How to Reduce Garage Humidity

Written by dario saandvik
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Garages are, by nature, less tightly sealed than houses. Their big doors let in more moisture and cannot close as tightly as normal house doors. Humidity can be a problem if metal tools, dry goods, seed or other materials which should not be exposed to moisture are stored in your garage. Condensation can also form on cold concrete garage slabs, making things even wetter.

Skill level:

Things you need

  • Plastic sheeting
  • Staple gun
  • Dehumidifier
  • Fan or vent

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  1. 1

    Clear the walls of your garage and staple plastic sheeting up against the walls. Since most garages have unfinished walls, the easiest way to do this is to staple the sheeting directly to the studs, from floor to ceiling. This will create a vapour barrier that will prevent moisture from getting into your garage.

  2. 2

    Run a dehumidifier in the garage during the most humid times of day. Consult a humidity meter or some other source of weather information to figure out when it's going to be really humid in your area and run the humidifier at those times. Many models have timers you can set to run at certain times, such as early morning and dusk.

  3. 3

    Run a small fan in the garage to keep condensation from forming on metal surfaces or install a small vent in one of your garage walls

Tips and warnings

  • Paint can act as a vapour barrier, so if your prefer something more colourful than plastic sheeting you can paint the inside walls of your garage to keep more moisture out. If the garage is has finished walls, you can also caulk the joints between walls, floor and ceiling.

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