Originally Posted by
Michael Thomas
Just to be clear, is this an additional layer of shingles in addition to the starter course (marked with an arrow below) at the eaves?
Michael,
No.
That *is* the "starter course", they just used regular 3-tab shingles flipped around backward with the slots up. Does the same thing as a "starter course strip".
On top of that goes the "first course" of shingles.
Besides, you would *not* want an additional layer of shingles along the drip edge, that would just create a dam and hold water back.
Like John, I thought Patrick was referring to the rakes. I've never done it that way along the rakes, but I've heard of other doing it like that for the reason John gave. To me, if that is the reason, why not just install a low gravel stop for the rake drip edge? The small raised edge of the gravel stop would do the same thing, only better, and would not create a lateral cross-flow across the roof like installing two layers down the rake would.