Can I Plant Grass On Crushed Shale

2014319when clay, shale or slate is crushed and then exposed to high heat 3,600 0f and cooked for a period of time, they expand like popcorn into a very hard rock that is very porous and light weighthere are many names used for these products such as haydite, buildex, expanded shale, etcepending on the source material and where you live.

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