ok, going crazy with google. pretty much useless or im not using it right.
anyways...what would be the minimal clearance between a 6" single walled
flue and the closest stud/ceiling joist/whatever. they will be wrapped in
5/8 firecode sheetrock and/or 1/2 denzshield.
Whatever the required clearance is, it is measured to the nearest
combustable surface, i.e., the stud. What that stud is covered with is
immaterial AFAIK. My clearance is right at the miniumum but I had to
convince the inspector that the 1" he was complaining about was all
sheetrock and not combustable. He was measuring to the surface of the
BTW. 1" sheetrock was due to remodel. Had to space out the finish
stuff with a 1/2" strip to match up wall surfaces.
Here in Washington state, the clearances are dictated by the manufacturer
of the woodstove. Stoves are tested and rated accordingly, and
clearances vary from one stove to the next (even from the same company).
When I installed my stove, the inspector came out, checked the
installation manual, and made sure my clearances met or exceeded the
If you know the brand and model of your stove, check to see if the
manufacturer has a web site with specifications for your stove.
For "unlisted" appliances (antique stoves, used stoves, or other stoves
than have not been rated), the clearances are rather large. I think the
stove has to be something like 36" away from any combustible surface. I
think the chimney pipe can be closer, but since it comes out of the top
of the stove, it's usually equal to or greater than the stove clearance
(unless your wall or ceiling slopes).
You can reduce the clearance by using double-wall chimney pipe, and/or by
building a special shield between the stove and combustible surfaces.
Where the chimney pipe actually passes through the ceiling, I had to keep
the ceiling framing at least 2" from the chimney pipe. I opted for 3"
clearance around the pipe. This is for triple-wall pipe, I don't know
what the requirements are for single wall (or if it's even allowed where
it penetrates the ceiling).
In any case, check with your local building department. They're the ones
who will give you final approval, and can provide the information you
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