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Heat stop premixed mortar

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  • #31
    Re: Heat stop premixed mortar

    I looked at some notes I had on my oven in CT.....8:1 on the insulating slab.
    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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    • #32
      Re: Heat stop premixed mortar

      Originally posted by stonecutter View Post
      A week or so. Sooner if you leave the form on.
      If you notice, I'm a big fan of leaving forms on. I never take them off until they have to come off. The longer they stay on, the better. Thanks.
      My Build:
      http://www.fornobravo.com/forum/f8/s...ina-20363.html

      "Believe that you can and you're halfway there".

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      • #33
        Re: Heat stop premixed mortar

        Originally posted by GianniFocaccia View Post
        I agree. I went with an 8:1 vermicrete 'slab', mostly because it was right in the middle of the ratios (4:1 - 12:1) reported here. After installing the vermicrete under 2" of CF board, I placed some of the last batch surplus into a round butter container and let it dry (3 days).

        Even at 8:1, the test 'disk' (6" diameter by 1" thick) was surprisingly rigid and very difficult to compress with my thumb. It had the consistency of one of those puffed rice crackers. I could break an edge off quite easily, but when I placed an 8x8x16 CMU on top of the disk edgewise, it didn't budge.
        Thanks. I think I'll be going w/the 8:1 mix, then.
        My Build:
        http://www.fornobravo.com/forum/f8/s...ina-20363.html

        "Believe that you can and you're halfway there".

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        • #34
          Re: Heat stop premixed mortar

          Just got Heat Stop 50 upstate NY at Herringtons in Hudson NY for $55 a bag, fireclay was $27 for a 50 lb bag. They also have red firebrick at $1.80 each. At that price for HS 50 its hard to justify making your own mix .

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