Situation- only thing left in original chimney stack is the vent for the
gas water heater. (Furnace goes out side wall just above ground level
now.) Chimney stack and flashing above roofline is failing, and may be
slightly leaking, judging by stains on bathroom ceiling right below it.
I have been quoted $800 to demo and rebuild chimney stack from roofline
up, using proper flashing instead of sheet goods and tar and gravel like
roofing company used. My father, the 83 YO house designer, suggested
that I should simply demo top part of chimney, patch roof deck and
shingles, and use a prefab metal exhaust pipe instead. How tall would it
have to be? Wind and snow load is a consideration. 5-12 roof, and
current chimney is higher than ridge line of roof. I'm concerned that a
real tall metal stack would look funny and unacceptable to any future
buyers and house inspectors.

Thoughts and ideas?

--
aem sends...