Roof Vents

[brosnt1]

I have 6 of the plastic square roof vents that are just down from the peak. My question is: if you re-roof, do you install the vents after shingling or is it better to cover the entire base of the vent with shingles. they were just tucked up under 1 or 2 rows of shingles with 1/2 of the flange above the shingles.
any information or opinions will be greatly appreciated.

[markts30]

The flange at the top should be under the shingles and at the bottom should be on top...
Sounds like the roof you are re-doing was done right.

[PEW]

You may want to consider replacing the plastic vents with metal ones as part of the re-roof. The plastic ones have a limited lifetime which will lead to leaks.