Notes

Points You Need To Be Informed On Concrete Vapor Barrier




Just what is a concrete vapor barrier?
A concrete vapor barrier is any material that forestalls moisture from entering a concrete slab. Vapor barriers are used because while fresh concrete flows wet, it’s not likely to stay this way. It needs to dry and then stay dry to prevent flooring problems.





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 a variety of ways, including through the ground, from humidity up, and throughout leaky plumbing that goes through a slab. Obviously, there’s the moisture that has been from 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 likely to have problems. For this reason a vapor barrier under concrete is essential. Vapor barriers are a great way to maintain moisture from getting into the concrete.

Note: A vapor barrier isn't same as an underlayment. However, you can find underlayments that act as vapor barriers.

Vapor barrier permeability is expressed in perms.
Vapor barriers have varying levels of permeability, expressed in perms. The higher the number, the more permeable the fabric. Impermeable vapor barriers are the type which has a rating of 0.1 perm or less while class II vapor retarders are the type which has a rating greater than 0.1 perm and fewer than 1.0 perm.

You’ll hear people with all the terms ‘vapor barrier’ and ‘vapor retarder’ interchangeably. However, strictly speaking, they aren’t a similar thing. Vapor barriers are less permeable than vapor retarders. In this post, i will be with all the term ‘vapor barrier’.

Why's an excessive amount of moisture in concrete a challenge?
A word: adhesives. An excessive amount of moisture in concrete is a concern as it may 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 come along for the ride and lift its surface pH above that of flooring adhesives. This makes the adhesives to breakdown so you end up with flooring failures such as swelling, bulging, or cupping.

Do you really need a vapor barrier with a layer of concrete?
In a word, yes. Here’s why.

There’s more often than not water underneath a structure site. It might not be at the surface, however that doesn’t mean it’s not there. This water can progress over the soil and are avalable into connection with the foot of a concrete floor via capillary action. Capillary action can be stopped by installing something termed as a capillary break, a layer of crushed rock that goes between your subgrade and also the slab.

Capillary breaks do a passable 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 prevents vapor moisture from entering.

There is also a vapor barrier for liability reasons since the majority manufacturers of flooring include vapor barriers or retarders in their installation guidelines.

How thick should a plastic vapor barrier be?
Based on the Guide to Concrete Floor and Slab Construction created by the American Concrete Institute, a vapor retarder mustn't be lower than 10 mils thick. You may want a level thicker barrier though if you’re covering material with sharp angles.

Important thing: Vapor barriers should be strong enough so they don’t easily puncture. Should they do, moisture is certain to get in and that’s what you’re always keeping out.


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