In your specifications for your buildings do you see Vapor Retarders ASTM E-1745 Class A, B or C, 6mil, 10mil or 15mil? If so, do you know that they are looking for something besides regular poly? Vapor retarders have been around for a few years and are considerably more expensive than regular 6mil or 10mil poly sheeting. Many builders see that a 10mil is specified and still use regular 10mil poly. Vapor retarders provide less permeability and more durability prior to the slab being poured. Raven Industries explains the basics of Vapor retarders in the link below.
http://www.ravenind.com/RavenCorporate/films/pdf/VRSGuide.pdf
They also talk specifically about their products but it is good information to read.
Another great article to read is one by Bruce A Suprenant, PhD, PE, FACI. I found this online searching for good articles that would explain the vapor retarders and barriers better. He provides information and testing results. It seems that one of the more important things to be careful of is the small puncture holes that may happen on a jobsite. Like all water prevention products, you need to fix even the smallest of holes that happen. You can read his article by clicking on the below link.
http://www.concretesdc.org/FloorMoisture/Chapter_6_Vapor_Retarder-Barrier.pdf
The forum I have created here is merely a chance to skim the surface of vapor retarders. If you are the least bit confused by some of this don't feel bad, sometimes I am too. As with any building's specification book you need to make sure the products you use match the specifications.
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