Should it be insulated and or airsealed around the ceiling penetration.
Insulation around chimney in attic.
As such it can be used to insulate a chimney.
Apply a thick bead of the high temperature caulk around the joint where the flue enters the attic.
This has been a debated topic in my office for a few days now.
Insulating around these ixtures see page 2 2 attic air sealing and adding insulation are do it yourself projects if your attic is accessible and not too dificult to move around in.
I m just looking for some more ammunition for my arguement.
Fiberglass insulation is naturally fire resistant.
A chimney flue passing through a second floor ceiling into an attic space.
8 cut a piece of flashing to measure the circumference of the flue plus 6 inches.
The projects recommended in this guide can usually be completed in a day or two and will provide beneits for years to come.