#1  
Old 10-27-2010, 07:17 PM
Laborer
 
Join Date: Oct 2010
Location: new zealand
Posts: 62
Default Hearth insulation. Vermiculite v pumice

Hi there everyone, I have just found out about this site and have now decided to change my plans for a pizza oven to on of these ones. I have already built the base so now have to look at extra insulation in the hearth. In New Zealand fire bricks and vermiculite are pretty expensive $7 - $8 per brick and $10 for 5 litres of vermiculite. Has any one ever used pumice and concrete in the hearth instead of vermiculite? Would the thermal value be reduced too much?
Look forward hearing your thoughts.

Cheers
Kris
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  #2  
Old 10-27-2010, 07:37 PM
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Location: New Jersey USA
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Default Re: Hearth insulation. Vermiculite v pumice

Pumice works, the ancient romans used it, it's way better than some of the workarounds like sand or broken glass. You may need more than the four inches you need for vermiculite or perlite.

8 dollars for a one dollar firebrick? What are they doing, shipping them by parcel post?
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Old 10-28-2010, 04:06 PM
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Join Date: Oct 2006
Location: Vancouver Island
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Default Re: Hearth insulation. Vermiculite v pumice

Check for perlite. It does as well as vermiculite.
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Old 11-23-2010, 04:36 AM
spt spt is offline
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Join Date: Feb 2009
Location: New Plymouth, New Zealand
Posts: 25
Default Re: Hearth insulation. Vermiculite v pumice

Hi Kris

I am from New Zealand and also in the process of building an oven. I managed to pick up 100 litre bags a vermiculite from a garden supply off the internet for around $60.00 - do a search and find the cheapest. Also using fire bricks from placemakers for around $6 each after getting a discount for bulk purchase. Unfortunately we do seem to be paying way too much for bricks in New Zealand compared to others on this site.


Regards

Dave
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