I hired a GC to run some vents in my building. The plumber seems to have done a fine job from what I can see, but the “roofer” did some hack work. Looks to me like boots for a metal roof. Screwed down with sheet rock screws with some blackjack squirted around.
Am I wrong to make him come back and use a glue down boot designed for a rubber membrane, or is this acceptable?