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Not so sticky mortar - Forno Bravo Forum: The Wood-Fired Oven Community

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New Forno Bravo Forum Feature

Forno Bravo Forum Community,

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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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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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.

https://www.youtube.com/watch?v=-7q7...jSniYogfUra06Q

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.

Thanks for participating in our Forum. We will have more video content available soon.
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Not so sticky mortar

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  • Not so sticky mortar

    Hi everyone,

    I'm a couple of days into my build and have just changed mortar from Vesuvius Tuffset premix to FFR dry mix and have noticed the mx yourself dry stuff is nowhere near as sticky as the premix.

    I've read in here that that shouldn't be a problem but it just doesnt seem right while doing it. I changed simply because when I picked up m mortar the guy was really friendly and gave me a 3/4 full tub of premix that he'd opened and now wasn't going to use, so I used it first.

    Should I be concerned the dry mortar doesn't get as sticky or better still, are there additives that will make it stickier?

    I've tried detergent and lime but they didn't seem to make a noticeable difference.

    Thanks,

    Bevan.

  • #2
    Re: Not so sticky mortar

    The mortar does seem to be sticking well after a couple of days so I shouldn't have worried, and I'm now getting it to flow a lot better by soaking the bricks for a couple of minutes beforehand and spraying the bricks it will go on too.

    I do have another question though about filling gaps. There seems to be lots of theories and every theory has a supporter and a objector. I'm thinking that if you can make concrete by adding aggregate to mortar, then why can't you make refractory concrete by adding aggregate to refractory mortar and use it to fill the gaps and give some strength?

    If I add 4-6mm river stones to my mortar, can I use it to fill larger gaps? Has anyone ever tried this?

    Thanks,

    Bevan.

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    • #3
      Re: Not so sticky mortar

      I'm not sure about this but the river rocks may have a different thermal expansion rate than the mortar and this could present problems. The smaller the aggregate the more this problem would be reduced. Grog (fired ground up clay) would be a safer bet IMO as would be the brick dust from cutting your bricks. However the river rocks may also work, we only fire to around 500 C, but that is the temp where some materials start to undergo rapid thermal expansion.
      Kindled with zeal and fired with passion.

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      • #4
        Re: Not so sticky mortar

        Go and buy some premixed in the tub, problem solved.
        The English language was invented by people who couldnt spell.

        My Build.

        Books.

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        • #5
          Re: Not so sticky mortar

          Thanks for the replies guys. Just by chance I came across the Darley Firebrick company which happens to be just around the corner from my house - don't know whay it hadn't come up in any of my searches in the past couple of months!

          Had a good chat to the owner there and he was incredibly helpful. Got some new mortar (cement fondue) and will be giving it a try over the weekend.

          I asked about making a castable or concrete and yes, you can just make it by adding aggregate to the mortar, but he agreed that river pebbles may cause problems as you don't know what the composition is. But, washed riversand can be used to bulk it out as it has a high silica content and I'll need to make a bit of my own grog to help also. I would have bought some grog also but they were out due to problems at the factory.

          Turns out that the Vesuvius mortar I was using is an airset product that is no good for gaps over about 3mm or exposed joins as water disolves it! Beautiful to use in the right situation though (inside the dome on neatly fitting bricks). Might have to rework a couple of joints - bummer.

          For anyone in Melbourne, Australia, who needs products though, this is a great place to go to.
          Darley Firebrick Pty Ltd, Melbourne, Victoria

          Bevan.

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