Hello, experts of the Internet. My HVAC company is installing a new furnace in the attic space. I had my roof recently replaced two months ago. With the exhaust vent installation, I wanted photos of how this flange was installed to ensure it was done correctly. The individual who installed it shared with me this photo. It seems as though the upper aspect of the flange was tucked underneath the shingles, the sides were not tucked over the flange, and everything was caulked with silicon

This does not look very good to me, but I wanted to see if this would be standard for a pre-existing roof and new vent/flange installation.

Update : see my comment below for the repaired work.

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