The porch area was severely rotten, so we tore it all out and reframed. Of course, the existing house dips and leans in various directions, so we had to try to make the best compromise between plumb walls and meeting up with the old work.
To make the process even more difficult, there is an old carport (closed in at some point in the past) right in front of the back wall. This really made it hard to tear out the old work and get the new walls in place. It's not pretty, but we managed. I still have some work to do, but for now I sheathed over the two new window openings until the windows arrive.
The carport is not physically connected to the house, even though there's only a couple inches between them. Obviously, without support on the open end, the carport has racked to the side about 4 inches. At some point the carport will have to be rebuilt, but that's a future project outside the scope of this work.
So, I'm trying to figure out the best way to flash the intersection of the house and carport. My main concern is keeping water out of the house, which I can accomplish by just continuing the siding behind the end of the carport. But, I don't really want water coming in at the gap between the two buildings either.
I don't know how stable the carport is. It may continue racking in the future, or it may have leaned as far as it's going to. But, I don't want to compromise the new work by tying into an uncertain carport.
My in-laws had a new roof put on a couple of years ago, and the roofers just covered the top of the carport step flashing with a board and caulked the top where it attached to the wall. While I'm not crazy about that approach, I can't really think of a better option.
What would you do?