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Old 01-19-2009, 01:05 PM   #16
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Moisture on Inside of Sheathing


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Originally Posted by strublesiding@optonline.n View Post
hmmmm....
Recommended practice with remodelers. Perfectly ok.

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Old 01-19-2009, 02:24 PM   #17
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Moisture on Inside of Sheathing


ok kool
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Old 01-19-2009, 02:28 PM   #18
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Moisture on Inside of Sheathing


The vapor barrier on faced insulation does not provide an adequate vapor barrier. It contains seams that are not sealed. A vapor barrier has no seams or penetrations that are not sealed. A building inspector will not let you get away with faced insulation as a vapor barrier where one is needed. They want to see a seemless barrier.

Josh Jaros www.jarosbros.com
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Old 01-19-2009, 08:16 PM   #19
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Moisture on Inside of Sheathing


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You really need to understand two parts to why there is condensation. Everyone mentioned that moisture is getting to your OSB. What you also need to take into consideration is the fact that the inside of your OSB is below the dew point. You don't have enough insulation in your wall to allow the temp of the framing on the outside to be below your dewpoint. Even if you are prohibiting the migration of moisture from the inside out, you might still have frost due to moisture from the outside. Northern areas of the country add 1 to 2 inches of polystyrene now to deal with this. It keeps the temp on the outside of framing from reaching the dew point thus preventing frost from building up. Most older houses have frost inside the sheathing all the time, people just don't know it. Generally, this moisture just evaporates when it warms up outside but sometimes it can be a problem. If your OSB is warm enough you are going to get condensation. It is a combination of moisture and temp.

Josh Jaros (Jaros Bros. Construction)
I assume you need to be extra careful with the interior vapor barrier if you seal the outside with polystyrene.

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