Looks like there are already a lot of bandaids on that door and frame. Are you against a new unit? Fiberglass door and a composite jamb would solve future problems.
Plus with that much water, how is your sheathing and structure underneath? I would imagine it’s in pretty bad shape. They didn’t start putting in waterproof sils for doors until recently.
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Yes, water intrusion from various sources has been a problem with this door, from time to time. A new door would be nice, I guess, but the labor is huge. Like $3,000. And the new door itself is $1,000 to $2,000. Plus worrying whether it's installed right, and comes without any defects.
For now, seems to make sense to try to fix up existing door, and be $5,000 richer.
I am willing to spend some bucks on labor, though. I just had a handyman remove and replace the 3 rotted trim pieces with PVC. He said he thought that would stop the water getting in. He also sealed up the entire length of the space between the first deck board and the door. He also put in that new piece of custom made wood at the bottom of the center post. The bottom of that post was rotted out.
It did stop the water 90%. But it gets moist still inside the aluminum channel during rain with a wind blowing against the door.
I'm hoping the moisture is because water is seeping into the rotted wood, and then down into the channel, and preventing water from soaking into the rotted wood will cure the problem.