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The hearth questions and progress pictures

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  • The hearth questions and progress pictures

    I bought my material for the hearth. Both the insulating hearth and the structural. Can these both be poured the same day? Do I pour both the same size? The instructions say you can pour the insulating hearth smaller....how much smaller? Sorry for all the questions..


    Below I have started my pictures to show progress
    Picasa Web Albums - George - George T's Pi...
    Thanks,

    GT

    For all pictures of oven build click address.http://picasaweb.google.com/ghtaylo/GeorgeTSPizzaOven

  • #2
    Re: The hearth questions and progress pictures

    Yes, you can pout both layers at the same time. You would only make the insulating layer smaller if you want to attach your enclosure directly to the structural layer.

    Hope that helps,
    Drake
    My Oven Thread:
    http://www.fornobravo.com/forum/f8/d...-oven-633.html

    Comment


    • #3
      Re: The hearth questions and progress pictures

      Originally posted by DrakeRemoray View Post
      You would only make the insulating layer smaller if you want to attach your enclosure directly to the structural layer.
      ...which could be quite a good idea.

      The vermcrete insulation layer is a bit crumbly even when its dry, specially round the edges... so if you pour it and inch or two smaller than the structural hearth and then fill the gap with concrete (making a kind of concrete frame round the insulation), the exposed edges will be stronger. Or you can leave out the concrete edge as Drake said and build your enclosure directly on the structural hearth - that will also make it all a bit stronger.

      This is what I would do if I built another oven... but having said that, if it seems like too much messing about, your oven will work perfectly well if the insulation hearth and the structural hearth are the same size.
      "Building a Brick oven is the most fun anyone can have by themselves." (Terry Pratchett... slightly amended)

      http://www.fornobravo.com/forum/f8/p...pics-2610.html
      http://www.fornobravo.com/forum/f9/p...nues-2991.html

      Comment


      • #4
        Re: The hearth questions and progress pictures

        Hey George. My oven is still in progress (slow at the moment, I have company and it's been insanely hot here), so I can't tell you how wonderfully it works, but I have 4 inches of vermicrete on top of my structural layer (I used cove base as the form, worked pretty well) and 2 inches of insblock19 on top of that. I have left my form in place for now, since it is crumbly stuff, but I'm going to take it off when the dome is finished and then run a coat of either refractory concrete or the mortar over the whole thing to sort of tie it all in before I do the blanket/vermicrete coating. So, I have 6 inches of insulation under the thing total. You can see my pictures either on my link in this post or at my thread on this site- Elizabeth's oven.
        Elizabeth

        http://www.fornobravo.com/forum/f8/e...html#post41545

        Comment


        • #5
          Re: The hearth questions and progress pictures

          Thanks Elizabeth. I looked at your pictures the other day. Looks good. We did get our structural layer put in today....was hot and humid here today too. I plan to do my perlite and portland tomorrow I have noticed that some just pour it where the oven floor is. seems like a lot of work to build that form. But maybe it keeps it more level?

          I am a little concerned with how to really get the perlcrete good and level for the oven floor......I have wondered about putting some firebrick splits in the perlcrete like the picture in the Forno plans.....but that looks complicated too....

          arghhhh....
          Thanks,

          GT

          For all pictures of oven build click address.http://picasaweb.google.com/ghtaylo/GeorgeTSPizzaOven

          Comment


          • #6
            Re: The hearth questions and progress pictures

            Lots of pics.

            but check out my thread

            I built a form and poured the perlcrete where I thought my oven would be.
            My thread:
            http://www.fornobravo.com/forum/f8/d...ress-2476.html
            My costs:
            http://spreadsheets.google.com/pub?k...Xr0fvgxuh4s7Hw
            My pics:
            http://picasaweb.google.com/dawatsonator

            Comment


            • #7
              Re: The hearth questions and progress pictures

              Unless someone knows how I think it's pretty hard to get the perlcrete "level".

              Thats why I'm glad I got the FB board. I still used sand/fireclay (from cutting my bricks) to lever the board.

              I know some have used thinset of HS to create a level surface.

              Thanks
              Dick

              Comment


              • #8
                Re: The hearth questions and progress pictures

                Here's a pic of the perlcrete form...
                Attached Files
                My thread:
                http://www.fornobravo.com/forum/f8/d...ress-2476.html
                My costs:
                http://spreadsheets.google.com/pub?k...Xr0fvgxuh4s7Hw
                My pics:
                http://picasaweb.google.com/dawatsonator

                Comment


                • #9
                  Re: The hearth questions and progress pictures

                  Thanks Guys. I have looked at lots of pictures
                  First the FB board seems price at an insane price if I am understanding....I have a 42 inch oven and the directions say 4 pieces....$280 plus shipping.

                  I bought my perlite for $54 and two bags of portland $17 or total $71. I have seen some say it was almost the same price for FB board....but I could not see it.

                  Asudavew....do you think building the form was worth the time? What were the advantages from your perspective.

                  Thanks.
                  Thanks,

                  GT

                  For all pictures of oven build click address.http://picasaweb.google.com/ghtaylo/GeorgeTSPizzaOven

                  Comment


                  • #10
                    Re: The hearth questions and progress pictures

                    You've got me wondering too George. I keep reading these posts thinking why in the world would anyone want to mix concrete and vermiculite and "pour" another slab on to the one they just did when you could put the cement mixing equipment, trowels and forms away and just install 2 or 3 inches of FB board. Bu at an extra $200, I don't know. I think the FB board would save a lot of time and mixing fus and that is certainly worth something. Perhaps it depends on how easy to find and cheap the vermiculite or perlite is in your city. I'll be watching these posts to see what everyone thinks.
                    Good luck, my oven is still 2-3 months from starting.
                    Dino
                    "Life is a banquet and most poor sons-of-bitches are starving to death." -Auntie Mame

                    View My Picasa Web Album UPDATED oct
                    http://picasaweb.google.com/Dino747?feat=directlink


                    My Oven Costs Spreadsheet
                    http://spreadsheets.google.com/ccc?k...BF19875Rnp84Uw


                    My Oven Thread
                    http://www.fornobravo.com/forum/f8/d...arts-5883.html

                    Comment


                    • #11
                      Re: The hearth questions and progress pictures

                      Originally posted by George T View Post
                      Thanks Guys. I have looked at lots of pictures
                      First the FB board seems price at an insane price if I am understanding....I have a 42 inch oven and the directions say 4 pieces....$280 plus shipping.

                      I bought my perlite for $54 and two bags of portland $17 or total $71. I have seen some say it was almost the same price for FB board....but I could not see it.

                      Asudavew....do you think building the form was worth the time? What were the advantages from your perspective.

                      Thanks.
                      To me it was.
                      I didn't want the huge hearth... I like the three and a half inch hearth.
                      I have yet to finish it all out, but if I had a do over.. I would have taken more time curing. Cut the arch bricks for a really tight fit. And made the insulating layer 5.5 inches instead of 3.5

                      Hope this helps

                      Dave
                      My thread:
                      http://www.fornobravo.com/forum/f8/d...ress-2476.html
                      My costs:
                      http://spreadsheets.google.com/pub?k...Xr0fvgxuh4s7Hw
                      My pics:
                      http://picasaweb.google.com/dawatsonator

                      Comment


                      • #12
                        Re: The hearth questions and progress pictures

                        Dave, if you could do it over, would you still have used the perlite/concrete, or an insulation board?
                        Mike - Saginaw, MI

                        Picasa Web Album
                        My oven build thread

                        Comment


                        • #13
                          Re: The hearth questions and progress pictures

                          Originally posted by mfiore View Post
                          Dave, if you could do it over, would you still have used the perlite/concrete, or an insulation board?
                          THE more insulation the better.

                          Insulation board...that's how I would go..............I seem to lose heat from the hearth.

                          ie. So the tops cook fast... and the bottoms.. not so fast.

                          More insulation on the hearth is the way to go.

                          MORE>>> MORE>>> MORE

                          I don't think you can do to much on the bottom of you WFO
                          My thread:
                          http://www.fornobravo.com/forum/f8/d...ress-2476.html
                          My costs:
                          http://spreadsheets.google.com/pub?k...Xr0fvgxuh4s7Hw
                          My pics:
                          http://picasaweb.google.com/dawatsonator

                          Comment


                          • #14
                            Re: The hearth questions and progress pictures

                            Although I've not really had any issues, I will second Dave's comments. I too only used Vermiculete under the hearth - 4" in my case. Never an issue making pizza, but the next day when I am slow roasting or smoking - the variance between dome and hearth is usually about 50 degrees (the hearth being cooler). I think using the board or simply more verm. under the hearth would go a long way in having closer temps.

                            RT

                            Comment


                            • #15
                              Re: The hearth questions and progress pictures

                              I will also comment on the original question....if you can do both the structural and insulating pours on the same day, do it....I think you will have a better structure....keep it wet! (and only one cleanup event)

                              ....might also be good to have Daves form ready to place on the structural layer to make that second pour easier!

                              XJ
                              Sharing life's positives and loving the slow food lane

                              Comment

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