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Old 04-12-2008, 09:05 PM   #1
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Basement vapor barrier question


I'm finishing a basement and have a question about the vapor barrier. The walls in this section are half foundation and half studs/siding with insulation and vapor barrier. I'm building a full wall in front of this. I saw in a previous post the need to remove the old vapor barrier to avoid trapping moisture between the old one and my new one. My question is since there's a gap between my top plate and the original top plate, do I need to do anything with my vapor barrier when i reach my top plate to seal back to the original top plate. My question is mainly about the wall that runs perpendicular to the joists, but there will be a similar question on the adjacent wall that runs parallel to them. I'm in Kansas if that matters from a climate perspective.

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Old 04-12-2008, 10:30 PM   #2
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Basement vapor barrier question


Insulation and vapour barrier need to run all the way into the joist cavity and touch the bottom of the subfloor to meet 'code'.

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Old 04-13-2008, 10:10 AM   #3
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Basement vapor barrier question


Yup, and fill the space between the 2 stud walls with insulation. Rib batts apart and lay them in horizontally for the best coverage.
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