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How about an earth/refractory oven? - Forno Bravo Forum: The Wood-Fired Oven Community



I'm Peter Reinhart! Ask Me Anything! Monday, February 15, 2016 7:00-8:00 pm EST

To kick off our AMA feature, we have invited author, chef and master bread maker and host of Pizza Quest, Peter Reinhart, to be our first host! Peter will be in the Forum on Monday, February 15th, from 7:00 - 8:00 pm EST. If you are unable to be online during the live session, you can post your questions in the sticky post. Peter will answer those questions during the live session on February 15th. You can view Peter's answers to your questions as well as what happened during the live session in the session thread.

Ask Me Anything New Forum Feature

You will notice a new forum at the top of the main page called, "Ask Me Anything". This forum will be used for live one hour "Ask Me Anything" (AMA) sessions hosted by people who are knowledgeable in different areas pertaining to wood fired ovens. How it works:
- Each AMA will have a "sticky" thread where the community can post questions they would like answered during the live session. This will allow everyone to participate even if you can't be online for the live session. These questions will not be answered by the host until the live AMA; if you need an answer quickly, you should post it in the appropriate Forum area for the community to respond.
- Another thread will be posted for the live AMA. Registered users who are logged in during the live session can interact with the host by asking questions and receiving responses.
- The live thread will remain in the AMA forum to view after the session.

We hope you enjoy this new feature! Please let us know if there is a topic that you'd like to have as an AMA and we'll look for a host!

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How about an earth/refractory oven?

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  • How about an earth/refractory oven?

    I don't really know what I'm talking about, but would it make any sense to build an inexpensive earth oven, but stabilize the earth mix with refractory cement, and make it modular for mobility? I really want the mobility feature, but of course, want to pay next to nothing for it. Any advice would be greatly appreciated.

  • #2
    Re: How about an earth/refractory oven?

    Earth ovens don't vitrify - they dry out and harden, but they don't become glass like fired ceramics. Moving such a thing, even a little, would cause it to crumble.

    Also any talk of refractory concrete is incompatible with talk of saving money. Boy is that stuff expensive.

    We all like to save money, and you'll find a lot of suggestions for that here, but you have some real problems with your idea as it stands.
    My geodesic oven project: part 1, part 2


    • #3
      Re: How about an earth/refractory oven?

      Originally posted by dmun View Post
      Also any talk of refractory concrete is incompatible with talk of saving money. Boy is that stuff expensive.
      I got a quote from a local outfit here in Houston called Able of $27 for a 75 lb. bag of their lowest-duty refractory which works out to $0.36 a lb. (Refractory Castables, Refractory Plastics, Refractory Mortars) By way of comparison, my 9 lb. firebricks were $1.20 or $0.13 a lb.

      On the otherhand, REFMIX is about $2.50 a lb. HeatStop 50 is just a little less shipped from the factory. I have spent over $250 just on 5 bags of REFMIX.

      A Casa90 is 650 lbs according to the spec sheet. Let's say 150 lb. of that is the floor. The 500 lb dome could be cast for $180. I have NO IDEA whether "AbleCast" is an appropriate product. I have attached a datasheet. I would imagine that at the least, it is an upgrade option over "mud" or clay.

      The only cheaper option might be firebrick, homebrew mortar, and a chisel or angle grinder. A HF tilesaw alone makes the brick option more expensive than this.

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