web analytics
Hearth Board Support - 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!

Forno Bravo
See more
See less

Hearth Board Support

  • Filter
  • Time
  • Show
Clear All
new posts

  • Hearth Board Support

    I am going to pour my hearth slab next weekend.

    I've read it both ways, but does anyone have an opinion on cutting the Hardibacker to fit just inside my wood form which would cover the cement blocks, or do I cut the Hardibacker so that it fits inside of the cement blocks and sits only on my wood frame (then remove it after pour)?


  • #2
    Re: Hearth Board Support

    I think the best plan is to have the cement board overlap the block stand a little, but not go to the edge, so your slab concrete can bond to the block stand.

    Putting the form inside the stand is for when you are using a wood form that will have to be removed.
    My geodesic oven project: part 1, part 2


    • #3
      Re: Hearth Board Support

      I used plywood under my stand (and removed it after). It was inside of my forms and sagged a little in the back corner. This meant that the slab is a little bit thicker in that back corner. Not a big deal, but certainly nothing to reccomend about tha approach. I like dmun's approach. Overlap a little and just leave it in there.

      My Oven Thread:


      • #4
        Re: Hearth Board Support

        I used Hardibacker, cut to fit within the blocks. Probably had around a dozen temporary vertical supports with 3 horizonal 2 x 4 "beams" as support. My plan was to leave the Hardibacker in place after knocking out the supports. 3 yrs later...the Hardi is still bonded in place. I give it a few taps everytime I pull logs from under there, still solid sounding, no signs of of loss of adhesion.

        I'd say, go with whichever way seems easiest as long as you have plenty of supports to eliminate sags or a collapse.