![]() ![]() However, there are underlayments that act as vapor barriers. Note: A vapor barrier is not the same as an underlayment. ![]() Vapor barriers are a way to keep moisture from getting into the concrete. This is why a vapor barrier under concrete is essential. If you have a concrete floor that’s in continuous contact with a source of moisture, you’re going to have problems. There’s only one-way moisture leaves concrete, though, and that’s via its surface. Of course, there’s also the moisture that was in the original concrete mixture. Moisture enters concrete in a variety of ways, including via the ground, from humidity in the air, and through leaky plumbing that passes through a slab. If you’ve ever had a problem with a basement floor (or any concrete floor), you know the kind of damage that too much moisture can cause. It needs to dry and then stay dry to avoid flooring problems. Vapor barriers are used because while fresh concrete is poured wet, it’s not supposed to stay that way.
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