The Super Isol insulating board has better compressive strenght than vermiculite concrete and better insulating characteristics as well (see http://www.skamol.com/pdf/1%5Bcalciu...s%5DLetter.pdf and http://www.schundler.com/vermcon.htm), and while it's not cheap it would save a lot of time and would eliminate concerns such as getting both pours done in one day.
Any actual experience comparing the materials?
Any actual experience comparing the materials?
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