I am replacing my roof in the Pacific NW and was wondering what the best option for flashing my furnace vent would be? Its a concentric PVC vent so nothing fancy, but i haven’t been able to find a good example of flashing for that other than the typical galvanized plate with a rubber gasket. I’ve heard those never last as long as the rest of the roof and i’m hoping to avoid a leak in 10 years. The cap on the vent makes it impossible to just slip a new collar over it. I’m planning to strop by the roofing supply place today but thought i’d toss it out here first. Thanks!
EDIT: My furnace pipe is concentric, so i cant just cut it and couple it back together. I ended up talking to the local ABC Roofing shop and picked up a supposed lifetime alternative to the usual Oatey pipe flashing. I would post a pic but my account was put on hold 4 days ago and i cant post anything else.