I just received a quote from a roofer to re-roof my house (tearoff).
They are proposing to "Flash Chimney with a 4.2mm layer of Granulated Modified Bitumen² Membrane material, and seal with Solar Solar Seal® 900 Sealing Compound".
I am only familiar with metal chimney flashing (galvanize steel, lead, copper). I certainly want the most durable as well as leak proof flashing material.
Is Bitumen Membrane appropriate for flashing a chimney? If so, is it better, worse, more expensive or less expensive (short-run and long run)?