insulated fire box options??

bigbook · Post by **bigbook** » November 20th, 2013, 8:35 pm

I can get castable fire brick rated concrete and pour it into the interior walls of the firebox one side at a time. or is there a diff method you would recommend . this would be in a 1/4 inch fb

Gizmo · Post by **Gizmo** » November 20th, 2013, 9:13 pm

HOLY CRAP!

I would just put Roxul in the gap and call it good but Castable fire-rated concrete?

You're the kinda guy I could hang around!

Clover Ridge Smokers · Post by **Clover Ridge Smokers** » November 21st, 2013, 7:40 am

Post by **Rodcrafter** » November 21st, 2013, 8:01 am

Wow!

That sounds great. More than I would do, but I would like to see you do it. That really sounds wrong doesn't it?

The Czar · Post by **The Czar** » November 21st, 2013, 10:17 am

Wow....just wow....

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Big vin · Post by **Big vin** » November 21st, 2013, 12:25 pm

But would it be a good isolation material?

bluecatfish · Post by **bluecatfish** » November 21st, 2013, 1:13 pm

My question is how thick would the insulation be and how much weight would it add?

Post by **Rodcrafter** » November 21st, 2013, 3:00 pm

A friend of mine builds crematories and incinerators, he uses a lot of that stuff. He calls it refractory it works great but it is heavy like cement. I think you would need to have a way for it to move as it heats up. May need more research to be sure. The way they are used in his environments they are formed poured then the form removed so the fire is in contact with the refractory. I think it is the same stuff used in the"Ole Hickory" smokers.

Clover Ridge Smokers · Post by **Clover Ridge Smokers** » November 21st, 2013, 7:51 pm

Due to the weight, I would look at mineral wool or something like that.

Rev.Mike · Post by **Rev.Mike** » November 22nd, 2013, 7:25 am

having worked in several foundries, if its the same type of refractory thats used in blast furnaces, and such, its quite heavy!

and most times when you first let it set, you have to burn it in so to speak, much like with a smoker, let it come up to temp, but once its hot, its HOT! i have a wood stove in my shop that we lined the walls of it with refractory, heats really great, for heat retention, it will stay hot for a good day and a half if you get it really hot, as far as an insulation, it would work, but will also retain heat too, FWIW

bigbook · Post by **bigbook** » November 26th, 2013, 3:29 pm

It is indeed refractory cement I use in my boiler repair . If i dont use it as cb insulation i might pour some over the cb/cc opening as a heat sink instead . Forgot about the heat retention property of the stuff

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