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Making countertop cement refractory - 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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Dome Installation Video - Casa / Premio / Modena

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Making countertop cement refractory

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  • Making countertop cement refractory

    As part of my outdoor kitchen project, I am looking to build a firepit of the design below (drawn up with firebrick lining) and my thoughts are to encase concrete blocks with Quikrete countertop cement. It should be easy enough to form up, but would like to get some advice in making it refractory.

    If lining with firebrick, do I (refractory) mortar the firebrick right to the concrete block?

    Instead of the firebrick liner, is it possible to add a portion of fireclay to the countertop mix on the inside of the pit and skip the firebrick? The advantages of going this route is I only have to pour it once and the color remains consistent throughout. I am thinking of a concrete thickness (inside, top and outside the block) of 3".

    Any/all thoughts appreciated.

    John

  • #2
    Re: Making countertop cement refractory

    A fair amount of the heat you put in will wick away into the concrete bricks. You could lay a bed of vermicrete say about 2" thick to avoid the heat loss, then give it a layer,say 2" of refractory concrete. A castable refractory would be best, but a mix of 1/4" aggregate, sand, cement and lime (6:4:1:1) should suffice and be much cheaper. Have done a bit of thought on exactly the same kind of project, but never got further than a brain plan. Let us know how you go.
    Kindled with zeal and fired with passion.

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    • #3
      Re: Making countertop cement refractory

      You have a lot of things working against you on a project like that. Monolithic structure, inside corners, etc.

      If I were going to do it for someone else (because I would not do it for myself), I would build the walls and floor of the actual pit from 5 "sheets" of (castable) refractory about 2" thick, maybe 3" for the bottom. I would assemble them in such a way that they could expand, and edge the top with a semi-embedded angle. I would also embed lifting hooks in the floor. See attachment.

      If you do it like that, the rest should be alright using the countertop mix.

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      • #4
        Re: Making countertop cement refractory

        Thanks Tom. I may be extending my abilities by tackling something like this although your diagram makes sense and I'm sure I could form five 2"-thick sheets of castable. I'm not sure I could apply the countertop mix in the short time that I have, so I may have to rethink my design.

        Thanks again for your quick reply.

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