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Flue mortar - solution for too wide mortar joints? - 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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Dome Installation Video - Casa / Premio / Modena


For many of you who bought a modular oven, you may have asked how we put the domes together when we build them. For those of you considering one of our ovens, we shot a video to make your install easier.

Check it out on our You Tube Channel.


If the link doesn't work, simply go to You Tube and type Forno Bravo Channel. The video title is How to Set your Forno Bravo Oven Dome Pieces.

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Flue mortar - solution for too wide mortar joints?

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  • Flue mortar - solution for too wide mortar joints?

    I came back from the brickyard with castable refractory cement to mortar my firebricks. It didn't look right - had aggregate in it. So I called the manufacturer and learned what I feared - no good for mortar joints.

    After some conversation where they assured me the 50 pound buckets of pre-mixedrefractory mortar I had been using really weren't right for the job either. Refractory mortar shrinks, they explained.

    Instead they suggested something they're selling as flue mortar - ALSEY Flue-Set Non-Water Soluble Refractory Mortar to be specific. They said it is harder to work with, but is good for filling larger voids, like untapered arch bricks, plus its OK exposed to the weather after 24 hours.

    I'll buy a 50 pound bag (over $100!) but wondered if others have had experience with it?

  • #2
    Re: Flue mortar - solution for too wide mortar joints?

    There's a few references to the stuff here in the forum:


    Nothing like the hundreds of cites for the more common mortar choices.
    My geodesic oven project: part 1, part 2


    • #3
      Re: Flue mortar - solution for too wide mortar joints?

      I can tell you that I purchased at least 3 50 pound buckets of premixed, and a bag of dry stuff, then switched to the homebrew recipe listed on this site, and was more satisfied with the home brew, and with what I have left over from the 20 bucks for the homebrew, I probably could build a whole extra oven. Spend the 20 bucks on the lime, type S portland cement, fine sand and firemortar. Mix it up and play with it. Easy to work with, and has a great track record here on this site. As I look back over time, I would guess that hundreds of builders of ovens here have used it, and years later still report great results. Speaks for itself.

      Good Luck