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Castable refractory cement mix - Forno Bravo Forum: The Wood-Fired Oven Community

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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.

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Castable refractory cement mix

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  • Castable refractory cement mix

    I'm about to cast my vent and have 25 lbs of this dry mix which can yield 2 sq/ft at 1 1/4" of cement.
    My question is, can I add some crushed firebrick to this mix to increase volume? I understand I'm altering the mix ratio by doing this and thus may weaken the cast.
    My reason for doing this is because I may not have enough cement to fill the mold....it's close by my estimation.

    George
    George

    My 34" WFO build

    Weber 22-OTG / Ugly Drum Smoker / 34" WFO

  • #2
    Re: Castable refractory cement mix

    You can do anything, once.

    I would think it depends on how much you are going to add and how challenging a shape your vent casting will be and the limitations of the refractory. This is a critical piece, so best to call the manufacturer or order some more.

    I ran into the similar problem with mine, as I was casting the dome plug and the vent transition and wasn't sure there was enough KS-4. I ended up tapering 4 sides of a full brick and sitting that in the middle of the dome plug. I figured if the bond let go the taper would hold the brick. So, far it is still bonded very well, brick and plug are solid.
    Wade Lively

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    • #3
      Re: Castable refractory cement mix

      Thanks Wade. The vent shape is very a simple rectangular box with a slight curvature at the front face.
      I think I will take some firebrick remnants and crush them down to tiny pieces and add them accordingly to the mix.

      George
      George

      My 34" WFO build

      Weber 22-OTG / Ugly Drum Smoker / 34" WFO

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