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samwichse · 12-11-2017, 01:57 PM

Or maybe just add a bag of this to 1cuft of portland cement?

https://www.amleo.com/horticultural-...iABEgImK_D_BwE

First porosity material that popped into my head, and it looks like it's a thing:
SCHUNDLER COMPANY--Perlite Insulating Concrete

12-11-2017, 01:57 PM	#10 (permalink)
samwichse Thalmaturge Join Date: Mar 2011 Location: The edge of nowhere Posts: 1,167 Spicy Italian - '13 Fiat 500 Abarth eBike - '94 Trek Mountain Track 820 CHONK - '18 Honda Clarity Thanks: 769 Thanked 647 Times in 432 Posts	Or maybe just add a bag of this to 1cuft of portland cement? https://www.amleo.com/horticultural-...iABEgImK_D_BwE First porosity material that popped into my head, and it looks like it's a thing: SCHUNDLER COMPANY--Perlite Insulating Concrete