Talk:Vapor barrier: Difference between revisions

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Current thinking has changed the location of the vapor barrier with respect to slab construction. See buildingscience.com, specifically http://www.buildingscience.com/resources/foundations/Understanding_Foundations.pdf

In the older arrangement, the stone or sand on top of the vapor barrier created an excellent situation for an accumulation of water that won't drain off (it could seep in around the edges in high water conditions, either high water table or heavy rains/drainage, and then never escape). This in turn would gradually wick into the basement and keep it humid. Furthermore, the plastic directly under the slab creates an excellent situation for slab curing, as long as it isn't poured too wet. Read the literature, they say it better than I can.

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 Current thinking has changed the location of the vapor barrier with respect to slab construction. See buildingscience.com, specifically http://www.buildingscience.com/resources/foundations/Understanding_Foundations.pdf