We have a duplex where the two units are divided on one roof plane. Only one party wants their roof replaced. The roof currently has 3-tab asphalt shingle. The party upgrading their shingle does not want 3-tab, they want to upgrade to a dimensional shingle. What is the proper way to divide the roof plane?
I have been told to cut a line down the shingles, insert a piece of L flashing then step flash the flashing on both sides, then cap the step flashing on both sides of the L flashing. I can provide pictures to make it easier.! What good does the step flashing do beyond what the piece of L flashing sealed to the deck do?
*** Revised, We used two pieces of 2 x 4 L flashing butted against each other and sealed in between them.
The inspector said it requires step flashing. I cannot find anywhere in any publication where this issue is addressed. If someone can point out to where this issue is addressed, I would greatly appreciate the advise. I do not see how step flashing on top of this L flashing then capped would help in any way. If you can explain how step flashing would work in this situation, please advise.