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How to Address Leaking Windows

Troubleshooting leaky windows is easy if you know what you’re looking for. The sooner you identify the source of the leaks, the sooner you can call for repairs. In this blog, home improvement company Renewal by Andersen® of Kansas City shares how to troubleshoot leaky windows.


Types of Window Leaks

Once you notice a leak, try to find out where the water is coming from. Identifying the source will help determine whether the windows will require repairs, or if it’s something else. The following are some of the most common types of window leaks.

  1. Moisture on the Glass — If you notice droplets on the interior-facing side of your windows, good news: there is nothing wrong with your windows. In fact, condensation on the glass is indicative of functional window seals. However, condensation also indicates high indoor humidity levels, therefore, you will need to focus on controlling relative indoor humidity.

  2. Water Leaking from All Sides — If rain is falling on the windows directly, this means there could be gaps between wall and window frame, which could be caused by installation errors or warped frames. If water is coming through the same areas even if the rain isn’t hitting the windows, you may be looking at a roofing leak.

  3. Water at the Bottom of the Frame — This is caused by an improper fit between sashes and frames, either because of misaligned hardware, or due to warped frames. The same windows may also be difficult to open and close.

How to Fix Window Leaks

The following are corresponding solutions to the types of window leaks described above.

  1. Control Indoor Humidity — You can avoid window condensation by controlling relative indoor humidity. Air conditioning systems naturally dehumidify indoor spaces, and changing its settings can help balance relative indoor humidity. Failing this, integrating a humidifier/dehumidifier system into your HVAC system may be your best option.

  2. Reapply Caulking — The transition between wall and frame may require new caulking. Be careful when scraping off old caulk, as the window finish may get damaged. If this is your first time applying caulk, practice getting a good, consistent bead before applying them to windows. If the leaks appear to be coming from the roof, consult a roofing professional.

  3. Replace Weatherstripping — Old and worn rubber weatherstripping can be easily replaced. Make sure the installation area is clean before installing new ones. If your windows have metal weatherstripping, consult a window professional.

Renewal by Andersen of Kansas City is your leading provider of replacement windows and patio doors. Give us a call at (913) 385-1300 or fill out our contact form. We serve customers in Kansas City and nearby areas.

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