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Old 09-10-2010, 07:16 PM   #1
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Torn interior building paper


This house was built in the 40s. I removed some drywall and found building paper on the inside. I thought its suppose to be on the outside...

Also it had been painted over and patches of it are torn.

What is this for and is it an issue that its torn?
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Old 09-15-2010, 06:02 PM   #2
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Torn interior building paper


It should be on the other side of the sheathing boards as a water resistant barrier. Inside it is acting as a vapor retarder:
http://www.energysavers.gov/your_hom.../mytopic=11810

Gary

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Old 09-15-2010, 06:13 PM   #3
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Torn interior building paper


well, there was also kraft faced insulation w/ paper on the interior side. That means two vapor retarder layers? Isn't that a no no, or does that only apply to vapor barriers?
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Old 09-15-2010, 07:50 PM   #4
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Torn interior building paper


"that only apply to vapor barriers?" ----- correct. The felt will let moisture through with a perm rating of 6 when dry and 60 when wet. http://www.dickseibert.com/martin.pdf



Vapor barriers are actually a Class of vapor retarder: http://www.buildingscience.com/docum...gs?full_view=1


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