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-   -   Vermiculite after curing? (http://www.fornobravo.com/forum/f2/vermiculite-after-curing-14716.html)

phippsj 11-03-2010 05:21 PM

Vermiculite after curing?
 
I am just about done with the dome, so I am now starting to think through the final process. I will be curing with vermiculite all around the exterior of the oven. However, I was planning on curing the oven prior to adding the exterior insulation (to be able to see cracks and correct if necessary).

When I add the external vermiculite, will moisture get back in? Do I essentially need to cure the oven twice in that case?

Thanks!

dmun 11-03-2010 07:37 PM

Re: Vermiculite after curing?
 
Yes, vermiculite absorbs LOTS of water. It's why it's used as a soil conditioner in agricultural use. Once you pile on your vermiculite concrete, it will be wet all over again.

This doesn't apply if you're building an enclosure, and pouring the vermiculite in loose.

phippsj 11-04-2010 06:11 PM

Re: Vermiculite after curing?
 
I am building an enclosure. Would pouring in loose vermiculite have the same thermal benefits as the vermiculite/cement combination? Six inches of loose vermiculite and I am good?

Laku 11-05-2010 10:51 AM

Re: Vermiculite after curing?
 
Quote:

Originally Posted by phippsj (Post 101855)
Would pouring in loose vermiculite have the same thermal benefits as the vermiculite/cement combination?

Probably better than vermicrete as it doesn't have the binding cement to transfer what small amount of heat it transfers.

Bambalorna 11-06-2010 07:17 PM

Re: Vermiculite after curing?
 
Quote:

Originally Posted by dmun (Post 101800)
This doesn't apply if you're building an enclosure, and pouring the vermiculite in loose.

I'm building an enclosure and using 3 inches of insulation-blanket around the oven. A neighbor from southern France says they fill the enclosure with sand. Is vermiculite much better than sand?

Laku 11-08-2010 10:18 AM

Re: Vermiculite after curing?
 
Quote:

Originally Posted by Bambalorna (Post 101921)
Is vermiculite much better than sand?

Yes. Sand is more an addition to oven mass than real insulation.

Neil2 11-08-2010 11:05 AM

Re: Vermiculite after curing?
 
One advantage of a weak vermiculite/cement (12:1) mix for the dome insulation that it will eliminate loose vermiculite from seeping or blowing out of joints in your enclosure. (In any case, your enclosure should be well vented to keep the insulation dry.)

Bambalorna 11-08-2010 07:15 PM

Re: Vermiculite after curing?
 
Quote:

Originally Posted by Laku (Post 101969)
Yes. Sand is more an addition to oven mass than real insulation.

Thank you Laku, much appreciated


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