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4. Exactly what is a concrete vapor barrier?
5. A concrete vapor barrier is any material that stops moisture from entering a layer of concrete. Vapor barriers are utilized because while fresh concrete is poured wet, it’s not supposed to stay like that. It must dry and after that stay dry to stop flooring problems.
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11. If you’ve had a problem with a basement floor (or any concrete floor), you know the type of damage that as well much moisture can cause. Moisture enters concrete in several ways, including through ground, from humidity in the air, via leaky plumbing that passes through a slab. Needless to say, there’s and also the moisture that's in the original concrete mixture.
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13. 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 contact with a resource of moisture, you’re planning to have problems. For this reason a vapor barrier under concrete is vital. Vapor barriers are a great way to maintain moisture from engaging in the concrete.
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15. Note: A vapor barrier is not same as an underlayment. However, there are underlayments that behave as vapor barriers.
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17. Vapor barrier permeability is expressed in perms.
18. Vapor barriers have varying examples of permeability, expressed in perms. The higher the number, the more permeable the pad. Impermeable vapor barriers are the type with a rating of 0.1 perm or fewer while class II vapor retarders are those having a rating in excess of 0.1 perm much less than 1.0 perm.
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20. You’ll hear people while using terms ‘vapor barrier’ and ‘vapor retarder’ interchangeably. However, in fact, they aren’t the same thing. Vapor barriers are less permeable than vapor retarders. In this article, i will be using the term ‘vapor barrier’.
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22. Why's a lot of moisture in concrete a difficulty?
23. One word: adhesives. Excessive moisture in concrete is an issue as it could cause pH changes that destroy adhesives. Here’s what happens.
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25. As moisture makes its approach to the outer lining of the layer of concrete, soluble alkalies come along to the ride and lift its surface pH above that regarding flooring adhesives. This leads to the adhesives to breakdown and you end up getting flooring failures including swelling, bulging, or cupping.
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27. Do you want a vapor barrier within concrete slab?
28. In short, yes. Here’s why.
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30. There’s usually water underneath a structure site. It might not be close to the surface, however that doesn’t mean it’s not there. This water can progress through the soil are available into contact with the bottom of a concrete floor via capillary action. Capillary action could be stopped by using something called a capillary break, a layer of crushed rock which goes relating to the subgrade as well as the slab.
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32. Capillary breaks do an adequate 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 needs to be something within the slab that stops vapor moisture from entering.
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34. There is also a vapor barrier for liability reasons since the majority of manufacturers of flooring include vapor barriers or retarders inside their installation guidelines.
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36. How thick should a plastic vapor barrier be?
37. According to the Guide to Concrete Floor and Slab Construction created by the American Concrete Institute, a vapor retarder mustn't be less than 10 mils thick. You might need a much thicker barrier though if you’re covering material with sharp angles.
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39. Main point here: Vapor barriers must be sufficiently strong enough in order that they don’t easily puncture. Whenever they do, moisture will get in and that’s what you’re trying to keep out.
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