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Cinder block enclosure has cracks in grout lines - Forno Bravo Forum: The Wood-Fired Oven Community

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Cinder block enclosure has cracks in grout lines

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  • Cinder block enclosure has cracks in grout lines

    Hi,

    A friend of mine just had a modular oven installed. The enclosure is surrounded with a cinder block structure and covered in stucco. The void was filled with a mixture of perlite and cement. Not sure the ratio. He is getting cracks all over the oven where the cinder block grout lines are. Also a few small ones in other places. Do you have any idea what could be causing this? It stared to happen with the curing fires!

    Thanks,

    Scott D.

  • #2
    Re: Cinder block enclosure has cracks in grout lines

    Post some pics, that always helps with answering a question. It sounds like the cracking is because the stucco is bonded directly to the block, which will expand and contract differently than the stucco. I always have seen an uncoupling layer between the stucco and the wall. I'm no stucco expert though....
    Old World Stone & Garden

    Current WFO build - Dry Stone Base & Gothic Vault

    When we build, let us think that we build for ever.
    John Ruskin

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    • #3
      Re: Cinder block enclosure has cracks in grout lines

      I don't have any photo's, but I could try and get some. The stucco coating is a smooth coat. If that matters. Thanks,

      Scott D.

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      • #4
        Re: Cinder block enclosure has cracks in grout lines

        Outer finish doesn't matter.
        Old World Stone & Garden

        Current WFO build - Dry Stone Base & Gothic Vault

        When we build, let us think that we build for ever.
        John Ruskin

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        • #5
          Re: Cinder block enclosure has cracks in grout lines

          Originally posted by sjdritz View Post
          The void was filled with a mixture of perlite and cement. .
          Not that this is causing cracks but why did he add cement at this point? To the problem; is the foundation sound? Since this is outside of the insulation heat should not be the cause (unless the ratio was WAY off).
          Check out my pictures here:
          http://www.fornobravo.com/forum/f8/les-build-4207.html

          If at first you don't succeed... Skydiving isn't for you.

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          • #6
            Re: Cinder block enclosure has cracks in grout lines

            The foundation is sound.

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            • #7
              Re: Cinder block enclosure has cracks in grout lines

              If you mix cement with perlite or vermiculite then you also have to add a huge quantity of water. If the water turns to steam suddenly then rapid expansion takes place which can cause cracking. Adding cement to the mix will reduce the layers insulating capacity and the expanding steam problem both make a vermicrete mix problematic. If possible loose vermiculite is preferable like a situation where it is enclosed by a structure.
              Kindled with zeal and fired with passion.

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