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.
Fireproof insulation around stove pipe.
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Apply a thick bead of high temperature caulk the flue on one.
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.
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Pour the mix around the chimney liner while shaking the liner.
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Everguard insulation mix is a ready mix vermiculite based insulation material.
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.
This makes it an ideal insulation material for use in areas that experience high temperatures.
Finally prepare for adding insulation foam or additional fiberglass batts by installing a second piece of vertical sheet metal that provides a 2 inch airspace around and parallel to the chimney.
Simply prepare by gradually adding 4 7 gallons of water.
Fiberglass insulation is naturally fire resistant.
As such it can be used to insulate a chimney.
You should never have insulation in contact with a wood stove flue pipe.