[bassnjulia]

Sliding padio door leaking at the bottom , water leaking on flooor beneath carpet into wood floor then into ceiling of living room below it causing damage to ceiling .

[twinkiedooter]

You need to properly seal the outside of the bottom of the patio door from the outside. Use a good quality silicone sealer at the proper temperature outside and let it properly cure before it rains. I would seal the entire door frame on the outside as well just in case the leak is coming from the top or side of the door.

[hkstroud]

Remove door panels from frame. Remove bottom track. That may or may not require removing the side jams. Clean surface under bottom track and put a bed of either Liquid Nails or silicone. Reinstall bottom track.

Just sealing the outside or the track edge may work for a while but chances are the seal will break or crack in the future and the problem will come back.

[cyberheater]

I see this too when there is not proper flashing at the outside, under the door. Do the suggestions above, and in the summer - check to see if you have flashing.