Replacement Windows Only $45/mo
RATED BY
Leaking Windows During Heavy Rain: What To Look Out For
Feb 25, 2022
7 min read
45
by Matan Korin
When you hear that there’s rain in the forecast, do you excitedly anticipate a relaxing day indoors as a gentle shower traces a path down the outside of your windows? Or, do you start to round up the buckets and towels to mop up the water that will inevitably leak inside?
No matter the season, leaking windows and patio doors can pose major problems including structural and aesthetic damage as well as increased heating and cooling bills. It’s important to address water leaks when you first notice an issue. By taking the time to investigate the situation now, you’ll reduce the risk of costly repairs later.
Why are my windows leaking?
Window leaks are common in ageing homes. After years of extreme temperatures, varying weather conditions and building settling, windows are no longer air- or water-tight. Window frames can become damaged, glazing seals broken or the entire unit can become out of square (leaving gaps where water can seep in.)
While older windows often experience water leaks, newer ones can also be at risk. Generally, there are three key areas that cause windows to leak: house design, installation and maintenance.
House Design:
- Lack of overhangs to drain water off the roof and protect wind-driven rainwater from entering through the windows.
- Improperly angled fascia board above the window. It should be angled outward to direct water away from the unit.
Installation:
- Poorly installed windows or breaks in the flashing will allow water infiltration.
- Using building paper or house wrap instead of specially designed window flashing will allow water to seep behind the paper and into the wall area around the windows.
Maintenance:
- Broken or missing caulking at the window flange and at seams.
- Cracked glazing putty—the glass seal will be broken and allow for moisture and condensation to get between double-glazed windows.
- No paint seal—paint should slightly overlap from the window molding to the glass to create a tight seal.
Certified Master Home Inspector
at Timber Pointe Home Inspection
Verified by Inspector
Ian Lauzon is an independent inspector overseeing every installation step to minimize errors, ensuring a smooth and worry-free experience.
How can I fix window leaks?
In reality there as many fixes as there are causes for leaks in windows. It could be something as simple as replacing weatherstripping on a slider window, or as complicated as having to rebuild half of your rotten wood wall before even commencing a window replacement.
You can try some simple maintenance work such as:
- Remove damaged exterior caulking, clean the window frame and recaulk.
- Check the gasket between the window frame and the glass. Re-seal the glass to the gasket with clear silicone caulk.
- Make sure the sill at the bottom of the window frame is pitched downward to drain water toward the exterior.
- Clean dirt, debris and insects from weep holes in the frame bottom. Use a small wire to unplug these holes. This will allow any water that comes in through the screen to drain to the outside.
If your window is leaking beyond the actual unit and is affecting or has affected the structure around the window, the only proper solution is to call in an experienced window replacement professional for an evaluation and possibly a full-frame window replacement.
Real Windows. Real Results.
See how we’ve solved window problems just like yours — for real Canadian homes.
How to Stop Window Leaks — For Good 🔥
Even the best windows need a little maintenance to stay leak-free. Over the years, we've seen the same small issues turn into costly repairs simply because homeowners didn't know what to look for. Here's what actually works to prevent window leaks:
1. Check Your Caulking
Look around the outside of your window. If the caulking looks cracked, loose, or missing — water will find its way in. Scrape it off and reapply exterior-grade caulking for a tight seal.
2. Keep Drainage Channels Clean
If you have slider or hung windows, clear out dirt, leaves, or debris from the bottom track. Blocked drains mean standing water — and standing water means leaks.
3. Look Beyond the Window
Not all leaks start at the window. Water from damaged roofs, loose siding, or gaps around chimneys can travel down and show up around your window frame. Check your roof, siding, and seals regularly.
Still Leaking?💧Time to Call a Pro
If leaks keep coming back — it's not just about caulking anymore. A proper inspection by reliable window pros will show whether your windows need repair or full replacement.
💡 Tip from experience: Always ask why the leak is happening — not just how to cover it up. A trustworthy window expert will explain the root cause and best fix, not just patch the symptom.
Windows & Doors Replacement & Installation by Ecoline
