Older homes have character that modern builds often struggle to replicate, and much of that charm comes from original wood windows. However, with that character comes a specific set of maintenance requirements. If you still have wood windows, staying on top of a few key details can prevent costly rot and water damage down the road.

Our latest video features our inspector, Tim, who walks through some of the most common “hidden” maintenance items homeowners often overlook during a standard cleaning:

1. The Role of Window Glazing

Many homeowners mistake window glazing for simple caulk or trim. Glazing is actually a specialized, putty-like substance that creates a weather-tight seal between the glass pane and the wood sash. Over time, constant exposure to the sun’s UV rays and seasonal temperature fluctuations causes this compound to lose its oils and elasticity. Consequently, you will notice it starting to crack, chip, or flake away.

When glazing fails, it creates a hairline gap that allows moisture to seep directly into the wood sash. This trapped moisture leads to wood rot, which can eventually require a full window replacement—a much more expensive endeavor than simply touching up the glazing. If the glazing looks like dried-out Play-Doh or is brittle to the touch, it is time for a repair. Keeping this seal intact is your first line of defense for window longevity.

2. Window Water Management

If you have storm windows installed over your wood windows, you may notice small gaps or slots at the very bottom of the metal frame. These are known as weep holes. These holes provide water, trapped behind the storm window, a clear path to drain.

A common mistake occurs when homeowners accidentally plug these holes shut with caulk. Additionally, debris can build up and clog them as well. If water cannot drain out, it sits against the wooden sill. Since wood is highly porous, it will soak up that standing water like a sponge. This leads to window sill rot that can eventually spread into the structural framing and wall cavity of your home, turning a minor maintenance task into a major repair.

3. The Importance of a Clean Windowsill

While it is easy to focus on cleaning the glass for clarity, the windowsill often collects a buildup of dirt and dead insects. The windowsill is the flat bottom portion of a window frame. Buildup is more than just an eyesore; organic material holds onto moisture for extended periods. Therefore, a dirty sill stays damp much longer than a clean one, creating the perfect environment for mold and decay. During your spring and fall cleaning, you should thoroughly wipe down the sills to ensure the path to the weep holes is completely clear of obstructions to ensure the wood can dry out properly.

4. Water Staining on Wood Windows

In addition to checking the glazing and sills, homeowners should keep a close eye out for dark discolorations or “tide lines” on the interior wood surfaces. Water staining is often the first warning sign that your window’s moisture protection has failed. Especially in the winter months, condensation can build up on the glass. This will cause the finish on the wood to begin to deteriorate. Prolonged exposure to moisture can lead to rot and other issues. Repainting or restaining the interior wood can help protect against damage.

Taking care of your wood windows doesn’t have to be a huge project if you catch the small stuff early. It’s a lot cheaper to do a little work today than it is to replace a whole window later.

If you’re thinking about putting your house on the market soon, these are exactly the kind of things a home inspector is going to look at. Buyers want to see that a home has been well-maintained, so completing some of these window items now can help your home inspection go a lot smoother when it’s time to sell.