[Greenbuilding] air sealing a metal fireplace flue

[Alan Abrams]

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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