedar shingles. The previous owners had blown in insulation, believe it was done in the 80ís. Pretty sure the insulation has settled a lot. The interior walls are 1940ís pine beadboard. Iím going to pull the old boards and pull out the old insulation. Put in new insulation and drywall. The question is do I need a vapor barrier?

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Old 12-02-2011, 01:58 PM   #2
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Vapor barrier or not?


If it was built in 1940 I'd also plan on redoing and adding onto the electrical wiring.
No you do not need a vaper barrerer if you use faced fiberglass. I would take the extra time to seal all the holes with foam where wires were run and any plumbing.

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Old 12-02-2011, 02:13 PM   #3
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Vapor barrier or not?


The paper backed fiberglass and don't use the new insulation that's incased in plastic?
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Old 12-02-2011, 04:34 PM   #4
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Vapor barrier or not?


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Originally Posted by pmarsh View Post
The paper backed fiberglass and don't use the new insulation that's incased in plastic?
Yes, you want faced or kraft paper fiberglass insulation, that will provide you your vapor barrier. This will clearly be marked on any fiberglass batt insulation you purchase at your local home center. Regardless of what it's encased in you just want it to say faced or kraft paper. Rule of thumb is the paper is installed toward the warm part of the house. For example if you were installing in an exterior wall of the home the paper would be facing you.
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Old 12-03-2011, 10:46 AM   #5
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Vapor barrier or not?


Where is the home?

Location, exterior cladding, and interior wall construction has everything to do with the necessity of a vapor retarder.
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