I do not know who installed it.
Sliding glass door leaking into basement.
1 leakage from poor failed caulk and or flashing over or around the door leaking down to the bottom of the door and then out onto the floor 2 poor seals on the door itself.
Test the door for the location of the leak.
I ve checked them and they drain properly.
There is a deck outside above the door and a sliding glass door upstairs directly above the leak.
Water is leaking in periodic drops at the bottom part of the trim which faces the ground above the door.
The track where the screen sits has weep holes.
The best way to stop the leaks is to prevent them from occurring in the first place.
The door is a retrofit from a previous owner.
In the case of your door water can get behind the.
It looks like the previous owners had the same problem because there is some damage to the floor there.
Gravity pulls the water over each shingle piece of siding or feather and the water never can get into the core of the building or bird.
If you cannot re create the leak problem inspect the interior of the door for stains or rust.
If a frame is crooked water can leak into the gaps between door and frame.
Have a reputable sliding door contractor remove the door if it has not been damaged build a new frame and reinstall the door.
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.
Look around your walk out basement door to identify where the water is entering.
Spray the door and look for the leak location.
One potential problem area you can overlook is underneath an exterior door.
First time having a house with a sliding glass door and i m getting water inside.