The short answer
Common Causes
A window leaks when water gets past the barrier meant to keep it out. The most frequent culprit is worn or cracked caulk around the frame. Over time, sun and temperature swings break down that seal, letting rain drive in.
Another common cause is missing or damaged flashing, the metal or rubber strip that directs water away from the joint between the window and the wall. If flashing pulls loose, water finds the gap. Clogged weep holes, the small openings at the bottom of the frame, can also trap water inside.
In humid climates, spring hail and thunderstorms can damage window seals or frames, making leaks more likely after storms.
- Cracked or missing caulk
- Damaged or missing flashing
- Clogged weep holes
- Worn weatherstripping
- Improperly installed window
- Condensation on glass
Check the Frame First
Start by inspecting the window from inside. Look for water stains on the wall below the sill or on the frame itself. Wet drywall that feels soft or crumbles is a sign of prolonged moisture. Also check the glass for condensation, which can mimic a leak.
From outside, examine the caulk lines and the flashing. If you see gaps, cracks, or material pulling away, that is a likely entry point. Also check the weep holes; clear any dirt or debris with a small wire or pipe cleaner.
After severe weather, inspect the window frame for dents or cracks, as hail can compromise the seal.
Look at the Roof and Walls
Sometimes what looks like a window leak is actually water coming from elsewhere. A roof leak can travel along rafters and drip down inside the wall, appearing at the window. Check the ceiling above the window for stains or peeling paint.
Similarly, a leak in the wall cavity, from a pipe or the roof, can exit at the window opening. If the leak is persistent and the window itself looks sound, the problem may lie higher up. A water damage inspection can help pinpoint the true source.
In Rowlett's humid subtropical climate, spring hail and thunderstorms can damage roofs and walls, so a thorough check is wise.
Fix or Replace the Window
Minor gaps in caulk can be resealed with exterior-grade caulk. Clean the area first, let it dry, then apply a new bead. For damaged flashing or a frame that no longer seals, a window replacement may be needed.
If the leak is from the roof or wall, the window itself is not the problem. In that case, roof leak repair or pipe leak detection may be the right step. A professional can determine the right course based on the actual leak source.
The cost of repairs depends on the extent of damage and the materials involved.
When to Call the Pros
If you cannot find the source, or if the leak causes water damage inside your home, call local water damage pros. They can trace the water path, dry out the structure, and prevent mold growth. Acting quickly helps reduce the risk of secondary damage.
The pros use moisture meters and other tools to locate hidden moisture. They can also dry out walls and subflooring if water has soaked in. For a window that needs replacement, a window installer is the right choice.
Policies vary, and your insurer decides what is covered.
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Call Now (214) 730-5993Frequently asked questions
Can I fix a window leak myself?
You can reseal minor gaps with caulk, but if flashing is damaged or the leak persists, call a professional. A water damage pro can find the source and prevent further damage.
Why does my window leak only during heavy rain?
Heavy rain can overwhelm the window's drainage system. Clogged weep holes or a poor seal may not handle the volume. Check for blockages and inspect the seal after a storm.
Is a window leak covered by insurance?
Coverage depends on your policy and the cause. Sudden storm damage may be covered, while wear and tear usually is not. Check your policy and ask your insurer about your specific situation.