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rbigante 09-12-2008 10:20 AM

Vermiculite versus perlite
Any advantages to using one material over the other for the insulating hearth? Is there a specific grade that I need to obtain? I see that these are used in the gardening industry, is it the same stuff?

Thanks, Rino

dmun 09-12-2008 10:25 AM

Re: Vermiculite versus perlite
There's a silicone coated vermiculite that you don't want (it doesn't adhere to the concrete) Anything sold for agricultural use is fine. Perlite and Vermiculite both work the same. It mostly depends on cost/availability.

rbigante 09-12-2008 04:54 PM

Re: Vermiculite versus perlite
dmun, thanks for reply. helps alot because i'm having a tough time finding a place nearby that sells vermiculite. i may have to order online???

adman2u 10-08-2008 07:57 PM

Re: Vermiculite versus perlite
I found my vericulite in the garden shop of Home Depot is was about $16 for a huge bag. I mixed it about 50/50. I also placed a single piece of cardboard between my insullation and solid pour for expansion. So far so good after about 20 fires but ask me in a year. Pictures in gallery under name showing steps for my pizza oven / tandoori grill / smoker combo. Have done all 3 successfully in same unit.

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