We have a slider patio door from Lincoln. The fixed panel is getting black stains on the bottom rail around where the rollers would normally be. There is also a small amount of dry rot on the bottom where the two doors meet. I had a Lincoln dealer out and all he could say is that water was getting in somewhere, but couldn't offer any help. He said the rail can't be replaced either.
Per the photo, there is ice on the deck, but I didn't chip any away so it shows it doesn't go all the way to the wall, at least an ice dam isn't built up against the door. The bottom of the fixed door is shown with the snow removed. The bottom of the whole unit does overhang the siding, and it looks well caulked.It looks like the decking may be about 2" below the door, which would put the ledger itself about 3" below the door. I do remember that ledger has flashing but can't see it with the ice, but I think it was flashed from under the siding, over the ledger and then it was just wrapped over the top of the ledger.
Any suggestions as to how water might be getting to the door? Is it mismounted, would remounting it help? Can the bottom rail be replaced?
I don't think you can replace the bottom rail. Just guessing, but the bottom rails / tracks usually have just a couple of cut-out places for drainage. Ice and/or dirt can clog those up, causing water to collect and leak where it shouldn't go.
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