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Fire clay between bricks in floor (time to start over?!) - 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.

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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Fire clay between bricks in floor (time to start over?!)

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  • Fire clay between bricks in floor (time to start over?!)

    Hello:
    I have been working together with my friend on my oven. Although I have been up to speed at every step, today I couldn't be around for the laying of the brick floor.
    I came home and found that he had filled in the small gaps between the bricks in the floor with fire clay. Having read the plans and previous posts I know this is a "no no" (they fill in with ash etc).
    How bad a move was this? Should we tear up the floor and start over? Obviously I would like to avoid this option...Should I try to dig out the clay between the cracks?
    Any advice is greatly appreciated!

  • #2
    Re: Fire clay between bricks in floor (time to start over?!)

    Hi Carlos,
    Im not an expert, but I dont really see what it could hurt, It will surely harden up once you start your fires,, and whatever spaces are left open will fill with ashes like you said,,
    Keep going and smile

    Mark

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    • #3
      Re: Fire clay between bricks in floor (time to start over?!)

      Most brick floors have only minimal cracks if they are laid with uniform sized modern firebrick. It really doesn't matter what ends up in the cracks, wood ash or fireclay. Did you brush in dry fireclay, or lay them with a wet layer like mortar?
      My geodesic oven project: part 1, part 2

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      • #4
        Re: Fire clay between bricks in floor (time to start over?!)

        He used wet refrax and set them in between each cooking tile. The mortar has now hardened. It sits slightly below the surface of the cooking floor so it shouldn't catch a peel or anything.

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        • #5
          Re: Fire clay between bricks in floor (time to start over?!)

          Sounds good,,, so dont worry and enjoy

          Mark

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          • #6
            Re: Fire clay between bricks in floor (time to start over?!)

            would like to get some advice on using heat bond refractory mortar(which i get locally). can i mix with portland cement to build the pompeii dome? i use air bond refractory mortar n did ok......would like to explore with heat bond mortar.

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            • #7
              Re: Fire clay between bricks in floor (time to start over?!)

              Heat Stop is specific on its label NOT to mix with anything. It bond and hardens beautifully and I saw no need to add any other cement.

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              • #8
                Re: Fire clay between bricks in floor (time to start over?!)

                would like to explore with heat bond mortar.
                There are thousands of refractory products from many manufacturers. I don't know specifically what you are talking about, but there are wet refractory mortar products which are designed for repairs in boilers and furnaces which have to get back into service immediately. They are designed to set at high heats. They have proved to be less than useful in wood burning ovens which don't reach those high temps.

                Except in our "home brew" refractory mortar, portland based mortars aren't recommended.
                My geodesic oven project: part 1, part 2

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                • #9
                  Re: Fire clay between bricks in floor (time to start over?!)

                  I "grouted" the floor and interior walls of my first oven with 3 parts type S (portland cement based mortar) and 2 parts fireclay. Follow-on ovens have the walls grouted, but not the floor, although I use my homemade mix on the bottom of the bricks to level them and "hold them".....

                  After firing, this cement has hardened, and become part of the firebricks. Maybe I got the oven too hot, but after I say how my homemade refractory mortar worked, I threw that miserable Aluminum Silicate out. It is simply too hard to use.

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