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Pouring hearth - Forno Bravo Forum: The Wood-Fired Oven Community

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Pouring hearth

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  • Pouring hearth

    Next week I'm starting the base and hearth installation for my Casa 110. In looking at the designs provided here on the site I have a question about how to pour the hearth once the masonry base is in place. How do you keep the concrete from flowing down into the openings in the bricks? The plywood forms seem to create the hearth base at the level of the top of the bricks, but since not all bricks are filled with concrete/rebar, won't concrete flow into the remaining openings?

  • #2
    Re: Pouring hearth

    you have several options

    stuff the voids with the empty cement bags (not an option unless your mixing and pouring the concrete youself) or any other scraps laying around.

    I chose the expensive route - went to Home Depot and bought 'tin caps' that are made for this specific purpose. The cost was 11 cents each, so for less than a buck you can cap them the right way.

    RT

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    • #3
      Re: Pouring hearth

      I think the old version of the plans specified using a roll of aluminum flashing to prevent this.
      My Oven Thread:
      http://www.fornobravo.com/forum/f8/d...-oven-633.html

      Comment


      • #4
        Re: Pouring hearth

        Newspaper, broken pieces of block, mortar slobbers, concrete slobbers, tar paper, paper grocery bags, also work just fine..
        If you are using redi mix the slump shouldn't be that high anyway as to "flow" through any of these. If you are mixing by hand use the bags and with the first batch you mix top off the webs so it sets up a bit while you are mixing the rest of the slab.
        Keep in mind the wetter you make concrete the weaker it gets and the more shrinkage/cracks you get.
        Last edited by Unofornaio; 06-20-2007, 11:38 PM.
        http://www.palmisanoconcrete.com

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        • #5
          Re: Pouring hearth

          My family made a "time capsule" and put that down one of the holes. Of course, it might not be discovered for a loooong time!
          "You better cut the pizza in four pieces because I'm not hungry enough to eat six."

          -- Yogi Berra

          Forno Tito

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          • #6
            Re: Pouring hearth

            We did the same thing..My daughter at the time was 7 and this was great fun for her. I think it should be s.o.p. for building an oven kinda like an offering for the Pizza Gods shhhh..dont tell my mom I said "Pizza Gods" I'll have to listen to an hour long lecture something about no other gods before you (Roman Catholic ya got to love it.) anyway lets face it these things are gonna be here long after we are gone..
            http://www.palmisanoconcrete.com

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            • #7
              Re: Pouring hearth

              Uno,

              Here in Ontario at least, it was traditional for 19th century masons to bury a bottle somewhere after their work was done. I have a hand blown whiskey bottle I found in the front of the house because of this tradition. I've put all kinds of things into the walls of my house and parts of the oven: coins, newspapers, bottles, notes. Why not? Should be fun for the people who might find them one day.

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

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              • #8
                Re: Pouring hearth

                If you are thinking for the long-run, you could do what the Italians do, and place a Madona. Karma insurance? :-)

                The idea behind the flashing was in case the concrete ever got hot enough for a slip plane (Jim H was being very thorough), but that would never happen. I always use the concrete bags.
                James
                Pizza Ovens
                Outdoor Fireplaces

                Comment


                • #9
                  Re: Pouring hearth

                  I think I'll go all the way with this stuff on my next oven...one of each of these items and cover all bases. I couldn't say pizza god in front of my mother either, RC too...she be saying the rosary for me forever. The Greeks, Vikings and other european seafarers used to put coins into the keels of their ships as an offering to their god of the sea, Poseidon etc.. Interesting traditions.
                  Best
                  Dutch
                  "Making the simple complicated is commonplace; making the complicated simple, awesomely simple, that's creativity. " Charles Mingus
                  "Build at least two brick ovens...one to make all the mistakes on and the other to be just like you dreamed of!" Dutch

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                  • #10
                    Re: Pouring hearth

                    You can see the stand and hearth pour photos (and some limited documentation) here: supercub : photos : Building a Wood Oven - powered by SmugMug

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                    • #11
                      Re: Pouring hearth

                      Looking good! I like the idea at supercub : photos : Building a Wood Oven - powered by SmugMug of using plastic wire ties to keep the rebar together, and easier I suspect than bending up short lengths of wire.

                      Good to see at supercub : photos : Building a Wood Oven - powered by SmugMug that you used tensioned wires to keep the forms from bowing out – no tripping over angled props during the slab pour!

                      Your decorative layer looks great – I look forward to seeing it completed.

                      Paul.

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                      • #12
                        Re: Pouring hearth

                        i did my hearth a little differnt than most on top of the last course of 8 inch block i laid a course of 4 inch block flush with the out side of the 8". then i put wonder board on the shelf created on the inside notched the wonder board where i wanted the hearth pour to flow vertical . put temp bracing in two places under the wonder board . bent and tied my vertcal rods to the horizontal grid and filled er up worked super . no forms to strip on perimeter . no forms to strip under except two braces under wonder board we use this system all the time on chimneys in houses . really enjoy this forum
                        dave d
                        Last edited by dave d pizza lover; 07-15-2007, 06:07 AM.

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                        • #13
                          Re: Pouring hearth

                          dave d pizza lover:
                          "notched the wonder board where i wanted the hearth pour to flow vertical"
                          Dave,

                          This sounds like a great idea. By "flow vertical" do you mean flow down through the blocks?

                          Thanks.

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