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Just what concrete vapor barrier?
 A concrete vapor barrier is any material that stops moisture from entering a concrete slab. Vapor barriers are utilized because while fresh concrete is poured wet, it’s not supposed to stay that way. It needs to dry after which stay dry to prevent flooring problems.
 
 
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 If you’ve ever had a problem with a basement floor (or any concrete floor), you realize the sort of damage that as well much moisture could cause. Moisture enters concrete in many different ways, including through the ground, from humidity in mid-air, and through leaky plumbing that goes through a slab. Naturally, there’s and also the moisture that has been within the original concrete mixture.
 
 There’s only one-way moisture leaves concrete, though, and that’s via its surface. For those who have a concrete floor that’s in continuous exposure to a resource of moisture, you’re going to have problems. For this reason a vapor barrier under concrete is important. Vapor barriers are a way to keep moisture from engaging in the concrete.
 
 Note: A vapor barrier isn't comparable to an underlayment. However, you will find underlayments that work as vapor barriers.
 
 Vapor barrier permeability is expressed in perms.
 Vapor barriers have varying degrees of permeability, expressed in perms. The greater the number, the greater permeable the pad. Impermeable vapor barriers are those having a rating of 0.1 perm or fewer while class II vapor retarders are the type having a rating greater than 0.1 perm and fewer than 1.0 perm.
 
 You’ll hear people while using the terms ‘vapor barrier’ and ‘vapor retarder’ interchangeably. However, strictly speaking, they aren’t the same. Vapor barriers are less permeable than vapor retarders. In the following paragraphs, we'll be while using the term ‘vapor barrier’.
 
 Exactly why is excessive moisture in concrete a challenge?
 One word: adhesives. An excessive amount of moisture in concrete is a dilemma as it can cause pH changes that destroy adhesives. Here’s what happens.
 
 As moisture makes its strategy to the top of an layer of concrete, soluble alkalies arrive for your ride and raise its surface pH above that regarding flooring adhesives. This will cause the adhesives to breakdown so you end up having flooring failures like swelling, bulging, or cupping.
 
 Do you really need a vapor barrier with a layer of concrete?
 In short, yes. Here’s why.
 
 There’s almost always water underneath a structure site. It may not be near the surface, however that doesn’t mean it’s not there. This water can go up from the soil and come into exposure to the bottom of a concrete floor via capillary action. Capillary action may be stopped by installing something known as a capillary break, a layer of crushed rock which goes between your subgrade and also the slab.
 
 Capillary breaks do an adequate job of stopping water in their 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 forestalls vapor moisture from entering.
 
 You might also need a vapor barrier for liability reasons because most manufacturers of flooring include vapor barriers or retarders of their installation guidelines.
 
 How thick should a plastic vapor barrier be?
 According to the Guide to Concrete Floor and Slab Construction provided by the American Concrete Institute, a vapor retarder really should not be less than 10 mils thick. You will need an even thicker barrier though if you’re covering material with sharp angles.
 
 Bottom line: Vapor barriers have to be sufficiently strong enough so they really don’t easily puncture. Should they do, moisture can get in and that’s what you’re attempting to keep out.
 
 
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