What is Black Mold?

Black mold, scientifically known as Stachybotrys chartarum, is a type of microfungus that thrives in damp, warm environments. It is especially concerning due to its potential health risks. Black mold is particularly problematic on windows, where it can feed on organic materials in the frames and seals. If you notice black mold growth on your windows or elsewhere in your home, it is crucial to take immediate action.

What Causes Black Mold On Windows?

Mold on windows is primarily caused by moisture on the window sills. Any window with excess moisture, even without visible signs of leakage, can lead to mold growth on the sill. Condensation is another common cause, particularly on old single-glazed windows that are not adequately sealed to prevent moisture accumulation.

Condensation: one of the most common causes of mold on windows is condensation. This happens when moist, warm air inside your home meets the cold surface of the window glass. To prevent condensation, ensure good air circulation, use dehumidifiers, and maintain consistent room temperatures.

High Humidity Levels: elevated humidity levels in your home can lead to moisture accumulation on cooler surfaces like window panes. To combat this, use exhaust fans in high-moisture areas and consider using a whole-house dehumidifier.

Leaking Windows: improperly sealed windows can allow moisture to accumulate, especially during wet weather, leading to mold growth. Regularly check your window seals and consider professional replacement if your windows leak. Installing new replacement windows can improve sealing and protection, helping to prevent mold growth.

Poor Ventilation: limited ventilation can trap moist air inside, encouraging mold growth. Increase ventilation by opening windows when weather permits, using exhaust fans, and considering air exchange systems.

How To Remove Black Mold?

While windows are designed to keep moisture out of your house, condensation and air infiltration can still lead to moldy window casings. It’s crucial to wear protective gear to prevent spores from contacting your skin or entering your lungs. Before you start, make sure you have protective coveralls or long pants and a long-sleeved shirt, gloves, disposable hair and shoe covers, safety goggles, and a mold safety face mask. Also, keep children and pets away from the work area. To remove mildew from window seals, scrub them with a window cleaning solution, then rinse thoroughly. You might need to scrub for a while to fully eliminate the mold. To prevent future mold growth, wipe down the seams with window cleaner after cleaning. Regularly clean your windows and replace the sealant as needed to prevent black mold from developing.

How To Prevent Mold On Windows?

The three main steps to address this issue are to improve home ventilation, upgrade insulation levels (including implementing draught-proofing methods for windows), and reduce moisture levels in the room.

Ventilation: the simplest and most cost-effective way to improve room ventilation is to open the windows for about 10-15 minutes every day. In bathrooms and kitchens, it’s crucial to have a good extractor fan installed.

Insulation: one of the best investments you can make in your home is high-quality insulation. This can include cavity wall, internal, or external wall solutions, but don’t overlook simple draught-proofing measures as well.

Moisture Reduction: dehumidifiers help reduce moisture in the air and regulate humidity levels, both of which can combat window condensation. Additionally, avoid drying laundry indoors or in poorly ventilated spaces.