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Vermicrete Ratio Clarity - Forno Bravo Forum: The Wood-Fired Oven Community

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Photo Galleries are back! Instructions below.

Dear forum users,
Thank you for your patience with the Photo galleries. We've got your galleries online!
We have finished writing a custom script to migrate the PhotoPlog to vBulletin5’s albums.

Unfortunately V-Bulletin killed the "Photoplogs" in their software upgrade which was unforeseen and we're the first development group to have written a script for getting the galleries back... that said, it took some time to reverse engineer the code and get the albums to move over seamlessly!

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Dome Installation Video - Casa / Premio / Modena

Hello,

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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Vermicrete Ratio Clarity

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  • Vermicrete Ratio Clarity

    Right... I need a little clarity before a f**k up...

    Vermicrete... I'm reading ratios from 5:1 all the way to 20:1 for vermiculiteortland; which is fair enough. What would people suggest?

    Secondly, are the ratio by volume or weight? The vermiculite here is sold by volume, but the portland by weight. So if it's volume, how many litres is a 20kg bag of portland cement?

    M.

  • #2
    Re: Vermicrete Ratio Clarity

    Originally posted by Spinal View Post
    Right... I need a little clarity before a f**k up...

    Vermicrete... I'm reading ratios from 5:1 all the way to 20:1 for vermiculiteortland; which is fair enough. What would people suggest?

    Secondly, are the ratio by volume or weight? The vermiculite here is sold by volume, but the portland by weight. So if it's volume, how many litres is a 20kg bag of portland cement?

    M.
    5:1 is recomended for under the floor and dome. 10:1 is most often recomended for insulation over the dome.

    The ratios are by volume.

    I cant help you on the metric system, but I wouldn't get hung up on Pi-R-Squaring too much. If you use the same or equal size containers to measure the volume of each , you will be OK .
    I don't care what folks say behind my back........They are either braggin' or.......lyin'

    joe watson

    My Build
    My Picasa Web Album

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    • #3
      Re: Vermicrete Ratio Clarity

      Cool - volume it is, and 5:1

      Thanks!

      Comment


      • #4
        Re: Vermicrete Ratio Clarity

        FYI, 94# portland cement = 1 CuFt.

        Comment


        • #5
          Re: Vermicrete Ratio Clarity

          5:1 for under the floor to provide a higher compressive strength for supporting the weight (and still provide adequate insulation).

          For over the dome, where high strength is not needed, use as little cement in the mix as possible. The lower the cement content the higher the insulation value. The recommended ratio is in the order of 10:1 or 12:1.

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          • #6
            Re: Vermicrete Ratio Clarity

            Expect about a 14% reduction in volume once mixed with water and cement. Mix by hand, not in a mixer, to reduce this problem.
            Kindled with zeal and fired with passion.

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            • #7
              Re: Vermicrete Ratio Clarity

              Since portland tends to break down from thermal cycling at around 500F, how do the prescribed ratios (5:1 under-floor, 10:1 on-top-of-dome) respond to the tempertures radiating from below and above an oven?

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              • #8
                Re: Vermicrete Ratio Clarity

                The outside temp of the dome or floor brick will be lower so it should only be the vermicrete in direct contact withe the brick that would be experiencing temperatures that would be damaging to the Portland. Of course if you have blanket between them the temperature would be way lower. If anyone demolishes an oven or removes floor bricks, tell us what the vermicrete looks like.
                Kindled with zeal and fired with passion.

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                • #9
                  Re: Vermicrete Ratio Clarity

                  Well, I have fired a 1400 degree gun at perlcrete 6-1 for about 15 minutes, and other than glowing red hot there was no degradation (or heat transfer through 3"). The heat degradation that takes place is basically a reversal of the process that hydration of portland cement creates, i.e. it will return to powder. That is aside from the effects of aggregates, which are not normally used in perlcrete anyway.

                  Short answer: Intermittent indirect heat of 500-800 degrees will not destroy portland mixes in the short term. Direct flame temps WILL.

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                  • #10
                    Re: Vermicrete Ratio Clarity

                    Thanks guys. I feel comfortable installing vermicrete under my stainless entryway floor now.

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                    • #11
                      Re: Vermicrete Ratio Clarity

                      Great - thanks

                      Vermiclete slab went down yesterday - now I'm waiting for the lot (concrete & vermicrete) to cure; then a week of drying of the vermicrete before I continue the build!

                      M.

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                      • #12
                        Re: Vermicrete Ratio Clarity

                        Good plan.
                        Kindled with zeal and fired with passion.

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