How do I flash the intersection of a wall and a shed roof? The last course of 3-tab shingles came out where I had to trim 1/2″ off the back to butt them against the wall and have them hit the next row in the right place. I got some galvanized L flashing and un-bent it some. If I put that in place, it comes out just uphill of the sticky strip on that last shingle row.
So that’s where I am. What next? Do I cut down another row of shingles to just tabs and put those down before the flashing? Or do I put down the flashing and nail down the cut off row of shingles on top? Asphalt cement on the nail heads? Something just seems wrong with nailing through the flashing. But I guess I’m getting the wall water on top of the shingles? But won’t water just build up on top of the flashing in that pocket formed when the sticky stuff seals to the top cover-up shingles?
Maybe I do both? More shingles to cover that sticky strip, and then a duplicate row to cover up the flashing.
This flashing is not pretty. I sure hope I’m not supposed to just leave it exposed. My Architectural Graphics Handbook shows it like that for copper roofs, but surely that’s not right for 3 tab fiberglass reinforced asphalt. I hope.
Thanks for advice,