Have you been unable to stop the water leak in your window? You might be using the wrong materials or doing something incorrectly! In this detailed guide, we explain the causes of fixed window leaking, window leaking from the top, and how to fix leaking windows for wood, PVC, and other types of windows.
Why Do Windows Leak Water?
- Worn Insulation Materials: Over time, insulation materials such as silicone, acrylic, or polyurethane caulk can degrade, causing leaks in older windows.
- Window Age: No matter the material—wood, PVC, or aluminum—windows can become deformed over time. Changes in the structure of the window caused by wear and tear lead to water seepage. For example, wood windows can crack or break, PVC windows can expand or contract due to heat or cold, and aluminum windows can bend, all of which can cause leaks.
- Damaged Seals: Seals around the window can also wear out or crack, leading to leaks.
- Improper Installation: If a new window is leaking, it may have been installed incorrectly. Gaps or misalignments during installation can allow water to seep inside.
- Clogged or Damaged Drains: Windows usually have sloped drainage systems that direct water away. If these become clogged or damaged, water can accumulate and leak into the home.
- Condensation: In rare cases, condensation within the window frame can make it appear as if the window is leaking, particularly in humid conditions.
Regardless of the cause, window leaks are fixable with the right approach and materials.
What to Do if the Fixed Window is Leaking from the Sides or Top?
First, try to determine where the water is coming from. While gaps between the window and wall are a common culprit, it’s important to check the window’s structural integrity as well. If the window is wood, repair any cracks using a suitable filler.
Next, inspect all the window seals. If they are worn or damaged, replace them. For aluminum windows, removable parts might need to be replaced.
After heavy rain, water may leak from the edges of the window or, in particular, from the top. So, what should you do in this situation?
How Do You Fix Leaking Windows?
The best way to stop water from leaking from the edges of a window is to use pure silicone caulk. Pure silicones are commonly used for window edges and other sealing tasks. They can remain intact for a long time without cracking and adhere well to the window.
Tip: Some silicones may contain solvents. During production, solvents can be added to reduce cost, but these silicones crack and separate over time, leading to poor window insulation. To ensure long-lasting results, always purchase high-quality, 100% pure, solvent-free silicone.
Another effective method for sealing leaks is using polyurethane caulk. High-quality polyurethane caulks can last for years. But when should you use silicone and when should you use polyurethane caulk for window insulation?
Check your window both inside and outside to understand where the water is entering. If the water is coming from the gap between the window and the wall, use polyurethane caulk. If the water is coming from the bottom of the glass, silicone is the best material for sealing this area.
Other Tips
Pure silicone and polyurethane caulk are the best materials for sealing water leaks around window edges. However, these materials must be of high quality. Silicone should be 100% pure, and the caulk must be polyurethane-based. Polyurethane caulk is waterproof, more adhesive, and more flexible than standard caulks, making it one of the most suitable materials for window insulation.
When repairing window leaks with these insulation materials, make sure the window is dry. Proper application is as important as the quality of the silicone. If applied correctly, the leak should not return for a long time.
Frequently Asked Questions
What is a Window Leak?
Window leakage is the dripping or seepage of water from various areas of the window due to the deterioration of its structural integrity, the deformation of the seals, and the creation of gaps between the window and the wall.
How to Find Window Leaks?
Rain will give you a clue in finding window leaks. However, if you live in a detached house, applying water to the window from the outside might help. This will show you the location of the leaks. If you suspect a water leak from the window, we recommend insulating the entire window, not just specific areas.
How to Stop Leaky Windows?
If there is structural damage to the window, repair it. However, if the window is too old to be repaired, it may need to be replaced. Before replacing the window, you can try using effective water insulation materials such as silicone and polyurethane caulk.
Why is Water Dripping from the Top of My Window?
It is likely that the insulation materials around the window have deteriorated or the window’s structural integrity has been compromised. After the window dries, if the water leakage is from the glass, apply silicone; if it’s between the window and the wall, apply polyurethane caulk.
Is it Normal for Windows to Leak in Heavy Rain?
No, a window should prevent both water and air from entering under all conditions. Therefore, the window needs to be checked and any missing insulation should be added.
How to Fix a Leaky Window Without Replacing it?
If the window is wood, fill the gaps and cracks on the window with a filler. Apply at least two coats of varnish wood protector on the window. “Related post: How to paint window trim.” Apply polyurethane caulk to the gap between the window and the wall. If the window is PVC or aluminum, use epoxy putty to seal holes and cracks. Fill any gaps between the window and the wall with polyurethane caulk.
