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Render question - Forno Bravo Forum: The Wood-Fired Oven Community

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Forno Bravo Forum Community,

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.
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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.

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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Render question

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  • Render question

    I have read the archived posts on stucco and render but still have a few questions. Thanks for any help.

    I have a bunch more firings before I put the 2 render coats on my vermicrete layer. The vermicrete has formed some large expansion cracks that open and close with temp changes. I plan on using surface bonding cement with the liquid additive to form the stucco layer which I will later paint with stucco masonry paint.

    I read that you would first fill in the cracks with SBC before the first layer goes on. If I cover the cracks when the oven is cool, I don't understand how the cracks won't bust through the stucco layers when heated up. How do you handle the expansion cracks so they don't crack the stucco?

    Also, how long should you wait after the first coat before putting the finishing stucco coat on the oven?
    Thanks

  • #2
    Re: Render question

    Don't worry about the vermicrete layer cracks. The layer is not structural. The only reason to add cement, and therefore water is so the stuff will stand up vertically on its own. If adding vermicrete to an enclosure style oven it is better to add the vermiculite dry. The problem you now have is that you have to eliminate the water otherwise the steam pressure can crack the outer stucco.the dryly vermicrete is slightly elastic anyway so won't cause a problem so long as it's dry. Try placing some plastic sheet when firing, over the vermicrete to test if water condenses under it to test if all the water is eliminated from the vermicrete.
    Kindled with zeal and fired with passion.

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    • #3
      Re: Render question

      Thank you David, but even if the vermicrete layer is dried out, won't the cracks that already exist continue to expand and contract as the oven is fired? If the cracks go up and down based on when the oven is hot/cold, then how do you prevent the stucco layer from cracking also?

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      • #4
        Re: Render question

        As he said, the vermicrete is not structural, i.e. it will not mirror through the render/stucco. Do not fill the cracks with SBC (that is for structural, non thermal crack repair), fill them with either loose vermiculite or a very high ratio vermicrete (like 8 or 10 to 1).
        Last edited by Tscarborough; 07-25-2012, 07:29 PM.

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        • #5
          Re: Render question

          I understand now, Thanks

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