When you notice signs of mold growth, it can be a frustrating situation especially if it has led to rotten wood. In fact, moisture damage are more common than you think, primarily due to poor window installation.

To address moisture damage in your window sills, the first step is to locate the cause of the issue. Check your window's caulk to see if it's in good condition and functioning properly. If the caulk is in need of replacement, replace it as soon as possible. On the other hand, if the window frame is not properly sealed, reapply caulk to seal any cracks.

Once you've located and fixed the source of mold growth, you'll need to address the damage itself. This may involve repairing the warped wood if it's extensive. You may also need to scrape down the wood to smooth out any uneven surfaces and apply a waterproof sealant to prevent future damage.

However, if the damage is small, you can opt for a easier solution. Remove any dirt from the window sill, and then use a solution of equal parts water and white vinegar to scrub the area. Let the solution sit for a some time before rubbing it down with a soft-bristled brush. Dry the area completely with a clean towel and apply a moisture-resistant coating to shield the surface.

In addition to fixing the individual mold issue, you'll also want to take measures to avoid future mold growth problems. This can be achieved by ensuring efficient ventilation in the area, using a dehumidifier if necessary, and using a waterproof finish or coating on your window sills.

It's also crucial to note that early intervention is better than cure when it comes to mold growth. Regular inspection and maintenance of your windows, including lubricating and cleaning the hinges and replacing deteriorated parts, can go a significant way in avoiding moisture damage.

Ultimately, fixing mold damage in your wooden window sill replacement sills calls for perseverance and the right techniques. By locating the cause of the issue, addressing the mold removal, and taking measures to prevent future damage, you can restore your window sills to their original condition and prevent future issues.