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Patio door leaking at bottom.
Moisture could be seeping into your home from the top.
Sometimes water intrusion is severe staining carpets and causing dryrot at the subfloor baseboards and sometimes even the wall.
When a door leaks the most common suspect is the bottom corner of the unit.
Aim a garden water hose with a sprayer set on mist or low at the outside of the sliding door.
Check to see which door moves and which one is the stationary.
You can do this by taking steps to make the bottom of the door frame waterproof before you install the door.
6 rain hitting threshold and running down door face is splashing seeping under door on top of the threshold.
I plan to seal.
Solution is a tight bottom sweep doorseal and a rain splashguard or dripcap on the bottom outer face of door like the following link the type i use unless a fancy appearing one is desired easy to diy on most doors.
If you cannot re create the leak problem inspect the interior of the door for stains or rust.
Spray the door and look for the leak location.
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.
Water leakage is a common problem with sliding door thresholds.
1 place the end of a strip of adhesive backed aluminum tape on one of the side jambs in.
The gutters are clear and the patio is level.
Test the door for the location of the leak.
If you have a problem with water leaking it will usually be on the bottom track threshold of the non stationary door.