How to make a large concrete block lighter?
I am planning on using a 12" H x 18" D x 20' L concrete block as the Hearth of a contemporary wood burning fireplace. The problem with using such a large unit of concrete is the weight of the block. I was thinking of using a high density Polyisocyanurate or Polyiso foam block in the center of the form to take some weight out of the Hearth. I am not sure going with route will cause me any problems down the line and would appreciate any comments you might have.
My goal is to make reduce the weight of the concrete block so any suggestions you have would be appreciated. ( I have read about using ground up plastic instead of rock but I have not found anyone in Salt Lake City using this method.)
Posted Oct 24, 2011 7:48 PM ET
Edited Oct 25, 2011 4:39 AM ET
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