Hi, I've just bought a wfo from a shut down small restaurant & rebuilding it in my garden. The plans I have recommend using a 1" lean cement (9 parts sand 1 part cement) on top of the concrete hearth support, and then their fire bricks, 30mm deapth on top of that. Having read your Pompeii plan (excellent by the way!) there doen't seem to be enough insulation in my oven hearth? I guess the sand is acting as insulation but is it enough? Can anyone advise? Many thanks, Alex
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hearth insulation layer