Thankfully, you've got that header, so you can get away with replacing the joists to the header and not have to replace the entire roof system.morrisey0 wrote: ↑Sun May 26, 2024 2:50 pm I really was hoping it wasn't going to be very bad, and it was going to be concentrated in one area, but nope. The issue is (and was) failure of the headwall flashing, and it should have been fixed the first time around. The first 2' of plywood is shot from one end to the other, and 4' in some spots. Most of the joists are bad 2-4' from the top also. I am not a framer or a roofer, but I am going to see what I can do here. Cut out the bad, replace with good. The only part that I have to really think about is the original problem, the flashing. I am going to take that part slow.
That wall to roof transition flashing should have been replaced with the new roof, which will entail removing the bottom row of siding from the wall. I would recommend doing this after you've rebuilt and reroofed the house. That is to say, the new roof should be laid up to the wall, then the new flashing should be installed. This will prevent damage to the flashing during the roofing process and ensure that it sits tightly against the roof surface.
What is the slope angle, or pitch of the roof? This is typically expressed as rise and run, say 4/12, which means 4" of vertical rise for every 12" of horizontal run. Composition roof materials cannot be any less than 2/12
I would also take this time with the ceiling open to upgrade or add any wiring or lighting. At the very least, change the fluorescent fixtures to LED (about $40 each), this will provide you with much better lighting. You could also change them to LED recessed lights which would modernize the look and feel of the space, give you more head room by getting them into the ceiling instead of hanging from the header, and with the right style you will be able to control the temperature (color) of the light. If you choose dimmable lights, that will give you control over lumens (brightness/intensity) of the light.