New shingles were installed yesterday, but the roofers didn't shingle over roof vent flashings in a couple of spots. They left one side unshingled. On the other vents, there're shingles all around. Actually what it looks like they did was to shingle underneath the flashing, which wasn't done on the flashings that are covered. Does this make any difference?
Something else they did that looks a bit out of the ordinary if I am able to describe it. When they shingled a valley they cut the shingles straight down the center of the valley (the top shingles anyway - I assume there are shingles beneath that they overlap). The shingles don't "span" from one side of the valley to the other, overlapping as they go up. That's how the old roof was done. I'm concerned that water will have a greater chance of settling in what is now a well defined straight edge. If I've described this well enough to be understood, does this way of doing it sound OK?
Thanks for any input.