There is a second floor balcony on my house. The balcony door is above a porch door. The porch door frame was showing signs of water damage. We took the door down, removed the frame and found a lot of water damaged wood. We are trying to find out how water got inside the wall. https://imgur.com/gallery/HAVtHLA is the corner of the base of the sliding door. Is this gap funneling water into my wall? (I don’t know how sliding doors are assembled – maybe they are designed to drain water to the exterior?).
If this is the problem so I resolve by caulking? Then finish repairing the damaged wall below?