#11  
Old 01-04-2011, 10:18 PM
Tenorio74's Avatar
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Default Re: Fireclay vs refractory mortar (for setting oven floor)

True, but it apparently did *something* insulation-wise, would you agree?

I did get to make the guy put a whole roll of fiberglass blanket on top of the dome, and with about an inch of mud on top, it only went up to 32C with the middle of the dome going white.

What would the veredict be down-under?
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  #12  
Old 01-04-2011, 10:25 PM
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Default Re: Fireclay vs refractory mortar (for setting oven floor)

The dome would go white no matter what as all that indicates is that your fire has reached 600 degrees c, the important thing is to store the heat with some mass, bricks, clay, rocks, glass and then retain it with ........

good insulation like ceramic fibre matting, vermiculite, top and bottom of the oven.
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Last edited by brickie in oz; 01-04-2011 at 10:39 PM. Reason: clarification
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  #13  
Old 01-06-2011, 04:49 PM
Tenorio74's Avatar
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Default Re: Fireclay vs refractory mortar (for setting oven floor)

Quote:
Originally Posted by brickie in oz View Post
Sounds like a lack of insulation problem?
Right. I had about 3 inches of regular concrete under the red brick floor (which has now been promptly removed). Under that was the dirt/powdered glass/etc etc mix the andean oven makers use. And under that is the hearth slab.

So I'm keeping the soil, pouring a second concrete floor on top (thinner though), and then using my 2" fiber board insulation, plus the 3" firebrick on top.

Thanks all, and I will let you know how it goes (at least I can fire it up straight away ).

If you want something done right, you have to do it yourself....

Ah, and I got the fireclay! Clay = arcilla in spanish. I'd totally forgotten, we play tennis mostly on clay courts down here (canchas de arcilla).
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