Sorry - another Vermiculite Question Pompeii Oven Construction Discuss Sorry - another Vermiculite Question in the Pizza Oven Design and Installation forums; Sorry I didn't see your post earlier. I used the fine vermiculite, 5:1, worked great. It took a week to ...

[Bandrasco]

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.

[david s]

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.