Are your windows leaking water? Telltale signs of moisture damage from snowy weather become prominent on old wood windows. One of the first steps to take is inspecting old windows for moisture damage, especially if your New England home has wood window frames. If the window becomes damaged, you might find yourself saying, “My windows are leaking water!”
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In this blog, we will show you the signs that your windows are leaking water, along with the proper steps to stop window leaks.
Watch for Water Damage on Windows
Your windows have a big job—they reduce your energy bills while keeping your home dry. But harsh weather conditions such as snow, ice, and rain can wear down your windows over time, both in terms of aesthetics and performance.
These are the most common signs of moisture damage in windows:
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- Check for discoloration around the windows and on the frames. You might find water spots and stains in the home that are brown, yellow, or copper in color.
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- Cracks, bubbles, and peeling paint are all symptoms of potential window leaks.
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- Changes in the texture of wood may also indicate window leaks. As an example, wood window frames may buck when they become detached from the siding. As well as sagging window frames, wood window frames may feel spongy from moisture damage.
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- Mold and mildew can grow both inside and outside of walls under the right conditions.
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- With severe moisture damage, you can poke a wood window frame with a screwdriver and it will sink right through the frame.
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- The window has foggy glass that won’t wipe away.
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- You feel a draft around your windows.
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- You’re experiencing high energy bills.
Why Do Windows Leak Water?
If your windows are leaking water, you might wonder why this problem is happening in the first place. Windows leak water for several reasons and they depend on where the leak is coming from.
The Water is Coming from Around the Window
Depending on where the leak is located, the water can seep in from the top, sides, or bottom of the window. This happens when the sealant or caulk around the window becomes old and cracked, allowing rain to enter the house.
The telltale sign of degraded sealant is condensation found around the edge of the window when it rains. You can also look for discoloration or abrasions on the sealant itself. Replacing the old caulking with new caulk is a simple fix.
However, if the windows are old and underperforming, caulk is a band-aid resolution, and it’s only a matter of time until the caulk fails again.
The Water is Leaking from the Top
Top-of-the-window leaks can indicate installation mistakes. It could be that the flashing was improperly installed, or it may not exist at all. A poorly installed house wrap could also lead to leaking windows.
But improper installation isn’t just about flashing or house wrap—other culprits include poorly fitted windows or builders using non–corrosion-resistant nails, which create gaps or weak points over time. Sometimes, even if worn sealant or hardware doesn’t seem to cause your window leak, installation mistakes often explain the problem.
Unfortunately, you can’t exactly fix this type of window leak by applying caulk. The house wrap and flashing tape around and above the window may be removed. In addition to keeping water flowing away from the siding, house wrap also acts as a moisture barrier.
Ultimately, if poor installation is the root cause, you may be looking at more extensive repairs or even replacing the window to ensure a lasting solution.
The Window Leaks from the Bottom
When customers call us asking for help with leaky windows, the leak could also be coming from the bottom of the window.
Windows with metal or vinyl frames usually have drain holes near their bottom edges. These holes allow water to escape but can become clogged with debris. Using a wire coat hanger, you can clean out the holes.
Water leaks between the sill pan and the window sill are more likely to occur near the bottom where the sill slopes. The sill of every window should slope away from the window so that water can drain to the exterior of the house. The window may need to be reinstalled if either of these is incorrect or missing.
Spotting and Preventing Window Leaks
Even the smallest gaps around window frames can cause costly issues if left unchecked:
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Early detection is key. Catching leaks early—especially in New England—prevents costly repairs and discomfort later.
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Moisture around window frames can cause:
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Drafty rooms and reduced comfort
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Water damage to drywall
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Rotting or decaying window sills
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Mold and mildew growth that’s difficult to remove
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Proper sealing helps:
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Stop moisture intrusion before it spreads
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Protect against structural and indoor air quality issues
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Avoid surprise repair costs and high heating bills
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Water Damage by Window Material
Different window materials respond to moisture in very different ways:
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Wood windows are the most vulnerable to moisture-related damage.
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Easily affected by rot, mold, and mildew
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Signs of damage include peeling paint and decaying frames
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Regular maintenance is essential to prevent deterioration
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Vinyl replacement windows provide superior protection.
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Naturally resistant to moisture damage
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Built with weep holes that direct water away from the frame
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The Role of Weep Holes
Built-in drainage features play a major part in keeping vinyl windows dry and efficient:
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Drain accumulated water from inside the window frame
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Prevent unwanted airflow into your home
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Include small flaps that block wind from entering
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Designed with offset interior and exterior holes to reduce direct air passage
Why Leak-Free Windows Matter in New England
Moisture might seem minor at first, but even a small leak can create big problems over time. Addressing window leaks early helps protect your comfort, preserve your home’s structure, and prevent unnecessary expenses down the road.
What Other Home Issues Can Be Mistaken for a Leaking Window?
Before you blame your windows, it’s worth considering a few usual suspects around the house that love to masquerade as window leaks. Sometimes, what looks like a rogue draft or puddle is actually the handiwork of other home issues.
Some common culprits include:
- Missing or damaged shingles: If your roof has seen better days, water can sneak in through gaps and show up near your windows, making it seem like they’re the enemy.
- Cracks in walls or siding: Small cracks—especially around window frames or in exterior siding—can channel water inward.
- Clogged gutters and downspouts: When gutters overflow (thank you, autumn leaves), water can back up and seep along walls, often ending up near window sills.
- Faulty flashing: Improper or aging flashing around roofs or chimneys can redirect water to interior walls or windows.
It’s always wise to rule out these possibilities before diving headfirst into window repairs. Sometimes, a simple fix elsewhere can save you the hassle and expense of replacing a window that isn’t the real culprit.
How to Detect Moisture Damage in Windows
If you suspect that your windows are leaking water, you might be unsure about what to look for in terms of moisture damage. Moisture damage can be obvious, but other times the signs are inconspicuous and go unnoticed.
These are the most common signs of moisture damage in windows:
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- Check for discoloration around the windows and on the frames. You might find water spots and stains in the home that are brown, yellow, or copper in color.
-
- Cracks, bubbles, and peeling paint are all symptoms of potential window leaks.
-
- Changes in the texture of wood may also indicate window leaks. As an example, wood window frames may buck when they become detached from the siding. As well as sagging window frames, wood window frames may feel spongy from moisture damage.
-
- Mold and mildew can grow both inside and outside of walls under the right conditions.
-
- With severe moisture damage, you can poke a wood window frame with a screwdriver and it will sink right through the frame.
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- The window has foggy glass that won’t wipe away.
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- You feel a draft around your windows.
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- You’re experiencing high energy bills.
Using a Hose to Pinpoint Window Leaks
A quick way to find the exact source of a window leak is with a simple water test. Ask a helper to assist, grab a garden hose, and spray water gently along the edges of your closed window. Begin at the bottom and slowly work your way up. Inside the house, watch closely for any signs of moisture, like water spots, drips, or damp patches. This step-by-step method helps you pinpoint where water enters so you know which areas need repair.
How to Prevent Your Windows from Leaking Water
Leaks around windows are a common problem in homes, but it doesn’t have to be that way. Taking the right steps to prevent your windows from leaking water can save you time and money in the future. The most common causes of windows leaking water are worn weatherstripping, cracks in the window frame, or a combination of both. Here are some tips to help you keep your windows from leaking water:
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- Check the weatherstripping around your windows regularly. If you notice any wear or tear, replace it immediately. This will help seal off any gaps around your window, preventing water from entering. It’s also a good idea to check the caulking around your windows for any cracks or gaps. If you find any, add additional caulking to close the gaps and prevent water from entering.
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- Inspect your window frames for any cracks or damage. If you find any, seal them off with a waterproof sealant. This will help keep water out and prevent further damage to your window frames. If the damage is severe, you may need to replace the window frame altogether.
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- If your windows are not sealed properly, air can leak through and cause condensation. To prevent this, make sure all windows are properly sealed and insulated. This will help reduce the amount of moisture in your home and keep your windows from leaking water.
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- Make sure your windows are properly maintained. Clean the glass regularly to prevent dirt and debris from blocking the drainage holes. Also, inspect the window frames periodically for any signs of damage or wear and tear. Taking these steps will help keep your windows from leaking water.
Keep in mind that new vinyl windows can help improve home performance while preventing leaks. By following these tips, you can help keep your windows from leaking water and protect your home from costly repairs in the future.
Frequently Asked Questions About Windows Leaking Water
How Can You Avoid Window Installation Problems?
The key to avoiding window installation headaches is to make sure your windows are installed by someone with experience. Window installation is a job best left to skilled professionals—attempting it yourself or cutting corners can lead to costly mistakes, leaks, and poor performance down the road.
Ask for references, check reviews from trusted sources like the Better Business Bureau or Angie’s List, and seek out installers who are certified or follow industry best practices. Proper installation not only prevents water leaks but also ensures your new windows work efficiently and last a long time.
Can Damaged Window Hardware Cause Leaks?
Yes, damaged window hardware—like a faulty latch or handle—can absolutely contribute to leaks. When a window doesn’t close and seal tightly, rainwater can sneak through even the smallest gaps, finding its way inside your home. The good news? Most hardware components are pretty affordable and simple to replace. By swapping out worn hinges, locks, or cranks, you can restore your window’s tight seal and keep unwanted moisture where it belongs: outside.
What to do if Your Windows are Leaking Water
If you suspect your home’s windows are leaking water, you’ll need to call in a window company to assess the situation. Leaky windows often call for a replacement, and you’ll want to choose moisture-proof vinyl replacement windows that are not prone to mold growth and other types of moisture damage.
While there are temporary fixes, the most comprehensive and reliable way to address a leaking window is to replace it completely. When installed by an experienced professional, quality windows not only protect your home from moisture and water intrusion but can also help lower your heating and cooling bills. Investing in proper installation and high-performance materials means you’re safeguarding your home’s comfort, efficiency, and structure for years to come.
Contact us today for a quote on a high-performance replacement and window contractor who provides professional installation!
