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Fire Brick Size? - 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.
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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 Brick Size?

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  • Fire Brick Size?

    Hi,

    We have quite a few fire brick that are 2.5-7"X5X18 long, also our design is almost all exact dry fit.

    How much mortar is required if the bricks fit tight?

    Anything that I should know about using such large bricks in the hearth and back wall?

    Thanks
    Derk

  • #2
    Re: Fire Brick Size?

    Using large brick is actually good for the hearth. The less seams the better for cooking since the the hearth/floor is the surface where the food will be cooked. If your brick is 5 inches thick then you'll have more thermal mass than most other oven's built with the FB Pompeii Plans. Standard firebrick is around 4 inches thick you see but I don't see any problems with that. Worst consequence is that it will take you a few minutes longer to heat up the floor.
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    • #3
      Re: Fire Brick Size?

      Thanks for the help.

      I remeasured my brick and it is 4 1/2 inches thick. It is also new firebrick from a scrapped steel factory, they had many, many, many thousands of different sizes. The company selling it said it was good for 3000 degrees F. We are planning on a 27X41 oven floor with a 14 inch arch height. We are designing a barrel oven. Does anything sound funny with those numbers?

      Thanks for your advice.

      Derk

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      • #4
        Re: Fire Brick Size?

        With a 14" arch height, your opening will need to be around 8.75 to 9 inches tall. That seems pretty low. My barrel vault is 22"Wx36L" long, with an dome height of 22" and an opening of a tad over 13".

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        • #5
          Re: Fire Brick Size?

          I am still in the dry fit, see what size I really want stage.

          Thanks for the help.

          Are there any other critical measurements that I need to be aware of before I start mixing cement?

          I could just add a brick or two to the arch and opening and I could come close to your measurements. Does it draw ok?
          I have ordered all of the most popular and recommended books through interlibrary loan to get all the knowledge I can before I start.

          I will try to post a few photos this evening of what I have to work with.

          Thanks again,

          Derk

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          • #6
            Re: Fire Brick Size?

            One match fire start and not a whiff of smoke out the front.

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            • #7
              Re: Fire Brick Size?

              Is the bottom of the flue pipe at the inside height of the dome or the opening?

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              • #8
                Re: Fire Brick Size?

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                • #9
                  Re: Fire Brick Size?

                  Thanks !

                  That is the picture I have been looking for!

                  Did you use regular mortar to full in the space or Refractory?

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                  • #10
                    Re: Fire Brick Size?

                    Home brew refractory. Link in sig has all the pics.

                    Last edited by Tscarborough; 04-14-2010, 07:43 PM.

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                    • #11
                      Re: Fire Brick Size?

                      More great pictures. Thanks

                      Is this order correct:

                      Block stand
                      30X30 slabs--concrete?
                      Perlite/concrete insulation layer?
                      Thin layer of mortar to set firebricks
                      oven floor

                      I have seen a few designs that have an isulating layer recessed in the top cavity between the blocks, a layer of cement that spans the blocks and then oven floor.

                      I am about to get serious but I am still looking for fireclay to make my own homebrew. So far $29.00 to ship a $15 dollar bag,50 lbs.

                      Derk

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                      • #12
                        Re: Fire Brick Size?

                        Have you googled masonry suppliers for your area?

                        Yes, I had some old 30x30x2 inch pads I used instead of placing a slab, then 4" of perlcrete, a mortar leveling bed, then the floor.

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                        • #13
                          Re: Fire Brick Size?

                          I have found a few ceramic/pottery places I am going to try tomorrow. There seems to be different types of fireclay. Is your percrete pad sturdy? Hold the weight well ? Compress? There seems to be many approaces to slab, insulation, floor percrete combinations.

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                          • #14
                            Re: Fire Brick Size?

                            Ceramic/pottery places around here charge $9.50 for a firebrick while the masonry supply houses charge a buck fifty for the identical unit.

                            The compressive strength of 8-1 or even 12-1 is more than adequate for this application. There are many ways to skin the cat, but the purpose is to build a thermal mass, highly insulated.

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                            • #15
                              Re: Fire Brick Size?

                              Tom,

                              What was the recipe for your home-brew fireclay mortar? there seems to be many skinned cat ideas on this also.
                              I have found fireclay (dry) here in Salt Lake. It is about $16.00 per 55lb but no shipping.

                              Derk

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