I laid my hearth yesterday, which consists of a 5" vermiculite layer with an insulating board inlaid under the centre of the dome - I know it's not pretty! I only put the board in as I had it given to me (thank you David) and thought it would be good to use it. Anyway, I thought I'd ask all you structural engineers out there if any of you foresee future problems before it's too late to turn back...
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