web analytics
could I use these in place of the second floor slab? - Forno Bravo Forum: The Wood-Fired Oven Community



New Forno Bravo Forum Feature

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.
- 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.

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!

Forno Bravo
See more
See less

could I use these in place of the second floor slab?

  • Filter
  • Time
  • Show
Clear All
new posts

  • could I use these in place of the second floor slab?

    Ceramic Kiln Fire Brick K-23 IFB

    K-23 straight IFBs (Insulating Fire Brick) 9"x4.5"x2.5"

    I have heard a lot of people complain about insufficient insulation in the floor. I see these insulating firebricks for sale locally. Could I pour the normal 3" slab for the floor, then build the next layer out of these firebricks, before laying down the conducting firebricks for the oven? Skip the vermicrete / FB board and just use IFBs for that entire section?

    Is this a good deal @ $2/piece?

  • #2
    Re: could I use these in place of the second floor slab?

    you could use them, although I think you'd want to maybe lay them on edge. Check the ratings, I think IFB is less effective as an insulator than CF board, so you'll want more than 2.5".

    $2 each is a good price for IFB, but how many of them does it take to make up the same area as a sheet of CF board? That's the price comparison I'd do. Check the prices of CF board at McGill's Warehouse.
    My build progress
    My WFO Journal on Facebook
    My dome spreadsheet calculator


    • #3
      Re: could I use these in place of the second floor slab?

      I looked up IFB properties and found thermal conductivity on the order of 0.3 W/mK. Forno Bravo board claims 0.13 W/mK. So yes IFB is slightly less but I think when you get below 1 W/mK it's a great insulator and you're splitting hairs to measure it out to two decimal points. Anyone have a # for 4:1 or 5:1 vermicrete?