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Type of sand for sand form in cob oven - Forno Bravo Forum: The Wood-Fired Oven Community



I'm Peter Reinhart! Ask Me Anything! Monday, February 15, 2016 7:00-8:00 pm EST

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.

Ask Me Anything New Forum Feature

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.
- Another thread will be posted for the live AMA. Registered users who are logged in during the live session can interact with the host by asking questions and receiving responses.
- The live thread will remain in the AMA forum to view after the session.

We hope you enjoy this new feature! Please let us know if there is a topic that you'd like to have as an AMA and we'll look for a host!

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Type of sand for sand form in cob oven

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  • Type of sand for sand form in cob oven

    Hi everyone, I'm almost at the point of ordering sand and clay for building the dome. From what I've read, angular sand is recommended for for the actual dome, but I can't find anything on what to use for the form.

    Is angular sand also best for making a sand form that'll stay together, or do I need a smoother, more fine sand? My oven will have a 30" inner diameter.

  • #2
    Re: Type of sand for sand form in cob oven

    Sharp grained aggregate is best for all masonry work.
    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


    • #3
      Re: Type of sand for sand form in cob oven

      Put a small amount of clay in the sand and slightly damp so that it holds its shape for the mold. Include some plastic drink bottles in your mold you'll have less sand to shovel out at the end.
      Regards dave
      Last edited by cobblerdave; 08-02-2013, 01:11 PM. Reason: Spelling
      Measure twice
      Cut once
      Fit in position with largest hammer

      My Build
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      • #4
        Re: Type of sand for sand form in cob oven

        If you want to get really accurate the ratio is around 10% water. Polystyrene fruit boxes are also good to stack under the sand castle to reduce the amount of sand required. Use a stick, cut to length, of the internal dome height, placed vertically in the centre of your floor.It is pretty easy to get a perfect hemisphere by eye, working from the centre point at the top and down to your perimeter at the base. Use the flat of a trowel to tap the sand into the required form on the outside.
        Kindled with zeal and fired with passion.