What kind of shingle is this?

Too late natty, Job's already done. Didn't bother with pic's on this one but it turned out great. It's rained cats and dogs twice since I finished it and not a drop. In fact, I did nearly 200 repairs in the last year and not a drop on any of them.

It was leaking on the right side ( first pic ). They used 4 x 4 roof to wall flashing instead of step flashing, had it installed slanted down into the roof to the right instead of down flush and then made holes all in it by gun nailing the shingles right down into the flashing. :huh:

Il never understand that mentality. They could have pulled the crap wall flashing out and swapped in steps for less $$/time than it cost them in spraying caulking at all possible surfaces. Other than that it looks like they did a nice straight job, why wreck it.

Natty, I concluded the flashing was leaking by process of elimination. There simply was nothing else wrong. Great brick mortar and a nice new cap. Then there was the nasty stain on the ceiling under the right side of the chimney. If I had taken the pic from below the chimney, you could see how the base flashing on the right side is slanted.

After I removed all the flashing, I discovered lumps of concrete on the right side. That is what prevented the base flashing from being level. I chipped it down below the roof deck with the axe end of my plumb hatchett and went back with step flashing.