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Q: Lately I’ve noticed mold on my window sills. I wipe it away, but it always comes back. Is this a big problem? What is the best way to deal with this problem?
A: Mold can be more than a household problem: it can cause damage to a home and pose a health risk to susceptible populations and compromise a home’s air quality. The best way to deal with mold on window sills is to eliminate the damp or damp conditions causing the growth. Before tackling this problem, identify whether you are dealing with mold or mildew, as the two share similarities and should be treated differently. For mold growth, you will first need to identify the source of the problem by checking for leaks or condensation in windows. Specific cleaning products can get rid of small areas of mold growth, but larger areas may require professional help.
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Mold thrives in humid environments, so check window frames for condensation or leaks.
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If you spot mold on a window sill, it’s possible the window is leaking or condensation is building up there. Identifying leaks or condensation can help determine the next steps to take to remove the mold. A gasket that meets the glass and frame on aluminum window frames can often trap condensation, allowing mold to grow. Check the top, bottom, and sides of the window and look for cracked caulk or sealant that could be letting in excess moisture. Pay special attention to windows during or after rain, as it will be easier to identify potential leaks.
Clean the mold or call a mold expert if it covers a large area.
Mildew that grows on window sills can usually be cleaned with a household cleaner or a DIY vinegar solution. However, if the mold in question covers a large area in your home or you suspect it is black mold, it may be time to call in an expert. Once dampness and mold have spread, it can be difficult to contain them. Water mitigation and mold remediation professionals can determine the extent of the mold and suggest appropriate solutions to eradicate the problem.
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Check the roof and gutters for good drainage.
Because roofs and gutters help protect the home from water damage, it’s wise to inspect them to make sure they drain properly. Leaks in gutters and roofs can lead to mold growth as well as structural problems and damaged insulation. Leaks or other drainage issues will be evident after a storm, so it may be best to check both after heavy rain or snowfall. If you’ve done a general exterior inspection, you can also check the attic to determine if there are any leaks inside. If drainage issues are present, it is essential to address them as soon as possible, not only to eliminate mold, but to ensure the structural safety of the home.
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Reduce humidity and increase airflow, especially in damp places like the bathroom.
To reduce humidity in a space, increase airflow by using a fan or dehumidifier. These devices can help eliminate damp conditions where mold is most likely to grow. While the breeze from fans circulates the air and evaporates excess moisture, dehumidifiers extract moisture from the air. Since moisture from showers and tubs can aggravate damp conditions, mold is more likely to grow on bathroom window sills.
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Consider repairing or replacing the window to make sure the mold doesn’t return.
If a leaky window is the culprit, damaged sealant is often to blame. You can try recaulking the window yourself, but more complex repairs may require a professional. If the windows are in poor condition or you have noticed mold between the panes, it may be worth replacing the window completely. Soft wood, signs of water damage, and frequent drafts can be signs that window replacement is in the cards. Stronger window frames will insulate a home better, which means less condensation and less chance of mold. Some window frames are more resistant to moisture than others, so check with a local window manufacturer or installer to find out which one is best for your home.
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