Damage to the door itself.
Water leaking from top of patio door.
However in some instances the top corner of the door is the true culprit.
Aim a garden water hose with a sprayer set on mist or low at the outside of the sliding door.
If a frame is crooked water can leak into the gaps between door and frame.
During irma my first floor s windows north facing about 8 on each side were leaking rainwater from the top of the window similar to the manner of leaking in the video by ada lam above.
About a month ago during heavy rain and a strong se wind i noticed a leak from our east facing upvc patio doors.
If the door was installed directly on the concrete slab water could be seeping under the doorframe.
Spray the door and look for the leak location.
When a door leaks the most common suspect is the bottom corner of the unit.
Occasionally these sliding doors leak and need to be repaired.
Some areas like your roof are obvious locations.
There are many places where water can leak into your home.
I ve got a sliding patio door on the back of my home there s a moisture problem directly under the door in the basement.
The exterior door in between the windows had water entering the wall and you can see stains around the door still.
Have a reputable sliding door contractor remove the door if it has not been damaged build a new frame and reinstall the door.
The gutters are clear and the patio is level.
Step 1 test the door for the location of the leak.
Water can seep through even the smallest cracks.
How to stop water leaks under a door frame.
If the door is installed at the edge of the roof overhang water could be leaking from the top of the sliding glass doors.
One potential problem area you can.
If you cannot re create the leak problem inspect the interior of the door for stains or.
At the time i went outside and saw that the first course of mortar above the window was cracked so assumed it was being forced in by the wind.
Whether your door is sagging or bowed or just not making proper contact with the weatherstrip to seal out air and water the upper corners of your frame could be the problem.
Moisture could be.