Sealing off around liner at the flue what is proper insulation?

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reed102

New Member
Hearth Supporter
Sep 19, 2006
31
Greenville, Oh
I'm installing a wood burning insert into our existing fireplace which contains a "heat-a-lator clone made by Superior Furnace. It was here when we bought the home and found it to be a total waste. I will have to cut out one of the steel tubes to get the liner thru but at least I won't have to tear out a bunch of steel. I running a 6" stainless liner and have read that I will need to seal off the area around the liner as it goes into the flue. I don't know what type of insulation I should use around this. Is regular firberglass insulation sufficient?
 
No to the fiberglass isulation. It can't handle the heat. A product cal kaowool, or ceramic insulation (refactory insulation) and a block of plate needs to be used at the top of the liner where it exits the chimney and at the fireplace where enters the firebox. I have read that mineral wool or rock wool will work, but not sure. Definetely koawool will work, and a stainless steel block of plate would be best (with stove sealant-not silicone sealant). Do a search on those terms and you will find better info than I can provide.

Here is a nice link on the heat resistence of some diffferent types of insulation:

http://www.procureit.com.au/thermal.html

Good luck, KD
 
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