[Wormius]

It doesn't appear that the leaks are really anything to do with the ducting or vent caps, but I am just trying to figure out now why roofing company says they installed gooseneck style vent caps that had collars on them, when there is clearly no collar to attach the duct onto. The only collar that is there is a 3" piece, that was secured only from the inside of the attic. Since the roofers didn't go into the attic or replace any of the ducts. At this point, I just want them to replace the vent caps to at least have a collar and a flapper to accomodate the 4" ducts.

I guess its not a huge deal, I could use the 4" to 3" reducer, and use tin snips to make tabs like what was done with the other, but it seems like it could be done better.

Edit: talked to the roofer, he suggested that creating a sort of “p-trap” with the flexible ducting will mitigate against leaks.