Old 01-19-2009, 04:29 AM
Bandrasco's Avatar
Join Date: Oct 2008
Location: Tampa, FL.
Posts: 208
Default Re: Sorry - another Vermiculite Question

Sorry I didn't see your post earlier.

I used the fine vermiculite, 5:1, worked great. It took a week to really set up. It has worked out great so far, I don't have any probes in the floors or walls so I haven't been monitoring the temp drop but the oven holds temps that can cook for days. I used 4.5" of vermic/port on top of 4.5" concrete. The iso boards may work better though. In theory they would seem to have less of a heat sink property. On my dome I used 3" of Cerablanket by Thermal Dynamics, wire and vermicucrete at about an inch or so, then a waterproofing compound, stucco mix, then a layer of high grade exterior latex stucco paint (until I can get it covered with more brick). Absolutely zero heat transfer to the outer shell. Even after 4-5 hours of roaring fires.

Good luck.

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Old 01-19-2009, 01:08 PM
david s's Avatar
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Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 5,159
Default Re: Sorry - another Vermiculite Question

Yeah when you mix it up it is still loose and you think that it wont stick together, but it does, and when dry theres still plenty of air in it and not too much cement. Try it next time. For 10 L vermiculite add 1 L cement powder and 3 L water.
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