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Old 02-07-2009, 08:35 PM   #1
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Does felt paper allow a house to breathe?


Does felt paper allow a house to breathe? I'm concerned about moisture passing through the interior walls and getting trapped in the framing. My main concern is mold growth behind the drywall and backerboard in a bathroom. The felt is attached directly to the wall studs because of the type of siding.

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Old 02-07-2009, 09:17 PM   #2
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Does felt paper allow a house to breathe?


In my opinion, yes. Felt is lapped just like lap siding, but certainly isn't airtight. Felt has been around for probably a century and is still used in some capacity on basically every home built today. However, if you're worried about making the wall really breathe, go with Tyvek instead.

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Old 02-08-2009, 08:42 AM   #3
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Does felt paper allow a house to breathe?


Both will allow it to breath. Tyvek allows it to breathe more. Most experts list #15 asphalt felt as having a permeance of 4 or 5 perms. The permeance of housewraps varies from brand to brand; Tuff Weather Wrap has a permeance of 6 perms, Barricade has a permeance of 9 perms, and Tyvek has a permeance of 58 perms. Of course, the ability of asphalt felt or housewrap to resist liquid water penetration is a whole other issue; one can't assume that low permeance wraps resist liquid water better than high permeance wraps.
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