To do it right, you have a mason come in and put flashing in there. Make sure they use steel flashing though instead of the cheapo aluminum.
To DIY without masonry, you can use flat flashing, caulking each indivual one separately. Put a nice bead in there and push the flashing into it. This works much better than putting the flashing in first and caulking just the shingles to the stucco. Use a good quality caulking like OSI or Vulkem, and you shouldn't have any problems with cracking. The next roof will probably need some repairs to the stucco though. This isn't the best option, but it works. :yes:
To DIY without masonry, you can use flat flashing, caulking each indivual one separately. Put a nice bead in there and push the flashing into it. This works much better than putting the flashing in first and caulking just the shingles to the stucco. Use a good quality caulking like OSI or Vulkem, and you shouldn't have any problems with cracking. The next roof will probably need some repairs to the stucco though. This isn't the best option, but it works. :yes: