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.

I burnt 2 chord of wood last season and all of my arch board looks brand new, other than where some of it got hit by wood. Any insulation directly exposed to heat would probably eventually degrade over time. I expect to have to replace my arch board every several seasons, just PM in my opinion.


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