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Old 07-30-2009, 06:49 PM   #1
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To remove or not to remove tar paper, that is the question


I have an exterior wall that is about to become an interior wall, due to my efforts to enclose an entryway area. The top part of this exterior (soon-to-be interior) wall is adjacent to a small attic area. I temporarily removed the siding that covers this attic so that I could add some insulation. There's tar paper behind this section of siding, and I was wondering whether I should leave it or remove it---the tar paper, that is.

If I leave the tar paper (which would be slightly easier) then I'd have attic, insulation, tar paper, T1-11 siding, drywall, new foyer/entryway, in that order. Given this scenario, is the tar paper a) a good thing, b) a bad thing, or c) something that only an anal-retentive DIYer would worry about?

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Old 07-30-2009, 07:47 PM   #2
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To remove or not to remove tar paper, that is the question


Doesn't this connect the two attics so you would remove it for access? Be safe, G

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Old 07-30-2009, 08:27 PM   #3
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To remove or not to remove tar paper, that is the question


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Originally Posted by GBAR in WA View Post
Doesn't this connect the two attics so you would remove it for access? Be safe, G
No, there is no attic in the new space. The attic is adjacent to the top part of the wall of the new foyer. I'm just wondering whether the tar paper might not trap moisture since it'll be situated between the insulation (in the attic) and a finished (interior) wall.
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Old 07-31-2009, 01:59 PM   #4
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To remove or not to remove tar paper, that is the question


Will the tarpaper be on the warm in winter side of the insualtion or on the cold side? If on the cold side of the insulation, remove it. If on the warm side, it won't hurt to leave it, as the heat from the structure will keep it above dew point and prevent any condensation.
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Old 02-27-2011, 08:34 PM   #5
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To remove or not to remove tar paper, that is the question


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Originally Posted by Maintenance 6 View Post
Will the tarpaper be on the warm in winter side of the insualtion or on the cold side? If on the cold side of the insulation, remove it. If on the warm side, it won't hurt to leave it, as the heat from the structure will keep it above dew point and prevent any condensation.
Agreed, you could also use a utility knife and cut a bunch of slits in it. This would allow water vapor to pass through. If it was mine and it was on an interior wall, I would remove it.
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