How Moisture and Humidity Affect Your Garage and Things You Can Do to Protect It

5/15/24, 9:59 PM

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It is normal for us to wipe moisture from our brows on a hot day, but should it be normal for our garage floor to sweat? The answer is most definitely no. A sweaty floor and high moisture content in your garage ends up creating a slippery surface and damp walls.

How Moisture Builds Up in Your Garage

The most common reason moisture builds up in your garage is a sweaty floor. If you have a concrete floor, when warm air comes into contact with the cool concrete, it will cause the air to cool to below the dew point and result in condensation on the surface. As the moisture in the air condensates in your garage, it increases the humidity dramatically. Not worried about a garage that sweats as much as you do? You probably should be.

How Moisture and Humidity Affect Your Garage

Over time, excess humidity and moisture can negatively impact your garage. Moisture eventually breaks down the foundation of your garage. Mold and mildew are faster foes, however. They can grow in a season and cause rot to set in the wood of the building and health issues for occupants. Moisture also causes your tools, storage units and vehicles to break down much faster.

Things You Can Do to Protect Your Garage

You will often notice that springtime is when your garage starts to build up moisture and continues through the hot summer when the air is warmer. There are multiple things you can do if you want to protect your garage.

Check the Drains

Before you install anything new or run an electronic device to try to rid your garage of extra moisture, you should make sure the problem isn’t internal. Check all your drains and gutters to ensure they are unobstructed and working properly. If they are leaking anywhere or backed up, they can cause the build of excess moisture.


Once you make sure everything is functioning properly, you can get a garage dehumidifier. They are great at getting excessive moisture out of a room and preventing mold and rot from going rampant.

Add Ventilation

Ventilating your garage is another one of the best, long-term ways you can protect your garage from extra humidity. Installing an exhaust fan is an easier way to go about this. While it isn’t quite as simple as plugging in a dehumidifier, it is more energy-efficient in the long run.

You can also do this somewhat effectively by installing more windows or passive vents in the walls of your garage. Installing storm windows can help, especially if you can put them on a side facing the sun to have the sunlight evaporate the moisture during the day.

Air Conditioning

For those of you who use your garage as a workshop or a man cave and have it air-conditioned, it is time to put that air conditioner to use. The vast majority of air conditioners work to reduce moisture levels in the air since they evaporate it as they run.

Floor Coating

Finally, one of the best and most permanent ways to cut down on condensation is to apply a floor coating to your garage. You should consider using a coating made for a wet environment to help out the most.

If you need more advice on garage maintenance or want a high-quality floor coating, contact our garage experts at Carolina Custom Garages.

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