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Help with Casa2G90 castable refractory pitting - 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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Help with Casa2G90 castable refractory pitting

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  • Help with Casa2G90 castable refractory pitting

    Upon firing up my oven this past weekend, I noticed that the lip around the oven door had some small pitting. I started digging at one with my finger, and it literally just crumpled away.

    I installed the oven in September 2013 and have used it approximately once per week or so. I broke it in as stated in the manual, letting the curing fires run 12-14 hours per day for 5 days straight at recommended temperature. I'm not sure if this is a castable refractory problem or what, but any thoughts as to what is going on would be very helpful.

    I called FB, and was told they can send me a patch, but did not really answer my question as to what caused this.

    For more information on my build, you can visit my page here:

    My build:


  • #2
    Re: Help with Casa2G90 castable refractory pitting

    This is just my first thoughts, but it simply appears to be small areas where entrained air in the casting material got "stuck" and failed to migrate to the top when it was vibrated. Surface tension and other factors cause small bubbles to hang up at the margins where the castable material contacts the mold.

    The same thing happens in concrete when it is poured and is why one will often see workers hammering the forms when a concrete pour is made in an attempt to free the bubbles and have them migrate to the top surface. These small bubbles often have a thin shell next to the mold which in time breaks revealing the small cavity (formerly a bubble). Mostly this is cosmetic and not to be too concerned with (at least regarding overall strength of the structure). Most people are unaware that in the case of concrete one deliberately adds air entraining agents to the mix to create very small bubbles which actually improves the strength and other properties of the concrete.

    In this case I suspect the small bubbles were entrained during mixing.

    Hope this helps,


    • #3
      Re: Help with Casa2G90 castable refractory pitting

      Thank you Wiley.
      Just heard back from the FB rep, who said it was due to improper curing or moisture in the oven, which didn't sound right to me.

      They are sending out some sort of a "kit" to repair this. Not sure what the contents are or what it entails, but we will see.
      My build: