Remove the insulation between the joists where the flue is located to clear an area about 18 inches away from the flue on each side.
Fireproof insulation around stove pipe.
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Fiberglass insulation is naturally fire resistant.
It is often installed in gaps around the chimney and flue to prevent airflow that can siphon the heat away from the interior of the building.
You should never have insulation in contact with a wood stove flue pipe.
Everguard insulation mix is a ready mix vermiculite based insulation material.
Apply a thick bead of high temperature caulk the flue on one.
As such it can be used to insulate a chimney.
Compressed rockwool is generally used as the infill insulator on twin wall flue systems so shouldn t be any problems filling the void just as long as no leaks shouldn t be where any soot build up from escaped gases could be accumulated.
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Most code jurisdictions require the stove pipe be routed through a thimble to provide a safe distance from combustible materials.
This makes it an ideal insulation material for use in areas that experience high temperatures.
Air traveling over the surface of the flue pipe may be required to keep it safe and cool.
Pour the mix around the chimney liner while shaking the liner.