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Old 02-13-2014, 07:56 AM   #1
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Vapour Barrier option in basement


Just finishing an insulation upgrade in basement prior to adding living space and am wondering about vapour barrier. I always find the joist pockets troublesome to install vapour barrier in and was wondering if it wouldn't be better to vapour barrier the walls up to the top plate of stud wall and then also apply vapour barrier on the ceiling as well? This way would achieve the barrier I want and avoid having to mess with the joist pockets. Is it ok to vapour barrier the ceiling in a basement? This will be finished heated space. Thanks.

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Old 02-13-2014, 08:19 AM   #2
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Vapour Barrier option in basement


I see no good reason for either for a VB or insulation when used as a living space. My living space basement ceiling is concrete and it hasn't needed a vapor barrier or insulation in 30 years.

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Old 02-13-2014, 11:20 AM   #3
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Old 02-13-2014, 11:28 AM   #4
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I am in Nova Scotia.
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Old 02-13-2014, 09:36 PM   #5
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Vapour Barrier option in basement


Just staple the VB in the best you can. Acoustic seal could help or tuck tape but isn't necessary. Do not VB between warm zones. VB stops condensation from cold to warm.
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Old 02-14-2014, 08:10 AM   #6
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Vapour Barrier option in basement


There is a bunch of information out there regarding basement insulation strategies in cold zones.

I would suggest you start there. I don't like plastic vapor barriers as they usually wind up being a bigger issue as compared to a solution.
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Old 02-14-2014, 08:25 AM   #7
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Vapour Barrier option in basement


Vapor barriers are a thing of the past, experience is showing they are not needed and cause more harm than good. They trap vapor instead of prevent it, and can lead to mold.
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Old 02-14-2014, 03:33 PM   #8
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Vapour Barrier option in basement


In very cold locations, a Class 1 VB will work, it is when there is summertime warming that condensation may spike; http://www.buildingscience.com/docum...commendations/

Most of the US shouldn't require poly but in high Zones- 7,8; under the correct applications- it is fine; ftp://ftp.cmhc-schl.gc.ca/chic-ccdh/..._Web_sept5.pdf

No poly-wrapped FG anywhere; http://www.buildingscience.com/docum...Insulation.pdf

Zone 6, poly is risky with moisture problems- Case#3; http://www.google.com/url?sa=t&rct=j...,d.cGU&cad=rja

Gary
PS. Read last paragraph; http://www.buildingfoundation.umn.ed...oistphenom.htm

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Last edited by Gary in WA; 02-14-2014 at 03:37 PM.
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