I have installed a 6" pipe through an 8" opening in my brick chimney. I don't want to mortar in a thimble in case I move up to 8" again. Is there an expanding foam that can handle the heat of the stove pipe or some kind of exhaust cloth that I can fill the gap with. It is covered from sight by the trim ring.
Sealing around stovepipe
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You need something that is rated to at least 2,000F. That said, I think the only legal way to do it is to use a steel thimble.
How about a fiberglass blanket just like what is used in fiberglass bat home insulation? Just remove the paper first.
shawneyboy
Minister of Fire
boatboy63 said:
No way to fiberglass. I do believe it will melt. Roxwool would be an alternative but I am unsure on the legality of using it in this type of instalation.
Shawn
Maybe you should let the stove manufacturers know that. My U S Stove Magnolia uses a fiberglass rope gasket on the door as well as on the top collar where the pipe goes into the stove. BTW, melting temp is around 2500+ deg F. At this temp, the pipe will be melting too.shawneyboy said:
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