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Repairing small cracks - Forno Bravo Forum: The Wood-Fired Oven Community


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Repairing small cracks

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  • Repairing small cracks

    Yay!!! In light of your patience factor <grin> you may find it
    cracking. Despair not. Just get a tube of Furnace Cement (not mortar).
    It comes in tubs or caulking tubes...the tube is perfect.

    Ignore the instructions and pop a fire in the oven. This will open up
    the crack a bit. Then go through with your caulking gun and apply the
    cement to the crack. Be generous. You need heat to set it and since
    the outside doesn't get very hot, you need to have a fire going inside
    to open the crack and to get the cement hot enough to set. If it's a
    pesky crack and you need to reapply, grind a slight groove with an
    angle grinder along the crack or use a church-key or screwdriver to
    groove it a bit before going the cement route.

    Once the cement has a chance to cure it's as good (maybe better) as
    new. Furnace cement has a 2000F temp rating (which is why you want it
    & not the furnace mortar).