Vapor Barriers: Nuisance or Necessity?
Wagner would like to thank Peter Craig for giving us access to this article.
The subject of vapor barriers or retarders beneath concrete slabs on grade has long been controversial. Some justifiably argue that slabs placed in direct contact with a vapor barrier or retarder are more susceptible to curling and other slab problems than those cast on a granular base. They consider a vapor barrier or retarder a downright nuisance.
Others have experienced or witnessed the devastating effect of moisture on modern floor coverings, adhesives, coatings, and a building’s environment. They will justifiably argue that a vapor barrier or retarder beneath the slab…
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Forum Post: MMS- Are some unreliable with high RH?
Hi all. Apologies if this has been covered elsewhere-
We recently consulted on a timber flooring installation moisture-related failure, where a vapour barrier was applied.
The manufacturer subsequently changed their spec sheets to stipulate that, if the moisture content was above a certain level (yes, I said content, not RH- the standards here still make it optional to use either criteria), two coats of their barrier are required instead…
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