Hi... I have a pellet stove vent pipe on my roof that has corroded, and needs replacing. I went up there yesterday but was unable to remove the top piece of pipe. My guess is that there's a locking ring beneath the vent flashing, between the piece of pipe i want to remove, and the piece that's half in/half outside the house.
My question is... if I dislodge the flashing and am able to get beneath it, can I reuse that piece (nailing it back and resealing it)?