Misc Info: 1. Our house was re-roofed fairly recently, so this water damage may have happened before the new roof (maybe because of improper chimney/roof flashing?).
Questions: 1. Do I need to do anything about the few inches of rotten rim joist? (Fig 3)
2. There were giant ant colonies between building paper and wood sheathing (and we have also had ant problems in the kitchen -- that's the kitchen behind the patio door). Is there anything I can do to prevent colonization, or is that something I just have to live with?
3. It looks like the builder used exclusively small pieces of plywood for the sheathing. Why is this? Is this best practice (to allow for expansion/contraction, or something), or is this shoddy workmanship?
4. There are gaps between each patch of sheathing, and if I were a bug, I would have no problem infiltrating our house. Should these be caulked, or should I do anything about this? Should I put larger pieces of plywood down in place of the small pieces that I will have exposed?
5. What's the best replacement for the building paper that's there now (the ants love it)? Should I use Tyvek anywhere?
6. I'm assuming I need to sheath/paper over the door opening (Fig 5)? Anything else with regard to the door opening?
7. Do I need to flash, caulk, or otherwise waterproof the bottom of the sheathing where it overhangs the sill plate? There is nothing really there now, just somewhat overhanging building paper.
8. Do I need to caulk the seam that runs vertically along the chimney? If so, would it be between the chimney and the new sheathing, building paper, or maybe Tyvek?
9. Is there anything that I've missed that I also need to do?