Oct 08, 2013, 11:36 PMJBeyer75
I am currently finishing my basement and have a question on where the vapor barrier should be. I live in the mid-west United States, in St. Louis, MO. We have very hot and very cold seasons.
I currently have a vapor barrier that is just a think polyethylene plastic sheet that drapes down the concrete wall and is under the bottom framing member (metal studs), so it is between the framing and the concrete wall.
I am getting contradicting information, but more information is telling me that it needs to be on the inside of the framing before the Sheetrock/drywall.
Can someone confirm the correct location of the vapor barrier? Or if it is necessary at all? Also, what type of insulation should I use if any?
Oct 09, 2013, 09:52 AMSparky617
Here is a great article from a source I trust. http://www.buildingscience.com...sement+vapor+barrier
First thing I would do is test your basement walls and floor for water vapor penetration from the ground. Tape a piece of plastic or aluminum foil to the wall in several places and on the floor in several places. Tape all four sides, if after a few days the wall or floor behind the foil is wet you have water vapor coming in from the ground. YOU DO NOT want to encase this in plastic, you will cause mold problems if you do. A coat of dry-loc or Thoroseal can keep water vapor at bay. Craftpaper facing on fiberglass is all you want for a vapor barrier in a basement. Using a drywall without a paper face is a good thing on below grade walls as well.