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Mongo's 42" CT Build

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  • mongota
    replied
    (yawn)

    Finished the vent arch today. No "done" pics as I was in a rush to pick up my bride at the airport. But a couple of progress photos:

    Used the angle grinder to round over the bottom inside corners of the bricks that make up the flue entry. The corner bricks with the double round-over were a little tricky, But I just went at it freehand and they turned out fine.

    I can;t do anymore work until this weekend, hopefully then I'll get and flue anchor plate in place and get some blanket insulation in place.

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  • mongota
    replied
    Then on to the vent brick. I cut an "L" in the end of the vent bricks so they wrap around two sides of the dome arch brick, with the two runs of ceramic rope filling the gap between them. I back cut the end of each vent arch brick at a slight angle so only the inside edge of the vent arch brick touches the face of the dome arch brick.

    Originally I was going to just reply on compression to seal the rope between the two bricks. But I ended up running a bead of RTV on the two ceramic fiber ropes as I set each brick, that way I won't have to compress the rope as much. With less compression, It'll allow for more independent movement as the hot dome bricks expand and move next to the cooler vent brick.

    I cut and dry fit five courses of brick for each side of the vent arch today. I'll mortar them up tomorrow before lunch, let them sit for a few hours while I do other projects, then come back late afternoon and cut the brick for the rest of the vent arch. That's the plan at least. Anyhow, I'm glad I got a couple hours of work in today. Progress is always good.
    Last edited by mongota; 10-13-2020, 11:49 AM.

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  • mongota
    replied
    Work, weather, work, work, kids, procrastination, nappy time, etc. Anyhow...

    Three weeks later and I FINALLY started on the vent arch. I thoroughly wasted the last few days not working on this, but other things kept cropping up.

    Anyhow...I want to thermally and structurally isolate the vent arch from the fire brick dome. As we all know, the dome can see much higher temps than the vent, and differential expansion could lead to structural issues were they conjoined.

    The following is not a perfect way to do it...there will certainly still be some heat conduction from the dome brick to the vent brick. But I'm trying. The vent bricks will not be mortared to the dome bricks. The vent bricks will simply be butted up against the dome bricks, separated by a gap filled with two pieces of ceramic fiber rope.

    I bought some RTV high-temp silicon and some 1/2" ceramic fiber rope. I ran a couple of beads of silicon on the dome arch, one on the top of it and one on the face of it. Then I bedded the 1/2" ceramic fiber rope in the silicon.
    Last edited by mongota; 10-13-2020, 11:45 AM.

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  • thevance53@gmail.com
    replied
    Plug looks great. My remaining hole ios a little smaller and I was debating whether I do a larger two piece plug, but after seeing your method, I will try your way. I drew the pattern and started cutting bricks today. Hopefully I can plug the hole tomorrow, Thanks for posting the technique.

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  • JRPizza
    replied
    You are about 2 weeks ahead of where I was last year, as I plugged my dome Oct 9. With the shorter days and figuring out the vent my progress slowed. I was able to cut most of the arch bricks but didn't mortar them in till Spring. Hopefully the extra 2 weeks of daylight and your building skills will get you to the fire stage before the weather gets too cold. I've been living with my stucco rendered oven but want to put some sort of stone or tile over the igloo. Will be watching your build and looking for ideas to borrow from you for next spring.

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  • mongota
    replied
    Originally posted by JRPizza View Post
    Dome came out looking beautiful! Now for the next adventure, the vent and chimney
    Thanks.

    With the dome done, I sort of stood back for two minutes and admired it, then started laying out the vent.

    It'll be a week before I can cut brick again, but I'll try to knock the vent and the insulation out in the last few days of September. I'd like to do curing fires in late October.

    The thing I'm not looking forward to is the labor involved in mortaring up the stone igloo that's going to cover the insulation. I've built a lot of stone wall on my property. Some days you "see it" with stone, some days you don't. I don't have much of a warm fuzzy going in to this stone igloo. But if it comes out looking like I see it in my head, I'll be pretty darn happy.

    Going to order my anchor plate, chimney pipe and cap tonight. It should be delivered by the time I'm ready to work again.

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  • UtahBeehiver
    replied
    Nice job and brick work on the dome. LOL, like the comment about only 30 lbs worth fitting. Climbing in the dome is faint of heart.

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  • jonv
    replied
    Nice. Will be pleased if my own build looks as tidy! Great job on the plug.

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  • JRPizza
    replied
    Dome came out looking beautiful! Now for the next adventure, the vent and chimney

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  • mongota
    replied
    That'll be it for now. It'll be about a week before I get any more time to work on it.

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  • mongota
    replied
    The completed dome. Pretty messy with mortar shmears all over. I can only fit about 30lbs out of my 260lbs through the opening to clean it up, so I'll have to wait a bit on that.

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  • mongota
    replied
    Cut the plug. Wanted the inside face of the plug to be not more than 4" so when I beveled the sides outward, the other face would still fit the 4-1/2" width of a half-brick

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  • mongota
    replied
    Got the dome plugged yesterday.

    Made a template of the hole and then divided it onto eight sections to shape the eight brick for the last course. Sized the last course so the octagonal plug would not be more than 4" across. Then dry fit the last course.

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  • thevance53@gmail.com
    replied
    Slow down man, you are passing me up! Looking good. Those steeper angles are easier in some regards (don't have to level them as much), but they are much harder to keep everything fitting well and getting the joints filled all the way. Good luck. I hope to show you my plug this weekend.

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  • mongota
    replied
    Got two more courses done late today. Tomorrow will be the final course and the plug.

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