Wonderboard (concrete tile underlayment) can handle 250F

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Wonderboard is concrete between two layers of fiberglas mesh, you could try a layer of that and see.

Or if you can keep it out of the rain or covered, a layer of Kaowool mineral wool (oil furnace firebox insulation) with another layer of light sheet metal on the outside.

Firebrick isn't so much insulation as thermal mass to moderate the flow.

Posted on Dec 11, 2011, 10:47 AM

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