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Old 09-15-2013, 06:14 PM   #1
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basement vapor barrier


I get different opinions on this so I figured I would ask here. I was told do not use a vapor barrier in the basement between wall studs and drywall but if the basement is finished and conditioned then don't you want to keep the warm moist air from getting into the wall cavity and condensing?

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Old 09-16-2013, 06:02 AM   #2
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basement vapor barrier


Where is the home to start with.

Vapor barriers in basement finishes are very overused as an observation but without knowing where you are, tough to say.

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Old 09-16-2013, 08:34 AM   #3
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Where is the home to start with.

Vapor barriers in basement finishes are very overused as an observation but without knowing where you are, tough to say.
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Old 09-16-2013, 09:16 AM   #4
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basement vapor barrier


How are you insulating the basement or is the studding already there?

Rigid foam that is properly adhered and sealed at the foundation wall is about the best application you can do.

That being the case, additional vapor retarder layers are not recommended at the drywall surface.
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Old 09-16-2013, 11:23 AM   #5
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How are you insulating the basement or is the studding already there?

Rigid foam that is properly adhered and sealed at the foundation wall is about the best application you can do.

That being the case, additional vapor retarder layers are not recommended at the drywall surface.
Rigid foam against the foundation wall with stud wall and fiberglass in between. Why would I not add a poly sheeting between fiberglass and drywall?
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Old 09-16-2013, 12:45 PM   #6
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basement vapor barrier


That used to be correct thinking about 12 yrs ago; since then we have come to understand that vapour barriers collect water around moisture-sensitive materials - causing mould.

Nowadays we have a better understanding of vapour barriers and tend to no longer use the poly sheets in favour of air-sealing, and using latex paint as a semi-permeable vapour retarder over gypsum drywall. So thus, we let the moisture come in a bit - but then we ventilate. See this:-

http://apps1.eere.energy.gov/buildin...ems_011713.pdf
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Old 09-16-2013, 12:53 PM   #7
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That used to be correct thinking about 12 yrs ago; since then we have come to understand that vapour barriers collect water around moisture-sensitive materials - causing mould.

Nowadays we have a better understanding of vapour barriers and tend to no longer use the poly sheets in favour of air-sealing, and using latex paint as a semi-permeable vapour retarder over gypsum drywall. So thus, we let the moisture come in a bit - but then we ventilate. See this:-

http://apps1.eere.energy.gov/buildin...ems_011713.pdf
Does this apply to basements or entire house?
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Old 09-16-2013, 01:02 PM   #8
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basement vapor barrier


Would you suggest using a water proofer like drylok on the foundation walls first?
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Old 09-16-2013, 06:59 PM   #9
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basement vapor barrier


No.

Drylok doesn't stop anything.

The foam and plastic sheeting will make a vapor sandwich.
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Old 09-16-2013, 08:26 PM   #10
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No.

Drylok doesn't stop anything.

The foam and plastic sheeting will make a vapor sandwich.
So do you suggest nothing between the studs and drywall then? What about a vapor barrier paint?
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Old 09-16-2013, 09:26 PM   #11
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basement vapor barrier


If your exterior envelope is well sealed, standard batt insulation (unfaced) should work.
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Old 09-16-2013, 09:37 PM   #12
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basement vapor barrier


When I remodeled my basement I found mold between the vapor barrier and basement wall so I tore it all off and bleached the walls. When I framed everything back, I left a 1" air gap between the basement wall and the studs then used unfaced insulation in the walls. I haven't had any problems with it. I have heard of a lot of contractors building new construction houses using expanding foam for their basement wall insulation but it is fairly pricey.
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Old 09-18-2013, 05:45 PM   #13
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http://www.buildingfoundation.umn.ed...jectReview.htm

Gary

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