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How hot does entrance hearth get - Forno Bravo Forum: The Wood-Fired Oven Community

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How hot does entrance hearth get

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  • How hot does entrance hearth get

    How hot does entrance hearth get? Wondering about this because if it does get hot maybee we don't want it to get hot as it might be an area that if it had a insulation break between hearth floor and cooking floor then this entrance hearth wouldn't waste heat up time and it might make things more effecent. Why soak this area if we dont need the heat there? I have not seen one of these ovens in action although I am building one so still not real sure what gets hot and what doesn't. I understand that the vent above we want to get hot but maybee not the floor area. I myself have used the same mortar and brick treatment for this area as the rest of my dome construction so my question is only of the curious sort. Picture above is of round 8 completed today. ...... wayne
    Attached Files
    see below for my oven album of progress to date

    http://picasaweb.google.com/wayneber...PizzaOvenWorld

  • #2
    Re: How hot does entrance hearth get

    Wayne, I'm have no idea if we want it to or need it to, but mine does heat up quite a bit. The hearth area between the flue and and where the dome begins gets in excess of 400 degrees by the time the oven has burned white - ready for pizza.
    I've read that others have used this area to preheat logs (especially if the wood may be a bit green). All of the wood I've used has been pretty well seasoned, but not knowing any better on the first couple of big fires, I tried the preheat and those logs actually started to smolder within just a couple of minutes. you would actually have no problem cooking something at a slighty lower temp in this area.

    Comment


    • #3
      Re: How hot does entrance hearth get

      I think I read a thread somewhere which said that yes, you could insutate between the dome and the arch, and yes, you do loose heat there, but that it would be so complicated and the advantages (added heat retention) would be so small, that its really not worth the effort.
      "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: How hot does entrance hearth get

        That's the area we use to bake cookies after the pizzas are done....

        Christo
        My oven progress -
        http://www.fornobravo.com/forum/f8/c...cina-1227.html
        sigpic

        Comment


        • #5
          Re: How hot does entrance hearth get

          Originally posted by christo View Post
          That's the area we use to bake cookies after the pizzas are done....
          Ahh... So we definitely need that area hot!
          Ken H. - Kentucky
          42" Pompeii

          Pompeii Oven Construction Video Updated!

          Oven Thread ... Enclosure Thread
          Cost Spreadsheet ... Picasa Web Album

          Comment


          • #6
            Re: How hot does entrance hearth get

            I pondered that question when I was building mine. It is hard to have good seperation and still look good because you would have a large gap to get a really effective temp barrier.

            I decided to go with a subtle appraoch. At the first continuous horizontal seam in the entry, just outside the oven opening I cut the side of the brick at a 45 degree angle. So from the top the brick looks full size, but from the side you can see the lower long corner cut. I then painted some aluminum ceramic paint ITC-100 HT on the side of the cut brick and the side of the entry seam to reflect IR and finally placed the bricks with Perlite in the void created by cutting the brick. If you look at pictures of my entry you would never know anything special was done.

            I would not buy any ITC-100 again, it would not be worth it. I was planning to use over the entire dome, but it turned out that would not be a good idea. My treatment seems to be effective as with my IR gun I see almost a 200 deg difference across the seem.
            Wade Lively

            Comment


            • #7
              Re: How hot does entrance hearth get

              Wlively,

              Do you have a link to those pic's? They are not in the photo gallery.

              Thanks,

              Les...
              Check out my pictures here:
              http://www.fornobravo.com/forum/f8/les-build-4207.html

              If at first you don't succeed... Skydiving isn't for you.

              Comment


              • #8
                Re: How hot does entrance hearth get

                Originally posted by wlively View Post
                At the first continuous horizontal seam in the entry, just outside the oven opening I cut the side of the brick at a 45 degree angle. So from the top the brick looks full size, but from the side you can see the lower long corner cut. ... placed the bricks with Perlite in the void created by cutting the brick. If you look at pictures of my entry you would never know anything special was done.
                I have a plan that is nearly identical to Wade's (great minds think alike ). At the start of the vent landing, I am planning to cut a rabbet in the row of bricks on the "cold" side and fill the void with scrap insulation board (CalSil, SuperIsol, Kaowool, etc). The top of the seam will be mortared (as is Wade's) to hide the dirty little secret. A profile view is posted below.

                The more I think about it, Wade's 45deg angle cut may make the brick more resistant to breaking or cracking. I may steal your idea, Wade.
                Attached Files
                Ken H. - Kentucky
                42" Pompeii

                Pompeii Oven Construction Video Updated!

                Oven Thread ... Enclosure Thread
                Cost Spreadsheet ... Picasa Web Album

                Comment


                • #9
                  Re: How hot does entrance hearth get

                  Here's a minor improvement, and probably a bit closer to Wade's design:
                  Attached Files
                  Ken H. - Kentucky
                  42" Pompeii

                  Pompeii Oven Construction Video Updated!

                  Oven Thread ... Enclosure Thread
                  Cost Spreadsheet ... Picasa Web Album

                  Comment


                  • #10
                    Re: How hot does entrance hearth get

                    Ken - it looks like you already have some of the entry bricks laid, is that not the case? Anyway, this topic came a little late for me. I'm commited.

                    Les...
                    Check out my pictures here:
                    http://www.fornobravo.com/forum/f8/les-build-4207.html

                    If at first you don't succeed... Skydiving isn't for you.

                    Comment


                    • #11
                      Re: How hot does entrance hearth get

                      Les,

                      My entry bricks are not mortared yet, just sitting there. They are awaiting some trimming to allow for mortar joints.
                      Ken H. - Kentucky
                      42" Pompeii

                      Pompeii Oven Construction Video Updated!

                      Oven Thread ... Enclosure Thread
                      Cost Spreadsheet ... Picasa Web Album

                      Comment


                      • #12
                        Re: How hot does entrance hearth get

                        Ya'll going crazy on me?

                        Solid brick for me!

                        I've gone nuts enough already!!!
                        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


                        • #13
                          Re: How hot does entrance hearth get

                          Les

                          Sorry, I did not take any pictures of the cut or process. I was referring to the pictures of the landing were you can't see any difference. Ken has it right on with his drawing though. I took the 45 as far as I dared without damaging the upper or "show" corner.

                          Great drawing Ken and there is not such thing as "stealing" here, we are all simply "appropriating". Oh, and you are right about the mental thing!
                          Last edited by wlively; 10-24-2007, 12:41 PM.
                          Wade Lively

                          Comment


                          • #14
                            Re: How hot does entrance hearth get

                            Do you feel that there is that much heat thermally conducted from brick to brick to be an issue? My entire entry way is sitting on 4 inches of insulation board.

                            Les...
                            Check out my pictures here:
                            http://www.fornobravo.com/forum/f8/les-build-4207.html

                            If at first you don't succeed... Skydiving isn't for you.

                            Comment


                            • #15
                              Re: How hot does entrance hearth get

                              Les,

                              I sort of think this whole discussion may be more about splitting hairs then really helping efficiency . I'm sure there is going to be brick to brick conduction of heat, but I'll bet it is pretty minimal.
                              Ken H. - Kentucky
                              42" Pompeii

                              Pompeii Oven Construction Video Updated!

                              Oven Thread ... Enclosure Thread
                              Cost Spreadsheet ... Picasa Web Album

                              Comment

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