just had original roof on 45 yr old house replaced (tear off some sections of rotting plywood, new GAF "weatherguard" protective sheets over new plywood, and new 25 yr GAF shingles with 25 yr warranty)....
job looks ok (passed inspection by twp), BUT, from a distance in the backyard, it doesn't appear totally flat & level - in fact, it sort of looks a bit "wavy" when compared to the old roof.
it's not "that" bad, but it still is enough to notice when comparing to the old roof.
contractor, "GAF Master Elite" certified outfit, says it's a common problem and will eventually flatten out on it's own after the weather warms up, cycles, etc.
said the tolerances of the roofing rafters also has a part in it. it's a 3 bedroom ranch home, about 1000 sq ft (my 81 yr old moms house).
any opinions on this ?? did they do a bad job and giving me a line of BS ? or is it nothing to worry about (given the 25 yr GAF backed labor/material warranty against leaks, etc).