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Why Are My Walls Sweaty?

condensation on windows

When walking through your home, you don’t want to see wet or sweaty walls. This could be an issue due to humidity levels in your home.

When the moisture builds-up and drips down the walls and onto the floors it can cause issues like mold, mildew, rot, and strong unpleasant odors.


Condensation on walls and mirrors is common when you get out of the shower, but it shouldn’t be happening on every wall in your house on a daily basis.

Ventilation in your home is key to keeping humidity levels steady. When your home is airtight it can be more prone to wall sweating.

Try increasing ventilation by installing exhaust fans in rooms prone to high humidity and moisture levels, like laundry rooms and bathrooms.


If your humidity levels inside your home are above 50% it is too high. With high humidity comes decreased indoor air quality, due to the increased levels of pollutants such as dust mites, mold, mildew, and bacteria.

Besides sweaty walls, other signs of high humidity include:

  • Moist air

  • Foggy windows

  • Strong mildew odor

  • Mold

  • Increased allergies

  • Rotting wood and walls

Humidity levels can be adjusted by installing dehumidifiers and other indoor air quality devices to help control levels and lessen pollutants inside your household.


Leaks would seem like an obvious reason from wet or sweaty walls. If water or moisture is on the walls or inside the walls it could be from a roof leak or a pipe leak.

These leaks can be harmful to your home if left unnoticed and can potentially cause major damage.

Be sure to call a professional at the first sight of a leak to save you time and money.

Korrect Plumbing, Heating & Air Conditioning, Inc., are experts within the Dayton, Ohio and surrounding area and can provide top-notch assistance in indoor air quality. Call us at (937) 837-2333 for all your plumbing, drain, heating, and air needs.