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Firebrick or builders mortar for floor surround - 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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Firebrick or builders mortar for floor surround

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  • Firebrick or builders mortar for floor surround

    Hi all,

    Have started my outdoor oven project a couple of weeks ago and have got the stand and the base constructed, but have hit a little design problem I could with some advice on. I will post my photos soon, as soon as I get over this delay!

    Basically, I've built my base using a thick oak frame, in the corner of a walled patio, with a stone pillar for the front leg. On top of this is 4x 50mm thick x 600mm square concrete slabs as the base, with 100mm depth of AAC block for insulation layer (beneath the floor).

    I intend to lay a thin layer of stone dust over the AAC block, with brickies sand over that, beneath the fire brick floor. The firebrick floor will be surrounded by clay bricks mortared to the concrete slabs.

    My question is this:
    Should I use normal brickies mortar (6:1, sand:cement) or firebrick mortar (10:6:2:3, sand:clay:cement:Lime) to mortar the bricks to the concrete slabs, that will surround firebrick floor?

    The reason I ask, is that I'm not whether heat will spread down through the floor and weaken the brickies mortar or if I use refractory mortar, whether it has enough cement to be strong enough to hold the floor together, which will also have the arch buttresses on it.

    I hope I haven't made this too complicated, and any advice received with thanks!

  • #2
    Re: Firebrick or builders mortar for floor surround

    On top of this is 4x 50mm thick x 600mm square concrete slabs as the base, with 100mm depth of AAC block for insulation layer (beneath the floor).
    Not familiar with AAC block's R-Value, but neither the insulation nor floor bricks require any kind of mortar at all. Simply gravity. Remember, your floor as well as your dome will expand with heat and break any kind of bond anyway.

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