Exactly what is a concrete vapor barrier? 
A concrete vapor barrier is any material that stops moisture from entering a layer of concrete. Vapor barriers are utilized because while fresh concrete flows wet, it’s not supposed to stay that way. It must dry then stay dry to prevent flooring problems. 
 
 
 
 
 
If you’ve ever had an issue with a basement floor (or any concrete floor), you understand the type of damage this too much moisture might cause. Moisture enters concrete in a variety of ways, including through ground, from humidity in mid-air, and through leaky plumbing that passes through a slab. Naturally, there’s and also the moisture that has been in the original concrete mixture. 
 
There’s only one-way moisture leaves concrete, though, and that’s via its surface. When you have a concrete floor that’s in continuous connection with a source of moisture, you’re gonna have problems. This is the reason a vapor barrier under concrete is crucial. Vapor barriers are a great way to hold moisture from stepping into the concrete. 
 
Note: A vapor barrier is not same as an underlayment. However, you can find underlayments that become vapor barriers. 
 
Vapor barrier permeability is expressed in perms. 
Vapor barriers have varying degrees of permeability, expressed in perms. The larger the number, the more permeable the pad. Impermeable vapor barriers are the types using a rating of 0.1 perm or fewer while class II vapor retarders are the ones which has a rating more than 0.1 perm and less than 1.0 perm. 
 
You’ll hear people with all the terms ‘vapor barrier’ and ‘vapor retarder’ interchangeably. However, as it happens, they aren’t the same. Vapor barriers are less permeable than vapor retarders. In the following paragraphs, i will be using the term ‘vapor barrier’. 
 
Exactly why is excessive moisture in concrete a challenge? 
A word: adhesives. A lot of moisture in concrete is a problem given it can cause pH changes that destroy adhesives. Here’s what happens. 
 
As moisture makes its method to the counter of a concrete slab, soluble alkalies come along for that ride and raise its surface pH above that regarding flooring adhesives. This makes the adhesives to breakdown and you get flooring failures for example swelling, bulging, or cupping. 
 
Do you need a vapor barrier with a layer of concrete? 
In a word, yes. Here’s why. 
 
There’s typically water underneath a building site. It may not be at the surface, but that doesn’t mean it’s not there. This water can move up over the soil and come into experience of the foot of a concrete floor via capillary action. Capillary action may be stopped by using something referred to as a capillary break, a layer of crushed rock which goes between the subgrade and the slab. 
 
Capillary breaks do an adequate job of stopping water in its liquid state from reaching a slab. However, they can’t stop water in vapor form from reaching and entering a concrete slab. Therefore, there must be something within the slab that stops vapor moisture from entering. 
 
You have to a vapor barrier for liability reasons since most manufacturers of flooring include vapor barriers or retarders of their installation guidelines. 
 
How thick should a plastic vapor barrier be? 
In line with the Self-help guide to Concrete Floor and Slab Construction provided by the American Concrete Institute, a vapor retarder shouldn't be less than 10 mils thick. You need an even thicker barrier though if you’re covering material with sharp angles. 
 
Important thing: Vapor barriers must be sufficiently strong enough so that they don’t easily puncture. Whenever they do, moisture can get in and that’s what you’re trying to keep out. 
 
 
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