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Fixing Moisture Problems on a Concrete Slab

By Angela Baird ; Updated September 21, 2017
Concrete must be properly dried before covering.

While moisture has always been an issue when installing flooring over a concrete slab, according to Peter Craig with Concrete Construction, the problems with it seem to be more common today. He suggests that it is the speed with which things are done; the concrete simply isn't allowed time to dry properly before any installation is made. There are ways to accelerate the rate at which moisture leaves the concrete slab, which will ensure success when covering the concrete.

Allow the slab sufficient time to dry naturally. According to Plant Services, this takes upwards of 168 days in ideal conditions.

Ventilate the area containing the concrete. Ventilation allows the evaporating moisture an outlet, rather than having it hang in the air and fall back onto the concrete.

Use fans or blowers. Moving air is shown to triple evaporation rates.

Apply heat. According to TWResin Technologies, forced air heat works the most effectively.

Dehumidify the area containing the concrete. Removing excess moisture from the air also draws excess moisture from the concrete slab.


Things You Will Need

  • Fans or blowers
  • Dehumidifier
  • Vapor barrier


  • Placing a good vapor barrier not only between the slab and your flooring, but also beneath the slab will prevent it from transmitting moisture from the soil.


  • Direct fired heat has the opposite effect of raising the humidity and retarding the drying process.

About the Author


Angela Baird has been writing professionally since 1995. She has a wide range of life experiences from work with abused animals with the Humane Society, to more than 20 years of hands-on experience in the culinary arts. In addition, she keeps horses and does her own home improvements and home gardening.