I'm contemplating tearing down my chimney and putting in a
zero-clearance stainless stovepipe for my oil-furnace instead;
All the stove/chimney/other flue systems I've ever seen have
the pipe from the appliance go up, turn horizontal, and plug
sideways into the chimney stack. Is there any reason
why I shouldn't go straight up from the oil-furnace, through
the roof? It's pretty much open all around.
The International Mechanical Code, what most areas in the US are using will
still require a particular height above pitch for your furnace exhaust. You
may find that that bright stainless pipe sticking so far up on the roof will
be far worse looking than a chimney.
If you do it, check the local codes first. Read Mechanical Code section
BTW, drip legs are not to code, as section 5, of 804.3.5 clearly states. and
this will also add an additional 15 to20 feet total effective length (TEL)
to your exhaust, and as each make of furnace has a total length, you may
find that you have exceeded this with a so called drip leg.
Since you have what is called a forced draft system (oil) you will also have
to insure that each joint is sealed properly. Code section 804.3.1
And I hate to look like I am busting on everyone that has replied so far,
but Mark is wrong about the draft. Oil units are forced draft, therefore
draw isnt an issue since the exhaust will be a positive pressure style.
If you dont mind, why are you considering this? I mean....most people do not
want a mobile home style roof jack on their home.
Ok, does this drip leg need some mechanism for draining the water
out, or is there little enough of it that it's expected to evaporate
Looking at the retrofit chimney liner retrofit kits, there doesn't
seem to be any such mechanism, just a cap for the bottom of
the T. And with a rain-cap there shouldn't be very MUCH outside
What code book covers the rules for this sort of thing?
Is it buried somewhere in the building-code, or do I need
to go find the mechanical code-book, too?
Largely because my masonry chimney is loosing bricks, and
I can't seem to get any professional to do more than
come look at it and say "wow, that's bad"...
I may decide to just rebuild it myself, since the stainless
metal chimneys, while easier, don't appear to actually
be CHEAPER than a masonry chimney, except for the
labor. And since it looks like I'll have to do it myself
anyway, that matters less than it might.
Basically, at the end of this month, I shut the
furnace off, cut a hole in the roof, tear down about 11' of
chimney down through the attic, and staple a tarp over
the hole. I then have until late october to get something
up that costs me less than $7,000 and lets me run the
I don't know how much of it would be considered DIY, but could you learn to
do brick pointing?
Next would be a liner of some sort that goes down from the top. No that we
know the problem, perhaps others have better solutions.
I've seen quite a few homes that have metal flue inside with a
decorative masonry "chimney" above the roof line. Don't know
what code requirements are for this, but as long as you're going
to have to look into your local code requirements anyway, it
might be an option to consider.
email@example.com is Joshua Putnam
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