web analytics
Insulating slab premix? - 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

Insulating slab premix?

  • Filter
  • Time
  • Show
Clear All
new posts

  • Insulating slab premix?

    Hi all, I have some premix left over (4-5 bags) from my reinforced slab pour, before I begin on my insulating slab, I was wondering if I could use the premix and perlite/vermiculite to create the slab, or will the sand and stone take away from the insulation properties.

  • #2
    Re: Insulating slab premix?


    You are correct in your assumption that is will reduce the efficiency of the insulation.

    All you want in the vermiculite (5 parts) and pure cement/concrete (never knew the right term).. in 1 part.

    one little tip if i may,

    presoak the vermiculite in water.. this will make your life a whole lot easier.


    • #3
      Re: Insulating slab premix?

      Pure Portland Cement is the correct term,

      Concrete is the mixture of Portland Cement/sand/and rock - sometimes a little lime is added.


      • #4
        Re: Insulating slab premix?

        Thanks Mrchipster for clarifying.. I always get them the wrong way around.


        • #5
          Re: Insulating slab premix?

          Appreciate the fast replys, Ill pick up a bag of portland.


          • #6
            Re: Insulating slab premix?

            I was able to mix and pour it today. I wet the perlite first, and then dumped it into my mortar tub, added the portland and mixed well, then added some more water and mixed again. I then put it into the form and check for level. It was actually real easy to do, no stress and adding the water to the perlite first helped the portland coat it better.
            Thanks all for the help.


            • #7
              Re: Insulating slab premix?

              Glad to hear it all worked out ok.. wetting defintately makes a world of difference.

              I dry mixed it on a cement mixer.. man was that a bad idea.. All that happens is the vermiclite/perlite sucks the water from the cement and turns it rock hard..



              • #8
                Re: Insulating slab premix?

                Ill post some as soon as I pull the forms. I got a mouth full of dust when I was pouring out a bag, the water seemed to keep the dust down nicely.