Just had a new roof put on after a hail storm. After it was first put on, we pointed out some issues that the contractor sent back two guys to resolve, some of the issues were improved but still exist, namely, there was a distinct line across the front of the house from a row of shingles being set at narrower lap. After "fixing" it it was still somewhat visible to the ground so I climbed up on the roof to inspect. What I found was that while the average exposure is about 6" per row, there are these two rows that are 4" and 4.5" exposure. There were several other lines visible upon closer inspection, each with about 4.5" exposure.
My question is what is an acceptable variation in shingle exposure? Manufacturer specs say 5-5/8 exposure and after climbing on the roof even the rows that look good range anywhere from 5.25" to 6.25" with the average being closer to 6". I'm trying to decide how picky to be with my GC but don't really know what is an acceptable variation in exposure since I know perfect isn't reasonable across a whole roof.
My question is what is an acceptable variation in shingle exposure? Manufacturer specs say 5-5/8 exposure and after climbing on the roof even the rows that look good range anywhere from 5.25" to 6.25" with the average being closer to 6". I'm trying to decide how picky to be with my GC but don't really know what is an acceptable variation in exposure since I know perfect isn't reasonable across a whole roof.