The gutters are clear and the patio is level.
Patio door leaking at top.
We ve tried everything much like eric above including getting the balcony refelted and new patio tiles put on we ve also put a lip around the balcony.
It just comes in in one corner.
If a frame is crooked water can leak into the gaps between door and frame.
I plan to seal.
A sliding glass door is no better than the frame into which it is placed.
Aim a garden water hose with a sprayer set on mist or low at the outside of the sliding door.
If you cannot re create the leak problem inspect the interior of the door for stains or rust.
Door bottoms seal between the panel and door sill so watch for signs when your door bottom needs replacing.
Water leaking through patio door.
It may seem obvious but a door left open or one that cannot be closed tightly because of wear and tear is a significant problem during a storm.
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.
Causes of door leaks there are many potential pathways for water to leak in through a door but the biggest opening is of course the doorway itself.
Damage to the door itself.
Door bottoms are important but leaks can also be caused by the door sill.
Have a reputable sliding door contractor remove the door if it has not been damaged build a new frame and reinstall the door.
Spray the door and look for the leak location.