thomas rubino wrote: Or see if your local county road crew might have an excavation project going someplace.
Michael Gillingham wrote:Erik,in your last paragraph you talked about heat transfer with pebbles being better than sand.That will actually be to my benefit because when I break up the block there will be pieces from pebble to golf ball and larger.I thought that any air space would act as an insulator.This build is in my garage and it only needs to keep the temps hopefully above 40.The block pieces will be contained in a block box which will be about 18" high 15 ft wide and 32" deep.That will allow me to test it with only block fill and see how it goes.Thanks again.
Stinging nettles are edible. But I really want to see you try to eat this tiny ad:
Morgan Superwool Plus non-ceramic fiber blanket for Rocket Mass Heatershttps://permies.com/t/153507/Morgan-Superwool-ceramic-fiber-blanket