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Mongo's 42" CT Build

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  • mongota
    replied
    Something certainly happened, because im full! Lol

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  • WarEagle90
    replied
    No pics? Didn't happen . Sounds like a great meal, Mongo. I especially like the roasted peaches and nilla ice cream, mmmm, mmmmm, good.

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  • mongota
    replied
    Whelp, the first WFO meal was tonight, but no pics! It wasn't really planned, it just happened. Roast chicken, plus roasted asparagus and onions. Picked a few peaches off the trees, sliced them up and put them in the oven for about 10 minutes, then served them over vanilla ice cream for desert. Pretty darn bueno.

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  • mongota
    replied
    I appreciate the kind words, thanks Lee!

    I'm going to let the shell rest a bit, next up I think I'll come up with a plan for the decorative front arch and vent assembly. I'll probably end up casting a decorative front arch, two side pieces (one for each side of the vent arch), and a cap for the top of the vent arch that the chimney stove pipe will pass through.

    I might try to take a photo of the front of the oven and convert it to a line drawing via photoshop. Then try out some sketches on that drawing to see if I can get reasonably pleasing proportions.

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  • Lburou
    replied
    Mongo, your build shows exceptional conceptional planning and remarkable details. Well done!

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  • mongota
    replied
    Second coat of Thoroseal. Added a little carbon black colorant.

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  • mongota
    replied
    Got home last night after a few days being out of town, so today was the day to get the first coat of Thoroseal on the dome. Painted it on, worked it into the surface, then back brushed it. Really helped to wet the dome first to minimize the Thoroseal siezing on the dry shell.

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  • mongota
    replied
    Thanks.

    I have it covered with a concrete curing blanket. It's a burlap and poly blanket. Not perfect, as the blanket doesn't conform perfectly well to the compound curves of the dome shape. But it helps hold the moisture in. when I pull the blanket off to re-wet the dome, it's still a bit damp.

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  • david s
    replied
    Misting the surface thenconcrete strength on curing letting it dry again is not actually a good way to cure it. Concrete really requires constant humidity or wetting for the curing to work properly. Covering it with plastic is a better way to hold the moisture in constantly. Having said that, they guys who render houses never cover their work or even wet it down and the stuff doesn’t fall off. You’ll be fine.

    concrete strength on curing
    https://www.quora.com/What-is-the-mi...ement-concrete
    Last edited by david s; 07-21-2018, 12:21 AM.

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  • mongota
    replied
    Only took one day of misting the stucco shell to encourage me to dig around in the basement so I could up-size from the 16oz hand-held spray bottle that I used while building the brick dome to the 2-1/2 gallon garden sprayer. lol

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  • mongota
    replied
    Originally posted by ASPLM View Post
    How long are you going to let the stucco cure before your next fire?
    I'm giving the stucco a week, actually 8 days, of cure before I waterproof it with a couple coats of Thoroseal. I'll then give the Thoroseal a few days to cure/dry before I run another fire.

    Over the course of the current 8-day cure, the shell is being misted down several times a day. If I was not doing Thoroseal, I'd not have a problem firing the oven after those 8 days. I'd start with a low fire and after a couple hours I'd check the stucco shell for excessive warmth, with the warmth indicating moisture. If the stucco remained fairly cool, then I'd have no problem running a hot fire.

    One thing to note is that the stucco shell is not my finished exterior surface. If it was, I'd have probably done a 3-coat application. I'll be covering the stucco shell with a dome of mortared stone. The stone, I have plenty of it from my property. My plan is to decouple (gap) the stone dome from the stucco dome so structurally and thermally they will be independent of one another.
    Last edited by mongota; 07-20-2018, 01:21 PM. Reason: spellling

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  • ASPLM
    replied
    How long are you going to let the stucco cure before your next fire?

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  • mongota
    replied
    Originally posted by Gulf View Post
    Mongo,

    That is the best insulation job that I have seen. Great job!
    Looks like a snow igloo under the hot summer sun. Lol

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  • MichaelPBoisvert
    replied
    Originally posted by mongota View Post

    Michael, I used roughly 3-1/4 rolls, the rolls were 8# density, 2' x 25', 50sqft per roll.

    When it came time to calculate the amount of insulation needed I had a 21" interior radius dome, but that dome was sitting on top of a 4" thickness of board insulation and a 2-1/4" thick floor brick.

    So to calculate the surface area of my dome, I used the vertical radius of my dome versus the horizontal radius. From the slab the dome is built on measuring vertical, I calculated the radius by adding 4" of board insulation + 2-1/4" floor brick thickness + 21" interior dome radius + 4-1/2" dome wall thickness + 2", with that 2" simply being a point 50% of the way through the thickness of the eventual blanket insulation. A total radius of 33-3/4", which gives a surface area of 50sqft.

    I knew going in that the 50sqft number was a generous number, because my first layer was going to sit on top of the 4" of board insulation, plus there was the vent arch which took away from the surface area of the dome that I needed to cover. And my dome doesn't honestly have a 33-3/4" radius. Geometrically, it's less than that as it's more like a half-sphere sitting on a section of cylinder.

    So I bought four boxes, a total of 200sqft, and used roughly 3-1/4 to 3-1/3 boxes. I used the wedge-shaped off-cuts from covering the dome to cover the vent arch. They all knit together quite well.


    This is very healpful! thank you. Looking great BTW! Very clean.

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  • UtahBeehiver
    replied
    You are really making up for lost time.

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