I know there has already been LOTS of discussion on this, but so far I fail to see any real concensus.
I'm ready to pour the insulating slab and see numbers anywhere from 5:1 to 10:1 for the vermicrete mix. Doing a little math I come up with something like 1 PSI that will be actually built on the slab. Sure, the whole thing is heavy, but all that mass is distributed over a fairly large area. I understand that the vermicrete will always remain soft (like cork), but the heat sink slab on top of the vermicrete (I'm building a modified AS design baking oven so am planning on a bit of mass in the hearth) will be solid concrete.
I guess what I'm asking is, does the 10:1 mix actually have enough cement in it to set? or should there really be a little more cement in the mix?
I'm ready to pour the insulating slab and see numbers anywhere from 5:1 to 10:1 for the vermicrete mix. Doing a little math I come up with something like 1 PSI that will be actually built on the slab. Sure, the whole thing is heavy, but all that mass is distributed over a fairly large area. I understand that the vermicrete will always remain soft (like cork), but the heat sink slab on top of the vermicrete (I'm building a modified AS design baking oven so am planning on a bit of mass in the hearth) will be solid concrete.
I guess what I'm asking is, does the 10:1 mix actually have enough cement in it to set? or should there really be a little more cement in the mix?
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