Basement dehumidifiers can be effective, but some homeowners get frustrated when humidity levels continue to rise after purchasing one. If you run your dehumidifier regularly and notice humidity keeps creeping up, it could be due to one or more issues that allow moisture into your basement. The dehumidifier may be treating the symptom of humidity, rather than fixing the root cause of the problem.
Knowing why humidity persists can help homeowners uncover basement moisture issues and develop a more complete solution.
Why Does Basement Humidity Keep Returning?
Basement humidity is returning because excess moisture is still finding its way into the basement. A dehumidifier will remove water vapor from the air, but it can’t stop new sources of moisture from migrating indoors.
Foundation leaks, drainage problems, air infiltration, condensation, and plumbing leaks are common sources that will keep humidity returning if not addressed.
Is Your Dehumidifier the Right Size for the Basement?
If your dehumidifier is too small or low-capacity for your basement, it may not keep up with moisture levels. The dehumidifier can run continuously without lowering humidity if it can’t remove moisture as quickly as it enters.
Basements with larger square footage, finished basements, and other areas with significant moisture may require larger-capacity dehumidifiers. Selecting a unit that matches your basement size and humidity levels is important.
Can Foundation Cracks Increase Humidity?
Yes, cracks in the foundation can allow moisture to seep into your basement. Small cracks can allow water vapor or groundwater to slowly move into your basement.
Over time, water seeping into your basement from foundation walls or the floor can increase humidity levels. Consider having a professional inspect your foundation to identify any cracks that should be waterproofed or repaired.
How Does Poor Exterior Drainage Affect Basement Humidity?
Poor drainage is another leading cause of a moist basement. When rainwater pools around the foundation, it can build up pressure against your basement walls. This hydrostatic pressure can eventually force moisture inside.
Some common drainage issues include:
- Clogged gutters
- Short downspouts
- Lack of grading
- Standing water near foundation
- Drainage system failure
Fixing water drainage issues outside of your home can sometimes drastically reduce basement humidity levels.
Can Air Leaks Make Basement Humidity Worse?
Air leaks can allow humid outdoor air into the basement. During the summer and warm seasons, humid air can enter basements through gaps, cracks, open windows, and penetrations for utility lines.
Once humid air enters a cooler space, condensation can form on surfaces such as walls and pipes. Sealing basement air leaks can reduce moisture infiltration and help you save money on energy bills.
Why Does Condensation Form in Basements?
Condensation occurs when warm, humid air comes into contact with cool surfaces. Because basements tend to be cooler than other areas of the home, they are prone to condensation.
Common places to find condensation in basements include:
- Water pipes
- HVAC ductwork
- Basement walls
- Windows
- Water heater
Controlling temperature and humidity levels can often prevent condensation from forming.
Could Plumbing Leaks Be Contributing to Humidity?
Hidden plumbing leaks can also cause your basement to feel more humid. Even minor leaks along walls, underneath flooring, and near appliances can allow moisture into the air.
Look for signs of plumbing leaks on any exposed pipes, around water heaters, and on appliances like washing machines and sump pumps. Catching leaks early can help prevent major issues later.
Does Basement Insulation Affect Humidity Levels?
Insulation can also make a difference by preventing extreme surface temperatures that lead to condensation. Cold spots on uninsulated basement walls, pipes, and ductwork can promote condensation.
Adding insulation to these areas can help keep more consistent temperatures in your basement and reduce overall humidity.
Can Crawl Spaces Impact Basement Humidity?
Crawl spaces can also affect overall humidity in your home. If the crawl space has high humidity, it can work its way into your living spaces and basement.
Issues within crawl spaces include:
- Standing water
- Poor or nonexistent vapor barriers
- Poor ventilation
- Moisture coming in from the ground
Addressing crawl space moisture issues can help you improve indoor humidity.
Why Does Humidity Rise During Certain Times of the Year?
Weather and seasonal changes can play a factor in rising humidity. Humidity often rises in spring and summer as outdoor air contains more moisture.
Spring showers, excess groundwater, and warmer temperatures can also increase your basement’s humidity. Many homeowners notice their basement dehumidifier runs more frequently during humid months.
Should Basement Windows Be Opened to Reduce Humidity?
Opening basement windows is not always recommended. While it might seem like ventilating the basement would help, it can make humidity worse if you live in a humid climate.
Opening windows can allow moisture from outside to enter your basement. Rather than decreasing humidity, it might increase humidity levels.
Can Mold Growth Be a Sign of Excess Humidity?
Mold growth is a common sign of excess moisture in your home. Mold can easily grow in basement spaces when humidity remains high for too long.
Other signs of excess humidity include:
- Musty odors
- Visible mildew
- Water stains
- Paint blistering
- Buckling wood
- Condensation on surfaces
Look for sources of excess moisture if you suspect you have a mold problem.
When Should a Professional Inspect a Humid Basement?
You may want to hire a professional if you’ve tried using a dehumidifier and humidity levels are still too high. Most moisture problems are caused by water entering the home or by poor drainage around the foundation.
Experts can identify water intrusion points, evaluate your home’s drainage, check for insulation issues, detect air leaks, and find sources of excess humidity. Hiring a professional gives you a comprehensive solution rather than attempting to control humidity levels with a dehumidifier.
Why Does Basement Humidity Keep Creeping Up, Even After Buying a Dehumidifier?
Several factors can cause basement humidity to keep increasing. As long as water continues to enter the basement, humidity levels can remain high. Pay attention to foundation cracks, drainage problems, air leaks, condensation, plumbing issues, and seasonal changes that may impact your basement.
A basement dehumidifier can help, but homeowners usually need to fix the root cause of excess moisture. For more basement-related tips or to have a technician inspect your home, contact Turning Point Home Solutions. We can help you find solutions that create a more comfortable, healthy home environment.
