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The use of under slab vapor retarders/barriers has long been regarded as an effective, economical way to control moisture migration through concrete. The proper installation of an effective vapor retarder/barrier beneath the concrete has been proven to reduce or eliminate issues that arise when moisture migrates into interior spaces, including the adverse effects such moisture has on floor covering and coating systems, as well as compromised indoor air quality due to the development of fungus, mildew and mold.
W. R. MEADOWS was the innovator that identified the problem early on relating to vapor permeance and membranes getting punctured during installation. In the 1950s, we pioneered the exclusive PREMOULDED® MEMBRANE WITH PLASMATIC® CORE that is still in use today when your retarder/barrier absolutely has to be tough enough. While low permeability, high strength and durability are all important selection and specification criteria for under slab vapor retarders/barriers, there is some speculation about which of these performance characteristics is most important when choosing the right vapor retarder/barrier for a project. This paper explores the industry standards governing under slab vapor retarder/barrier performance and identifies critical product characteristics that should be considered when determining what level of under slab vapor protection to specify for a particular application.
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