
Mold is a serious problem that can negatively affect your health. Mold spores can be released into the air, which can cause allergic reactions and respiratory problems. If you have mold on your windows or window sills and are interested in preventing mold, read this article to understand the dos and don’ts of mold and windows.
What causes mold on windows?
Mold spores love damp, warm places. In the summer, mold can form on windows that don’t have air conditioning or aren’t well-ventilated. The spores thrive in humid conditions and will grow on any surface that is moist.

When the temperature outside is hot and the moist indoor air of your home is cool, the difference in temperature creates window condensation which is the perfect environment for mold to grow. Moist air inside with cold weather outside only enhances the conditions that encourage mold growth.
Single pane versus double pane glass
One way to prevent mold is to install double-pane glass, also known as insulated glass. Double-pane glass helps to reduce condensation because it eliminates the temperature difference between the inside and outside of your home. The two layers of glass are separated by a space that is filled with air or gas. This space acts as an insulator, which prevents the inside pane of glass from getting as cold as the outside pane. When the inside pane of glass is not as cold, the condensation will be reduced, and mold will have a harder time growing.
If you are interested in preventing mold or reducing condensation, double-pane glass is a great option.
Wood Windows & Mold Growth
Windows can rot if they get too much moisture, so it’s important to prevent mold growth.
Mold loves wood because it is a natural material that is full of cellulose. Cellulose is a food source for mold, so when mold spores land on wood, they will start to grow and multiply. If the wood is not properly sealed or protected, mold can easily take hold and start to cause damage.

One way to prevent mold on windows is to make sure that the wood is properly sealed. A sealant will create a barrier between the wood and the outside air. This will help to keep moisture out, which will make it harder for mold to grow.
You can also use a dehumidifier to help reduce the moisture in the air, which will make it harder for mold to grow. If you have wood windows, it’s important to take steps to prevent mold growth. Sealing the wood and using a dehumidifier can help to create an environment that is not conducive to mold growth.
How to Remove and Stop Mold Growth on Windows?
Removing mold from windows is a two-step process. First, you must clean the mold off of the surface of the window including the window sills. Second, you must address the conditions that allowed the mold to grow in the first place.
There are a few things you can do to stop mold from growing on your windows or window sill. Make sure your windows are clean and free of dirt and dust. Wipe them down with a damp cloth regularly. If possible, open your windows to let in the fresh air and help keep the humidity level low, or use an exhaust fan to regulate the indoor damp air throughout your home.
It is also best to try and limit or reduce the number of indoor plants in the winter due to the increased level of moisture they can produce.
How does mold affect your health?
Mold can cause a variety of health problems, including allergic reactions, respiratory problems, and infections. Some people are more sensitive to mold than others. If you have asthma or allergies, you may be at an increased risk of having a reaction to mold.

Mold spores can cause respiratory problems when they’re inhaled. The spores can also cause infections if they get into your eyes, skin, or digestive system. If you have a weakened immune system, you may be at an increased risk of developing a serious infection from mold.
Mold Allergies
If you’re allergic to mold, you may experience a variety of symptoms when you’re exposed to it. These symptoms can range from mild to severe and can include:
- Coughing
- Sneezing
- Runny nose
- Itchy eyes
- Watery eyes
- Skin rash
- Difficulty breathing
If you have asthma, exposure to mold can trigger an asthma attack. Reactions to mold can also make it difficult to breathe and may cause you to develop a respiratory infection. If you have a weakened immune system, you may be at an increased risk of developing a serious infection from mold.
If you suspect that you’re allergic to mold, see your doctor. They can perform tests to determine if you’re allergic to mold and help you develop a treatment plan.
Reducing the amount of moisture on your window frames is the best way to prevent mold. You can do this by:
- Installing double-pane glass
- Wipe down your window frames regularly
- Opening windows regularly will improve indoor air quality
- Keeping the humidity level low in your home
- use exhaust fans to vent moist air
Being aware of possible mold areas in your home and recognizing them early is very important in preventing mold. Inspecting your window frames regularly and taking action if you see any mold growth is the best way to prevent a problem. When mold is left to grow it can wreak havoc on any structure in a short amount of time.
How to clean mold off of windows
If you already have mold or mold damage on your windows, don’t panic. With a little elbow grease and the right cleaners, you can remove mold and prevent it from coming back.
What you’ll need:
- Rubber gloves
- spray bottle
- Goggles
- Vinegar
- Baking soda
- Water
- Sponge or cleaning cloth
First, put on your rubber gloves and goggles to protect yourself from the mold.
- Next, mix equal parts vinegar and water in a bowl.
- Dip your sponge or cleaning cloth into the mixture and wring it out so it’s damp, not wet, or apply the mixture with a spray bottle.
- Scrub the moldy areas of your window with a sponge or cloth.
- Once you’ve scrubbed all the mold off of your window, mix a solution of one teaspoon of baking soda and one cup of water.
- Use a sponge or cloth to apply the baking soda solution to your window.
- Rinse the window with clean water.
- Completely Dry the window with a clean towel.
Once your window frame is dry, open it up to let in some fresh air.
You should clean your windows regularly to prevent mold and mildew from growing. Wipe them down with a damp cloth at least once a week, and open them up to make the indoor air quality fresh whenever possible. If you live in an area with high humidity, you may need to clean your windows more often and keep your windows open periodically to let in the fresh air.
Note that bleach can be used as well instead of vinegar but bleach is very dangerous to the human body and to wood and sheetrock and other building materials often encountered with mold on a window.
Treating mold that has spread to drywall or sheetrock
If mold has already begun to grow on your drywall or sheetrock, you’ll need to take action to remove it and prevent it from coming back.
Start by removing any moldy drywall or sheetrock. Cut out the affected area with a utility knife and discard it in a heavy-duty garbage bag.
Next, use a wire brush to remove any mold that remains on the surface of the exposed wood or sheetrock.
Once you’ve removed all the mold, you’ll need to clean the area with a bleach solution. To make a bleach solution, mix one cup of bleach with one gallon of water.
Apply the bleach solution to the affected area with a sponge or cloth and scrub until the mold is gone.
Rinse the area with clean water and allow it to air dry completely.
Once the area is dry, you’ll need to apply a sealant to prevent mold from coming back. There are many sealants available at your local hardware store.
Note that it is in most cases better to call a professional mold remediation company to assist you with mold remediation and removal. You and your family deserve to have a clean and mold-free environment to live in. At Certified Mold Inspection we can handle your job anywhere in the United States.
Treating Mold Allergies
There is no cure for mold allergens, but there are ways to manage your symptoms. If you’re allergic to mold, avoid exposure to it as much as possible. Keep your window sills clean and your windows open periodically and use an indoor air conditioner or dehumidifier to reduce the amount of excess moisture or moisture buildup in your home.

If you have asthma, be sure to keep your asthma medication with you at all times in case you have an asthma attack. If you have a severe reaction to mold, you may need to be treated with emergency medication or even hospitalization.
Preventing Mold
The best way to prevent mold is to avoid exposure to mold. Keep your windows clean and open, and use an air conditioner or dehumidifier to reduce or prevent condensation in your home. If you live in an area with high humidity, you may need to clean your windows more often. Be sure to inspect your home regularly for mold and take action immediately if you see any. If you have asthma, be sure to keep your asthma medication with you at all times in case you have an asthma attack. If you have a severe reaction to mold, you may need to be treated with emergency medication or even hospitalization.
Risks of Invisible Mold
Note that with visible mold identified in a home or office it is very common to find the problem is much worse in areas you can’t see such as behind the sheetrock, under the home, or in the attic. As a result mold testing can make sure your total environment is free from the ravages of mold even in areas you can’t see.
Conclusion
Window condensation and the resulting mold growth can be a serious problem in homes. The good news is that there are steps that can be taken to prevent mold issues and remediate any existing problems. If you are concerned about window condensation or mold in your home, please contact us today for assistance. Our team of certified inspectors will help you identify the source of the issue and recommend solutions to get your home back on track.