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Water vs. Fiber Board - 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.
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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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Water vs. Fiber Board

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  • Water vs. Fiber Board

    Been Lurking for some time now and I have finally jumped in and started my build. For the record I am building a 38" WFO. Block base is done and the 3 1/2" structural hearth is complete. My plan is to use the 2" Fiber Board for the insulating hearth, which I now have 3 sheets from FB. And this is where my question comes in.
    Since I live in Iowa the weather changes every 10 min. If I put down the Fiber Board then begin building my floor on top of that, what happens to the FB when it rains?
    Will the water start to deteriorate the FB? Do I need to work under a tent and keep the elements off the build until I have everything completely enclosed?
    My other thought would be to encapsulate the FB with a thin layer of vermiculate and concrete mixture. Good idea or not??
    Thanks in advance to any and all suggestions.

  • #2

    I've read where many of our members have had their insulation wet with no long term down side, it just makes curing the oven a bit more tedious as you get rid of the moisture slowly so as not to harm the oven.

    Many members here put a cover of some kind over their oven as they build, both for heat relief and to keep the oven as dry as possible during construction.
    Lee B.
    DFW area, Texas, USA

    If you are thinking about building a brick oven, my advice is Here.
    Our One Meter Pompeii Oven album is here.
    An album showing our Thermal Breaks is Here.

    I try to learn from my mistakes, and from yours when you give me a heads up.


    • #3
      Re: Water vs. Fiber Board

      encapsulate the FB with a thin layer of vermiculate and concrete mixture. Good idea or not??
      Not. Vermiculite concrete is even more water absorbent than refractory insulation.

      Proceed with your build. Your board will not deteriorate to any appreciable extent with moisture.
      My geodesic oven project: part 1, part 2


      • #4
        Re: Water vs. Fiber Board

        I would either opt for the pop up tent/canopy (they can be had for around $100 or so), or simply use a tarp.
        I think it just makes sense to keep out the elements until you get things buttoned up, regardless what specific materials are used.
        Do not expose vermiculite concrete to rain or excessive water, unless you enjoy portland cement flavored oatmeal.



        • #5
          Re: Water vs. Fiber Board

          I intentionally left some of the product exposed under weight over the winter (rain and snow). It survived. I also posted a pic of my truck on top of a piece - this stuff is pretty much bullet proof.. As others have said, keep it dry if you can.
          Check out my pictures here:

          If at first you don't succeed... Skydiving isn't for you.


          • #6
            Re: Water vs. Fiber Board

            This my friends is the advice I have been looking for. Thanks so much for everyone's input. My intent is to move forward with a POP up tent and then stake it to the ground so that it can remain up until the build is complete. Pizza by the end of the Summer!!


            • #7
              Re: Water vs. Fiber Board

              If you want that tent to stay put for a while take 4 Concrete blocks and put a leg into the hole of each one. Then pour concrete in each of the holes around the leg it will take quite a wind to move the tent after that and you do not need to avoid the tie down straps provided with the tent. if you want it to really stay put you can ram a piece of rebar in the ground in the same concreted hole and the canvas will blow away before the legs come off the ground.



              • #8
                Re: Water vs. Fiber Board


                Heidi here from Forno Bravo, the FB board needs to stay dry, I would recommend using a tent while building the oven. If you have any questions please feel free to contact me at 1-800-407-5119 ext 14.



                • #9
                  Re: Water vs. Fiber Board

                  Isnt the FB board from Forno Bravo a Calcium Silicate board?
                  This shouldnt be too bad if slight moisture gets on it. Ceramic fiber wiuld be worse.


                  • #10
                    Re: Water vs. Fiber Board

                    Johnny, key word to your post is slight. tferin lives in Iowa - tornado alley. They can get baseball sized hale storms. I stand by my original post, COVER IT!



                    • #11
                      Re: Water vs. Fiber Board

                      In that situation, build a barn over it!!!!!!!!!!!!!