Hi MPB,
I used to install fireplaces, solid fuel or gas, and we used to lay the hearth on a concrete mix of sand with lime in it and cement. I think in your case a normal mix of sand and cement would be fine. It will not be kicking out as much heat as a solid fuel fire I would have thought.
Hi, Have you thought of using lightweight breeze type insulation blocks on their side. These can be cut with a hacksaw to any size- normally 8*4*18 inch- usual breeze block size. I've cut them to 2inch thickness fairly easily.
Not much mess- easy to cover etc. (a specially strong blade is available).
You can't cut ordinary breeze.
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