EPScrete is cool stuff, insulating concrete, I built a little machine to grind up styrofoam, and use epscrete extensively, last place I used it was behind the chimney on a fireplace, wanted to keep the chimney heat in the house, put a rock & mortar wall at the sides and front of the chimney, the rocks get nice and warm while the outer wall stays cold.
Have offered in the past to describe the techniques if there is any interest.
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