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Bacterium's 2nd build

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  • Bacterium
    replied
    Re: Bacterium's 2nd build

    Davids,
    Thanks. Yes I will use vermicrete to relevel on top of blanket, rather the using render to get final shape

    So would a layer of vermicrete under blanket afford a protection layer under blanket....eg. risk of inhaling CF fibers getting through potential cracks, to inside of oven
    Or would people see this as unlikely (CF doesn't break down like that ).

    Sorry if this sounds paranoid......on my last build I was only days away from finishing dome that I asked about underfloor insulation...... I Tend to ask more questions this time around.

    Leave a comment:


  • david s
    replied
    Re: Bacterium's 2nd build

    The CF could be dangerous to inhale rather than to ingest.
    The blanket is relatively dense and does not compress if rendered over, but it will be lumpy where there are folds and joins so rather than using tons of render you can get the shape back to spherical with vermicrete then render over it, but there's nothing stopping you from just adding more and more coats of render until you get the form you're after. If doing it this way each subsequent layer of render should be weaker (ie less cement more lime) than the previous coat.
    Last edited by david s; 05-29-2013, 11:34 PM. Reason: Clarification

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  • Bacterium
    replied
    Re: Bacterium's 2nd build

    Thanks Colin.


    Ok guys I'm still undecided......Instead of shiralite, could one do vermicrete (say 20mm) above and below the blanket.

    My questions being...
    Do you need to make it safe between oven dome and blanket, so no CF ends up inside oven.
    And
    To minimise blanket compression, do you need vermiculite between outer render/stucco and blanket?

    ......!!

    Leave a comment:


  • oasiscdm
    replied
    Re: Bacterium's 2nd build

    Hey Damon

    Have PM'd you.

    Leave a comment:


  • oasiscdm
    replied
    Re: Bacterium's 2nd build

    Originally posted by Laurentius View Post
    To the Ozzies,

    Please correct me if I'm wrong. Is there some among you guys? I really hope not, but lately I feel that it has become a little hard edged. Maybe, I'm too sensitive. Just asking.

    Nope, Just Some Discussion About What Should Go Where To Prevent This And That, With A few Differing Views Here And There. All Good Information. Sometimes Debates Happen. But I Know I Got Some Good Info, LiKE Now I Expect My Oven To crack. So I Won't Be disappointed Now When It does

    Leave a comment:


  • david s
    replied
    Re: Bacterium's 2nd build

    Originally posted by Laurentius View Post
    To the Ozzies,

    Please correct me if I'm wrong. Is there some high tension among you guys? I really hope not, but lately I feel that it has become a little hard edged. Maybe, I'm too sensitive. Just asking.
    To which posts are you referring?

    Leave a comment:


  • david s
    replied
    Re: Bacterium's 2nd build

    Originally posted by Bacterium View Post
    No problem guys, keep going its highlighted things to consider.

    I finished adding my extra layer on dome ( aggregate/sand/cement/lime +chicken wire). How long should I let it dry (as a minimum) before I redo curing fires (drive out moisture)?
    I like to leave it for a week, not for strength but to allow the water to escape, assuming the weather is fine. Tarp it if it looks like rain.

    Leave a comment:


  • Laurentius
    replied
    Re: Bacterium's 2nd build

    To the Ozzies,

    Please correct me if I'm wrong. Is there some high tension among you guys? I really hope not, but lately I feel that it has become a little hard edged. Maybe, I'm too sensitive. Just asking.

    Leave a comment:


  • Bacterium
    replied
    Re: Bacterium's 2nd build

    No problem guys, keep going its highlighted things to consider.

    I finished adding my extra layer on dome ( aggregate/sand/cement/lime +chicken wire). How long should I let it dry (as a minimum) before I redo curing fires (drive out moisture)?

    Leave a comment:


  • oasiscdm
    replied
    Re: Bacterium's 2nd build

    Sounds like a good plan David.

    Sorry Damon I didn't intend hijacking your thread.

    Leave a comment:


  • david s
    replied
    Re: Bacterium's 2nd build

    Colin,
    I think your plan is ok for the reasons you stated, but if it were me I'd be firing the oven after a week of hopefully rainless weather after applying the Shiralite. It will take lots of water. After applying the blanket over the dried Siralite you might find the surface pretty bumpy with blanket folds and joins. A thin layer of the Shiralite or vermicrete will get it back to anice hemisphere again prior to rendering.

    Good luck,
    Dave

    Leave a comment:


  • oasiscdm
    replied
    Re: Bacterium's 2nd build

    Yes I know it will but am hoping less so. proof of pudding will be in the firing

    Leave a comment:


  • brickie in oz
    replied
    Re: Bacterium's 2nd build

    Originally posted by oasiscdm View Post

    I keep reading about expansion and contraction and with a single layer of dome bricks I just feel locking that in place with an outer shell before the blanket cant hurt one bit.
    It will still crack and so will the outer concrete shell.

    Leave a comment:


  • oasiscdm
    replied
    Re: Bacterium's 2nd build

    Hi guys

    I have seen it [shiralite]in pics and examples and it looks ok to me Allan quite insulative and solid. Not like I have seen with vermiculate alone.

    However I will be using it for previous reasons stated with a ceramic blankie over it.

    Part of my reasoning to do this, instead of maybe having another thermal mass layer over it [the dome], is to simply create a lock or key to lock the dome in place and add a bit more insulation. A blanket CANNOT DO THAT but actually places a layer over the dome that allows greater movement of the dome bricks that are held together by a little mortar [that must be the weak point as cracks seem to occur predominantly in the mortar]. The blanket I assume can also be susceptible to compression occurring would possibly lose some insulative properties due to this.

    I keep reading about expansion and contraction and with a single layer of dome bricks I just feel locking that in place with an outer shell [whether thermal mass or solid insulation layer] before the blanket cant hurt one bit. I'm no scientist or refractory expert but to me this makes perfect sense. Solid layer vs moveable blanket layer vs solid insulative layer around the dome sorry will go with either of the solid optins first every time. Must help a little with crack minimization also.

    Just a theory but that's what I'm going to do.

    If it fails then you can all tell me I told you so
    Last edited by oasiscdm; 05-28-2013, 04:52 AM.

    Leave a comment:


  • brickie in oz
    replied
    Re: Bacterium's 2nd build

    If it one of them high temp refractory so called insulators then forget it, Ive used a similar product and its just useless.

    Stick with vermiculite or cf blanket.

    Leave a comment:

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