I'm reconfiguring plumbing and need to poke a new vent through the roof of my Chicago two-flat. It's a built-up roof of tar, felt, etc., with a slight grade. How to finish the roof portion so that there are no leaks?
The vent will be of PVC and will connect to a kitchen DWV system. I see many rubber collars available at the hardware store most expressly prohibit use with built-up roofs.
I intend to upgrade the roof but I'd like to be able to wash my hands first. Is this the kind of repair only a roofer can do?