[Greenbuilding] air sealing a metal fireplace flue

Clarke Olsen colsen at fairpoint.net
Tue Jan 21 12:18:00 CST 2014


6" is very small for a fireplace. There is a standard ceiling flange which should work on the first penetration;
I would guess there is another for the top. If you have double wall, why can't insulation touch it?
Clarke Olsen
clarkeolsendesign.com
373 route 203
Spencertown, NY 12165 
USA
518-392-4640
colsen at taconic.net




On Jan 21, 2014, at 12:20 PM, Alan Abrams <alan at abramsdesignbuild.com> wrote:

> got a passive house problem.  (new?)
> 
> owners are set on a wood burning fireplace--a most reasonable desire--except when it comes to air sealing the flue.  Napoleon, the manufacturer, states that a two inch clearance must be maintained around the 6" ID / 8" OD double wall flue pipe.  Insulation in contact with the pipe is verboten.
> 
> given the primary air barrier is the roof sheathing itself, the most reasonable sounding option seems to be a sheet metal flange, cut to fit the elliptical section where the pipe penetrates the sheathing with a gap of maybe 1/4", and caulk it with some high temp pookie.  the sheet metal can then be sealed to the sheathing with some of Ken Levenson's best sticky tape.
> 
> this would still leave the individual joints in the piping, and its connection to the stove itself.  Not sure what to do there, where the stove temp might exceed the capacity of the caulk.
> 
> anyone been there done that?
> 
> -AA
> 
> Alan Abrams
> certified professional building designer, AIBD
> certified passive house consultant, PHIUS
> certified passive house builder, PHIUS
> Abrams Design Build LLC
> sustainable design for intentional living
> cell     202-437-8583
> alan at abramsdesignbuild.com
> www.abramsdesignbuild.com
> 
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