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    hottown1 posted an update 1 year, 1 month ago

    Exactly what is a concrete vapor barrier?

    A concrete vapor barrier is any material that forestalls moisture from entering a layer of concrete. Vapor barriers are used because while fresh concrete flows wet, it’s not designed to stay doing this. It requires to dry then stay dry in order to avoid flooring problems.

    If you’ve had a problem with a basement floor (or any concrete floor), you already know the type of damage that too much moisture could cause. Moisture enters concrete in many different ways, including through ground, from humidity via a flight, via leaky plumbing that passes through a slab. Naturally, there’s the moisture which was from 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 exposure to a resource of moisture, you’re going to have issues. This is the reason a vapor barrier under concrete is essential. Vapor barriers are a way to hold moisture from getting into the concrete.

    Note: A vapor barrier isn’t the just like an underlayment. However, you’ll find underlayments that work as vapor barriers.

    Vapor barrier permeability is expressed in perms.

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

    You’ll hear people while using 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, we’ll be while using term ‘vapor barrier’.

    How come a lot of moisture in concrete an issue?

    A word: adhesives. Excessive moisture in concrete is a problem because it could cause pH changes that destroy adhesives. Here’s what goes on.

    As moisture makes its strategy to the surface of the layer of concrete, soluble alkalies arrive for your ride and lift its surface pH above those of flooring adhesives. This will cause the adhesives to breakdown and also you end up having flooring failures including swelling, bulging, or cupping.

    Do you require a vapor barrier under a concrete slab?

    In short, yes. Here’s why.

    There’s typically water underneath a structure site. It might not be close to the surface, but that doesn’t mean it’s not there. This water can progress from the soil and are available into experience of the bottom of a concrete floor via capillary action. Capillary action may be stopped by using something known as a capillary break, a layer of crushed rock that goes between your subgrade and the slab.

    Capillary breaks do a good job of stopping water in the 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 beneath the slab that forestalls vapor moisture from entering.

    You might also need a vapor barrier for liability reasons since the majority manufacturers of flooring include vapor barriers or retarders within their installation guidelines.

    How thick should a plastic vapor barrier be?

    Based on the Help guide Concrete Floor and Slab Construction authored by the American Concrete Institute, a vapor retarder mustn’t be lower than 10 mils thick. You might need an even thicker barrier though if you’re covering material with sharp angles.

    Bottom line: Vapor barriers need to be strong enough so that they 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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