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Firebox question. My tank I'm using for firebox isn't as thick as I would like but going with it so if I need to I'm going to insulate it, but going to try it first. If I do insulate it do I need to reconfigure the size of the box?
No need to reconfigure to FB... Insulation will just hold the heat in... It will work OK as is... If it's really thin, you can add 1" fire brick in the bottom and up the sides of the FB about 1 brick high.. That will keep the fire from eating out the FB....
For me I would look at how over sized am on my firebox and what will adding to interior do to my sizing. If it drops me below 100% I would not insulate the inside with firebrick. I would look into what I could do on the outside.
So slow progress and now big disappointment just getting around to cutting my FB/cc opening and got a look at how thick cc is and it's only .03 thick is this worth my time to continue or should I find a new cc