On May 3, 2:28*pm, "TomR" wrote:
I have an ongoing chimney issue. *My existing 10-foot above-the-roof-line
masonry chimney has to come down because it is in bad shape. *I would like
to take it down to near the roof line (to maybe 1 or 2 feet above the roof
line), and then have the remaining masonry chimney relined and B-vent added
from the roof line up.

Someone suggested that I should try calling HVAC contractors and ask them to
just do the chimney relining etc. without changing or doing any work on my
heater. *What they would need to do is add a flexible metal liner inside my
existing masonry chimney, connect it to a metal double-wall "Type B"
("B-vent") chimney vent coming out of the top of the chimney, add a B-vent
cap on top of that, and point/repair the 2-foot masonry chimney above the
roof line.

Is this something that HVAC companies could or would do -- including getting
the permit for the work, etc?

I know that I can just call some HVAC companies and ask, but I thought that
I would check here first. *I never heard of HVAC companies doing this kind
of chimney work unless it was part of a job that involved repairing or
replacing a heater.

P.S. *The existing heater and hot water heater are gas-fired units, so Type
B ("B-vent") should be fine.

P.P.S. *I also have an ongoing issue regarding how high off the sloping roof
line the B-vent needs be according to code. *Some people are stating that
the rule is that the top of the B-vent needs to be at least 2 feet above the
point where the B-vent is horizontally 10 feet away from the sloping roof..
But, for natural gas appliances (which I have), when using Type B vent less
than 12 inches (mine would be 6 inch B-vent), then the 2006 International
Residential Code for one and two-family dwellings (mine is a one-family),
Section G2427.6.4 on Page 382 would apply.

Here is the link to the 2006 International Residential Code for one and two
family dwellings:http://www2.iccsafe.org/states/newje.../PDFs/NJ_Res_C....

Check out Page 382.

In my case, with a 12/12 slope, In think my B-vent would only have to go up
about 4 or 5 feet from the roof line.

Is that correct?

I watched a guy reline a chimney with a concrete sleeve, on one of the
home channels, a few weeks ago. It looked like a pretty slick process
that produced a good looking solution. But it also looked like it
involved some expertise and special equipment. I don't know that any
HVAC shop can do that. Shop around, or Craigs list might head you in
the right direction.

RonB