If the door is installed at the edge of the roof overhang water could be leaking from the top of the sliding glass doors.
Water leaking from top of patio door.
How to stop water leaks under a door frame.
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.
Some areas like your roof are obvious locations.
There are many places where water can leak into your home.
The exterior door in between the windows had water entering the wall and you can see stains around the door still.
Moisture could be.
Damage to the door itself.
Water can seep through even the smallest cracks.
I plan to seal.
If the door was installed directly on the concrete slab water could be seeping under the doorframe.
Have a reputable sliding door contractor remove the door if it has not been damaged build a new frame and reinstall the door.
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.
Spray the door and look for the leak location.
The leak was where the top of the frame meets the internal horizontal plasterwork.
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.
Step 1 test the door for the location of the leak.
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.
The gutters are clear and the patio is level.
One potential problem area you can.
If a frame is crooked water can leak into the gaps between door and frame.
About a month ago during heavy rain and a strong se wind i noticed a leak from our east facing upvc patio doors.
Occasionally these sliding doors leak and need to be repaired.