Preferred insulation and thickness

[acafro]

Thanks acafro. I seem to be seeing conflicting reports with the need for *all* arch board surface to be covered with the brick. Some of my searching suggests you can leave it exposed to the flame (away from direct contact with wood) like you suggest. Others have said the arch board can disintegrate if exposed to flame.

I picked up a few more bricks. I'm going to brick the entire box anyway. I'd rather be safe I guess.

This is how I did mine, I could touch the sides with bare hands when it was running full tilt.





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