If you’ve anchored your door threshold and are still experiencing leaks, this is a problem The best way to fix your leak problem is to weatherproof your door. To stop water leaks through the bottom of your door threshold, apply caulking to the area For about $10, you can easily purchase a transparent caulk sealant online. Many different types of patio door frames that leak water at the bottom corner should be siliconed over top of the foam pad gasket at the frame corner to ensure water cannot get past this. Not much point in a temporary fix if you are replacing the door
The problem is likely a lack of deck ledger flashing And it might be missing on the entire ledger, not just under the door Or maybe it has a ledger flashing but it isn't sealed to the rough opening under the door. To repair water damage under a patio door, one should identify the water source, thoroughly dry the area, treat any mold, and repair or replace damaged materials
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