Window leaks can result from a structural failing elsewhere in the home such as an opening in the roof upper floors or siding.
Roof leaking bottom window.
The problem is often with the window itself instead of anything that you might be able to do to prevent water from coming in.
Unfortunately this may not be the case for water leaking from the bottom.
You can try some simple maintenance work such as.
Make sure the sill at the bottom of the window frame is pitched.
Have a roofing expert conduct an inspection of your roof system.
Unlike water leaks that can be resolved with a quick coat of caulking a window leak from the bottom is typically a sign of a much bigger issue.
If a leak is difficult to find enlist a helper and go up on the roof with a garden hose.
Re seal the glass to the gasket with clear silicone caulk.
Dig out any cracked or dry caulking that isn t properly sealing adjoining surfaces and replace with silicone caulk.
For example soak the downhill side of a chimney first then each side then the top on both sides.
Missing shingles or a failing roof system might be your culprit.
Check the gasket between the window frame and the glass.
Recaulk the corner flashing if any areas have hardened caulk.
Remove damaged exterior caulking clean the window frame and recaulk.
Start low soaking the area just above where the leak appears in the house.
If you notice water stains on the wall above the window or along the top or bottom of the frame this usually means there is a leak inside the walls.