Details You Need To Be Informed About Concrete Vapor Barrier

Just what is a concrete vapor barrier?
A concrete vapor barrier is any material that stops moisture from entering a concrete slab. Vapor barriers are employed because while fresh concrete is poured wet, it’s not supposed to stay this way. It has to dry and after that stay dry to avoid flooring problems.

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If you’ve ever endured a problem with a basement floor (or any concrete floor), you understand the kind of damage that too much moisture might cause. Moisture enters concrete in several ways, including through the ground, from humidity in the air, via leaky plumbing that goes through a slab. Needless to say, there’s even the moisture that was inside the original concrete mixture.

There’s only one-way moisture leaves concrete, though, and that’s via its surface. In case you have a concrete floor that’s in continuous exposure to a resource of moisture, you’re gonna have issues. This is why a vapor barrier under concrete is important. Vapor barriers are a good way to keep moisture from getting yourself into the concrete.

Note: A vapor barrier isn't comparable to an underlayment. However, you'll 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 larger the number, the more permeable the pad. Impermeable vapor barriers are the ones which has a rating of 0.1 perm or less while class II vapor retarders are the type with a rating in excess of 0.1 perm much less than 1.0 perm.

You’ll hear people using the terms ‘vapor barrier’ and ‘vapor retarder’ interchangeably. However, as it happens, they aren’t exactly the same thing. Vapor barriers are less permeable than vapor retarders. In this post, we'll be using the term ‘vapor barrier’.

Exactly why is too much moisture in concrete a challenge?
A word: adhesives. A lot of moisture in concrete is a problem because it could cause pH changes that destroy adhesives. Here’s what goes on.

As moisture makes its method to the outer lining of a layer of concrete, soluble alkalies appear to the ride and raise its surface pH above those of flooring adhesives. This will cause the adhesives to breakdown and also you end up getting flooring failures for example swelling, bulging, or cupping.

Do you want a vapor barrier within layer of concrete?
In short, yes. Here’s why.

There’s more often than not water underneath a building site. It may not be near the surface, but that doesn’t mean it’s not there. This water can progress with the soil and are available into exposure to the bottom of a concrete floor via capillary action. Capillary action can be stopped by using something termed as a capillary break, a layer of crushed rock that goes between your subgrade and also the slab.

Capillary breaks do a sufficient job of stopping water rolling around 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 under the slab that stops vapor moisture from entering.

You have to a vapor barrier for liability reasons since the majority manufacturers of flooring include vapor barriers or retarders inside their installation guidelines.

How thick should a plastic vapor barrier be?
According to the Help guide to Concrete Floor and Slab Construction authored by the American Concrete Institute, a vapor retarder shouldn't be less than 10 mils thick. You will need an even thicker barrier though if you’re covering material with sharp angles.

Main point here: Vapor barriers must be sufficiently strong enough enough so they really don’t easily puncture. Whenever they do, moisture are certain to get in and that’s what you’re always keeping out.

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Pub: 22 Feb 2023 11:12 UTC
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