web analytics
mortar and insulation mistakes-help? - Forno Bravo Forum: The Wood-Fired Oven Community


1 of 3 < >

Forum Page Loading Response

Forum Members:

We have received feedback regarding recent issues with page loading response time. We believe the slow response issue stems from the analytics we added with the new Forum. We are in the process of reconfiguring those elements and, after an approximate 24-hour time period for the reconfiguration to run, we anticipate a return to normal page load times. Thank you for your patience!
2 of 3 < >


Hello, Forno Bravo Community Forum members.

As many may have noticed already, the Community Forum site was briefly down today. While working on scheduled routine maintenance, we encountered an error when trying to add a software update. As the site is now back up and running, some of you may notice that some recent data has been misplaced from November 10th up to today. We are currently working on resolving the issue. The forum has full operational capabilities and we encourage all forum members to continue actively posting in the threads.

We apologize for any inconvenience that this issue may have caused you. The Forno Bravo family values each and every member of our community. If you have any issues or concerns, please feel free to let us know on our issues thread here:


Thank you for understanding.
3 of 3 < >

Forno Bravo Forum Thread Message

Hello, Forno Bravo Community Forum Members!

The Forno Bravo team has heard the feedback in regards to the community forum. We wanted to take the time to re-enforce our commitment to a fully engaged Forum with professional moderation.

Our top priority as a company is to fix all forum errors and issues that you are experiencing. As we are swiftly working on these problems, we want to say that we highly value the Forum Bravo Community Forum and every single community forum member.

We have set up this thread so that every member can address any concerns, issues and questions about the forum. Please feel free to ask whatever you would like in regards to the forum; let us know what issues you are experiencing so we can work on resolving them as fast as possible. However, we stress that we would like constructive engagement, so please be specific about the issue you are experiencing.

Thank you for all of your patience and continued support.

Link to topic: http://www.fornobravo.com/community/...with-new-forum
See more
See less

mortar and insulation mistakes-help?

  • Filter
  • Time
  • Show
Clear All
new posts

  • mortar and insulation mistakes-help?

    I'm disappointed today to discover that my insulating hearth of vermiculite-concrete turned out to be 3" not 4". I don't know why I didn't check this before we went on to the dome, but the dome is done now.

    How much will this affect the oven temps?

    We grouted the interior gaps with the fireclay-portland cement-lime recipe, which I think was a mistake, was it?

    And finally, I have a 36" interior dome, will two layers of FB blanket be enough insulation on the dome, with stucco on top of the blanket?


  • #2
    Re: mortar and insulation mistakes-help?

    Hi Connie,

    Oooops on the vermiculite concrete. I think it will be fine -- you might lose a little heat out the bottom, but nothing serious. Nothing to worry about.

    Try to make sure you do enough overlaps with the FB Blanket where you get 3" around the dome. Two boxes should do that on a 36" oven. If it is tight on material, make the insulation thicker on top of the oven than on the sides.

    You'll be fine!
    Pizza Ovens
    Outdoor Fireplaces


    • #3
      Re: mortar and insulation mistakes-help?

      Thanks for the answer James. I did order two boxes. If there are any scraps I will lay them on top.

      What do you think about the mortar inside the dome, is it ok that we grouted the inside?

      One more question, do you know where to get a temperature gauge to install?

      Thanks for all the great advise, I have spent hours and hours reading all the postings in the forum and looking at photos.

      I will post some of my photos too.


      • #4
        Re: mortar and insulation mistakes-help?

        I have tried to attach some thumbnails of my progress so far. We are getting excited about this project. Should be finished in a week and will post more photos.
        Attached Files


        • #5
          Re: mortar and insulation mistakes-help?

          Hi Connie,

          Your oven looks great. Way to go.

          Mortar inside the dome is fine -- some builders like to keep it nice and clean, as you do see the brickwork when the oven dome goes clear when it is fully fired. Your call. But joints facing into the oven are fine.

          Are you installing one thermocouple of two?

          This is a good question -- particularly if you are installing just one. What does everyone thing. 2" in from the inside face of the cooking floor, or the dome at the apex?

          If you are doing two, then I would go for those two spots.

          Are folks happy with setting the thermocouples 2" back from the face of the oven?

          Last edited by james; 10-08-2008, 04:01 PM.
          Pizza Ovens
          Outdoor Fireplaces


          • #6
            Re: mortar and insulation mistakes-help?

            How is the thermocouple installed?
            Is it drilled into the brick or can it be mortared in the gaps?



            • #7
              Re: mortar and insulation mistakes-help?

              I don't even have a thermocouple yet and I don't know where to get them. Can I drill a small hole to install them before I apply the insulation? Should I use some mortar to close the gap or some furnace sealant?



              • #8
                Re: mortar and insulation mistakes-help?

                James, et al,

                I installed mine to within 1 inch of the cooking floor, same for the dome. The wires should be drilled into the brick from the back. You can seal the holes with mortar or furnace cement in a tube (same gun as window caulking). Go to Sensors, Thermocouple, PLC, Operator Interface, Data Acquisition, RTD to find out about thermocouples and order online. No affiliation with those guys, though; it's just a convenient spot. Alternately, find a pottery/kiln supplier in your area.

                "Made are tools, and born are hands"--William Blake, 1757-1827


                • #9
                  Re: mortar and insulation mistakes-help?

                  Connie, you should probably be aware of the other temperature gauging options. The thermocouples are somewhat expensive and then you'll also need something to "read" them (something to display the temperature), so it could end up costing at least $200+. And you'll need to route the wires.

                  Another option is a simple self-standing dial thermometer, but that will only gauge the air temp where it's sitting, and you'll need one that reads up to 1,100+ degrees F. And another option is an infrared thermometer, which looks like a gun that you point into the oven when you want to gauge the surface temperature. Many folks on this forum use nothing but an IR thermometer, since you can point it wherever you want. FornoBravo sells a nice one. You can also find models that are a combination IR thermometer and thermocouple reader in one.

                  But the only way to gauge the internal temp of your bricks is with a thermocouple. These can be placed in the floor bricks, in the air within the dome, in the dome bricks, outside the dome bricks (under the insulation), etc. Hope that helps.

                  Yes, you can drill a small hole to install them, or insert them into a layer of mortar between bricks. If the hole is tight, I don't think there's a need to mortar them in place.
                  Picasa web album
                  Oven-building thread


                  • #10
                    Re: mortar and insulation mistakes-help?

                    You can buy high quality refractory mortar for setting firebricks www.refractorymortars.com or www.vitcas.com