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How to Fix Moisture Problems in a Garage Floor

Updated February 21, 2017

Effective moisture control is essential to maintaining your garage. Too much moisture can cause mould and mildew growth, which can damage your garage and cause respiratory problems. Moreover, excessive moisture may cause pitting and cracks in your garage floor. If you are experiencing moisture problems in your garage floor, there are several things you can do to remedy the situation.

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  1. Run a dehumidifier. Dehumidifiers work best in confined areas, such as a garage. Dale Dorman, extension housing and environment specialist at the University of Georgia, recommends using a dehumidifier that condenses a specific amount of moisture each 24 hours at 26.7 degrees C and 60 per cent relative humidity for a garage in which the walls are visibly sweating or seeping with moisture. The measurements are:

  2. 500 square foot garage = 14 pints

  3. 1,000 square foot garage = 20 pints

  4. 1,500 square foot garage = 26 pints

  5. 2,000 square foot garage = 32 pints

  6. Lay a vapour barrier on the floor of the crawl space under your garage. If your crawl space is located under your garage, laying a vapour barrier, sometimes called a moisture barrier, will help prevent condensation of moisture on the garage floor.

  7. Insulate your garage. Insulation increases the temperature of the inside walls, ceilings and floors, and this prevents moisture condensation. Make sure the insulation is installed properly, as poorly installed insulation may allow cold air to pass through into the garage and cause moisture condensation.

  8. Make sure dryer systems are vented outdoors and not into the garage. Moreover, kerosene heaters, gas logs and other combustible appliances should be vented to the outside because they produce water vapour.

  9. Open garage windows and doors when possible. Simple ventilation can be used to control relative humidity, resulting in less moisture accumulating on the garage floor. Relative humidity should be kept between 25 to 50 per cent to avoid many of the problems associated with excess moisture. You can purchase a hygrometer at most hardware stores to measure relative humidity.

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About the Author

Thomas King is a graduate of the University of Pittsburgh School of Law where he served as managing editor of the "Pittsburgh Journal of Environmental and Public Health Law." He currently lives in Aberdeen, Washington where he writes and practices law.

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