#1  
Old 03-11-2014, 01:12 PM
Serf
 
Join Date: Mar 2014
Location: Central PA
Posts: 3
Default Powdered Fire Clay

How many lbs of fire clay do you guys estimate i'd need for a 36" build ~using 3 sand to 1 clay ratio. I am in the planning stages and digging clay isn't a good option for me. Thanks!
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  #2  
Old 03-28-2014, 06:48 PM
Peasant
 
Join Date: Nov 2012
Location: Arizona
Posts: 33
Default Re: Powdered Fire Clay

I had the same problem...digging for clay here is almost impossible, so I went with Muddox powdered fire clay on my build. If I remember correctly, I went through seven 50-pound bags for my build. I did, however, go through a lot of it when I made the insulating pad under my oven's floor. I probably went through two bags right there to make clay slip to mix with perlite. On the outside of the dome, I used Portland cement mixed with perlite and vermiculite (the Portland cement was much cheaper). On a guess, I would say I used between 4-5 bags of powdered fire clay to build my dome. My dome is about 36" deep by 27" wide. The thickness of my dome is horribly inconsistent (I tried to keep it about 4" thick but it's thicker in spots), so you might be able to get away with using a bit less if you're more careful about it than I was. I used a 3 part sand to one part clay for my dome as well, so I'm guessing you'd be using about the same give or take. Hope that helps!

Here's a link to my build if it helps you at all. On the first page is a picture of the powdered fire clay I used, about halfway down the page:

http://www.fornobravo.com/forum/f43/...ild-18673.html (My first WFO build...)
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Old 03-28-2014, 08:17 PM
Tscarborough's Avatar
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Join Date: Oct 2009
Location: Ausitn
Posts: 3,128
Default Re: Powdered Fire Clay

Fire clay and sand is not a mortar you know. It is simply chinking material, it has no adhesive or hydraulic properties at all.
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Old 03-28-2014, 11:37 PM
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Join Date: Jan 2010
Location: brisbane australia
Posts: 2,479
Default Re: Powdered Fire Clay

Quote:
Originally Posted by sidamo View Post
How many lbs of fire clay do you guys estimate i'd need for a 36" build ~using 3 sand to 1 clay ratio. I am in the planning stages and digging clay isn't a good option for me. Thanks!
G'day
Just to clarify ..... You are talking about a cob oven aren't you?
Regards dave
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Old 03-29-2014, 12:07 AM
Peasant
 
Join Date: Nov 2012
Location: Arizona
Posts: 33
Default Re: Powdered Fire Clay

I think he's talking about a cob type oven...that's what I was assuming...I built my whole dome out of a 3:1 sand to fire clay mixture.
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Old 03-29-2014, 01:52 AM
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Default Re: Powdered Fire Clay

Quote:
Originally Posted by Mooveebuff View Post
I think he's talking about a cob type oven...that's what I was assuming...I built my whole dome out of a 3:1 sand to fire clay mixture.
G'day
Yes the fireclay confused me a bit ,more common to use it the home brew mortar.
It would make an expensive hard to procure product around these parts. Easier to get hold of a powdered clay. At the temperatures a WFO operates the high temp properties of fireclay is a bit wasted.
Still in saying that if it works it works. And a lot easier that mining it youself and crushing it. I would like to spend my time on the build personally.
By the way how's your oven doing.
Regards dave
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