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Rockwool for hearth insulation - 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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Rockwool for hearth insulation

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  • Rockwool for hearth insulation

    Hello,

    I am new to this forum and starting my WFO build.

    I would like to know if this can be used for hearth insulation http://www.knaufinsulation-process-s...eb-1213-UK.pdf

    it is rated up to 700 C / 1300 F

    Thanks, Gorazd

  • #2
    Re: Rockwool for hearth insulation

    Rock wool is not quite as good an insulator as calcium silicate board, but it's cheaper.i've used rock wool blanket but it has the reputation of being extremely water absorbent, although I notice your product claims to be water resistant, they probably have treated it with something. The main thing I'd be concerned about is its strength. Will it be strong enough to withstand the weight of an oven built on top of it without compressing?
    Most builders go for calcium silicate board under the floor or if you want a cheaper way of doing it cast your own vermicrete slab using a 5:1 ratio.vermiculite, cement.
    Last edited by david s; 04-03-2014, 01:13 PM.
    Kindled with zeal and fired with passion.

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    • #3
      Re: Rockwool for hearth insulation

      I haven't seen rock wool insulation that comes in boards. I could only find rock wool blankets. Good for you to find one. I agree with david s. I think that Vermiculite or Perlite in the ratio 5:1 with cement would be cheaper and better than the rock wool board. I even had several weeks delay in my build looking for hearth insulation. If I find one I'll be done in a week or two.
      Why is this thus? What is the reason for this thusness?
      I forgot who said that.

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      • #4
        Re: Rockwool for hearth insulation

        Thanks for your inputs. I finaly found some specs about load bearing properties and it is not going to work. High temp board has compression strength of only 250Pa, normal rockwool board is 2MPa.

        Gorazd

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