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Bacterium's 2nd build

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  • Re: Bacterium's 2nd build

    Mostly the mortar but it cracked all the way through one brick...bit surprising because it occurred in an area where I had a good bond, no aligning joints. Looking closer tonight there are a couple other spots. I guess being second hand bricks it was always a risk.

    Happy if others want to provide comment on best mix for a capping layer over dome (before blanket) . This would also provide a less jagged surface for the blanket to go onto anyway.
    Cheers
    Damon

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    • Re: Bacterium's 2nd build

      Damon

      IM Going To Use Shiralite.

      Then Blanket.

      Won't be curing mine until blanket ss on - Something To Do With Hear Balance
      Last edited by oasiscdm; 05-20-2013, 06:12 AM.
      Cheers Colin

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      • Re: Bacterium's 2nd build

        What's Shoreline?...... You got me there.
        Cheers
        Damon

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        • Re: Bacterium's 2nd build

          Sorry Damon bloody mobile phone autocorrect.

          Shiralite
          Cheers Colin

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          • Re: Bacterium's 2nd build

            Better to use a dense mix over the dome that will provide some extra thermal mass and strength IMO. Shiralite is an insulator. You are better to use your best insulator closest to the heat. For that cladding layer I use aggregate, sand, cement, lime and steel fibres for strength, but chicken wire will do too.
            Kindled with zeal and fired with passion.

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            • Re: Bacterium's 2nd build

              Cheers Colin.....I struggle with that on the iPad as its different to android on my phone.

              David thanks, after more reading last night this confirms my direction. .....might stick some remaining heat proof mortar on the cracks then chicken wire then this smoothing and thermal mass layer.......you would think it would help keep the dome integral/strong.
              Last edited by Bacterium; 05-20-2013, 06:04 PM. Reason: Annoying iPad spelling
              Cheers
              Damon

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              • Re: Bacterium's 2nd build

                Originally posted by Bacterium View Post
                Ouch....
                The crack fairy visited last night.....
                Ya probably need a totally new description for cracks appearing in the oven........
                The English language was invented by people who couldnt spell.

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                • Re: Bacterium's 2nd build

                  Are hair line cracks a big deal? And won't most ovens get them? Or not?
                  My build. http://www.fornobravo.com/forum/f51/...ton-18665.html

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                  • Re: Bacterium's 2nd build

                    All ovens crack to some degree.
                    The English language was invented by people who couldnt spell.

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                    • Re: Bacterium's 2nd build

                      hi

                      here here Alan, I was talking to a Furnace builder [30years in industry]today and he confirmed what you posted.

                      Comments made were along the lines of - Every oven is unique and not having cracks is what is rare. But the tips were - complete your oven without sealing it i.e. cement based render not acrylic, Then cure it very slowly. this will give you the best chance toward crack minimization.
                      Last edited by oasiscdm; 05-21-2013, 05:46 AM.
                      Cheers Colin

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                      • Re: Bacterium's 2nd build

                        It's actually safer to drive out the moisture before rendering it.
                        Kindled with zeal and fired with passion.

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                        • Re: Bacterium's 2nd build

                          Why?

                          David am only reporting what I was told by a commercial refractory builder. Same source re using the shirilite first prior to blanket. One of the points in doing this first revolves around ceramic blanket fibers getting through cracks, as I believe in Europe they have banned ceramic blanket due to carcinogenic issues now using superwool.
                          Last edited by oasiscdm; 05-21-2013, 04:38 AM.
                          Cheers Colin

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                          • Re: Bacterium's 2nd build

                            Ok, I take your point. It is possible that some fibres could find their way through cracks in the dome with all the expansion and contraction going on there could be some abrasion to the blankets surface. I don't use blanket at all, mainly because of the cloud over its safety. I work in a school and we are not allowed to use ceramic blanket any more because of its greater risk to young people.the water soluble stuff is safe, but more expensive. I stick to perlite and vermiculite which I can obtain locally and it's relatively safe.

                            My comment re safer to drive out the water prior to rendering relates to steam pressure causing outer shell cracks.
                            Last edited by david s; 05-21-2013, 04:47 AM.
                            Kindled with zeal and fired with passion.

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                            • Re: Bacterium's 2nd build

                              With a small vent like cobblerdave and others have used would that not prevent that? Thus Creating a point of least resistance for steam to escape thus protecting the outer shell.
                              Last edited by oasiscdm; 05-21-2013, 05:44 AM.
                              Cheers Colin

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                              • Re: Bacterium's 2nd build

                                The pathway for the steam, through the insulatin layer is fairly restricted before it even reaches the vent so a lot of water can still crack the outer shell. A vent works pretty well but can't release large volumes if they suddenly turn to steam. Especially if you have a thick vermicrete layer, that whole layer can expand considerably. It is better to eliminate the water as much as possible before rendering the outer shell, otherwise you tend to lock in moisture.
                                Kindled with zeal and fired with passion.

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