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Removing Forms - Forno Bravo Forum: The Wood-Fired Oven Community

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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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Removing Forms

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  • Removing Forms

    Anybody tell me how long you should keep the forms on after a hearth slab has been poured.
    Mine is Approx 1500mm x 1500mm , corner built , 75mm thick with a counter /shelf at the front . Plenty of 1/2 '' Rebar went into it . The Shelf at the front is canterlevered.

  • #2
    Re: Removing Forms

    i took my forms off the sides after 24 hours, but plan on leaving the ones underneath for atleast a week if not a bit longer just to make sure!!!
    Toby

    Columbus, NE

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    • #3
      Re: Removing Forms

      Toby-concrete needs moisture to cure to full strenght. The underlying bonding is a chemical hydration reaction(hydro/water) It is important to keep it moist for at least a week. That is when most of the reaction takes place. But thirty days is even better. Leaving forms on traps in the moisture. That is good for strenght. But if you leave the forms on for a week, its a bear to pry them free. So masons usually pry forms off after a few days but keep the project moist by spashing some extra water on it each day and covering with plastic. I usually see this done on concrete slabs and walls-(But not on block or brick work--wonder why?) Your can remove the plastic while working and cover each day when you are through. Added bonus it protects your work from the night time rain showers. Good Luck Gloast

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      • #4
        Re: Removing Forms

        I have been giving mine a light coating of water a couple times a day! want it to get as strong as possible--with all the weight that sits on top of them
        Toby

        Columbus, NE

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        • #5
          Re: Removing Forms

          The forms also get harder to remove the longer they are left on. In normal concrete construction it is rare for vertical form work to be left on for more than a day, for horizontal form work more than a week. Concrete does not cure in a linear fashion. It hits better than 50% in 2 days and 80% in a week, with (nearly) 100% being reached in 28 days under ideal conditions.

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