[Greenbuilding] air sealing a metal fireplace flue

[Norbert Senf]

Check the ICC Excel installation manual:
http://www.icc-rsf.com/c/iccrsf/file_db/pdfs.pdf_en/XLUSA-II_2012-01.pdf

I notice they have a trim plate, which you could use to cover the gap and
caulk to the chimney with silicone. You can use high temp silicone to seal
the pipe joints.

It is a very high quality chimney with excellent technical support, so you
can call them and ask them for recommendations for your
situation................Norbert


On Tue, 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, AIBDcertified 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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-- 
Norbert Senf
Masonry Stove Builders
25 Brouse Road, RR 5
Shawville Québec J0X 2Y0
819.647.5092
www.heatkit.com
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