Prevent Weather Damage to Your Window Sill

  • 2-4 hours
  • Beginner
  • 35-50
What You'll Need
All-purpose cleaner
Scrub brush
Bleach (optional)

Water and mold damage are common enemies to your window sill. With proper maintenance and cleaning, you can keep your window sill looking new, and you won’t have to replace it for some time.

Cleaning Current Window Sill Damage

There are a number of solutions that people recommend for use for cleaning mold from window sills. If you only have a little bit of mold, or the mold is just starting to form, an all-purpose cleaner and water or soap and water solution might work with a scrub brush. If the mold is a bit more intense, a water and bleach solution is recommended.

Make sure if you use any cleaner mixed with water, you apply it only to the brush or use a spray bottle to apply the solution to the window sill. You don’t want to pour the solution on the window sill directly, because mold thrives on moisture, so the less moisture used to clean the mold, the more likely you’ll stop it from growing. Rely on the brush to do most of the cleaning work rather than the actual solution.

Preventing Mold and Moisture Damage in Winter Months

Mold damage to your window sill is caused by sitting moisture. If you have water that gathers in your window sill on a regular basis, it’s important to clean your window sills when you notice moisture gathering. Another way to keep mold from forming on your window sill is to use a dehumidifier. This will reduce the humidity of your home or apartment and keep moisture from forming.

Most mold forms in the winter and colder months, because people keep their windows closed and moisture condenses more in colder conditions. It’s important to close your storm windows in winter months to keep any snow, ice or rain from collecting. You should also keep blinds or curtains open when you can to allow more air to get to your window sills.

When the weather begins to get colder, you can apply a sealant to the trim and window sill of the windows in your home to ensure that moisture will not damage the wood. If you have a metal window sill, the same rules apply, because instead of mold, you could experience rust damage.

Preventing Damage in Summer Months

In the spring and summer months, open your windows when the weather permits to keep moisture from gathering on the window sill. If you have an air conditioner that sits in a window, it might be necessary to manually remove moisture from time to time. Make sure to inspect your air conditioner to make sure it doesn’t have any leaks that will gather moisture on your window sill.

If your window sill is too damaged, you’ll need to replace it. If you can’t clean the rust or mold off the window sill surface, it might be time to replace the window sill and use the prevention methods mentioned to keep a new window sill from weather damage.