Texman Build

[texman]

Re: Texman Build

That really helps, Thanks! The fog is clearing a bit.

[deejayoh]

Re: Texman Build

This may be a crazy way to show it - but here's how I did it. Think of the top shape as being square, not round. You can fill in the corners with brick triangles once you get it to a square shape.

What I did was to narrow the long sides of my vent from 10.5 inches to the 8 inches using the first course of bricks. Then I broadened the short side from 5.5 inches to 8 inches on the next. Then I went in with a grinder and smoothed everything out to make it more even.

To finish it, I put a cap of splits on that was cut to a round shape and screwed the anchor plate to that

[texman]

Re: Texman Build

Tracy - that looks fantastic! You should be really, really pleased with how well that came out. Thanks! After doing it twice, no doubt. Only regrets, so far, are the potato chips as Tscar called them. Oh well.

On the height thing, I think it's inevitable when using an IT. It's just math. The oven height will be the length of the IT + the distance of the pivot from the floor. So I am guessing you had a 18 3/4" long IT with a pivot that was 3/4" from the floor. How am I doing so far? right on. before i started, i drew the offset and thought it would cause the dome to be slightly lower because of offset. I think it might have, but at the last 2-3 courses i followed the curve of dome and didn't use the IT.

On the flue - 7" sounds right to me. I went with 8" on a 39" oven. Given the height of your chimney, you'll have some sticker shock when it comes to buying the vent pipe. I had the best luck buying from build.com. Free shipping and 5% off coupon. no kiddin' (holy cow)

On the vent opening, mine was 5.5" x 10" into an 8" flue. 4" x 12 would probably work for you - but the tricky part is maintaining the area while turning that rectangle into a circle. Think about how you'll make that happen. You might want to go 5 x 10.

the base plate for a 7" duratech triple wall is 12" x 12". I was thinking my depth of the vent should be at least the same as interior pipe, so 7", which would be a 7"deep x 12" wide and require a brick and a 1/2. But as i read around, that doesnt seem to hold true. But, how do go from say a 5" depth to a 7" pipe opening? I have looked at Aidan, sharky, Karangi, ken's kentucky, Tu dat, Yours, and many more. (probably should be working) Anyway, i will keep looking trying to understand that part. I saw you mention somewhere about builders making a transition to the bigger pipe when the depth of the vent is less than the pipe. Do you concave the brick to pipe size? Can you explain that?
Tracy

[Amac]

Re: Texman Build

I was looking at your vent. I really like it. is the draw ok? I am glad to be thinking about something besides the dome.

At start up there is smoke - but sporadic - seems like a windy day affects it. Having said that almost every (fine) day is a windy day here. When the fire is well lit there is no smoke and it draws really well. I copied the idea from Sharkey but he had 12" long bricks which meant he could make the vent deeper - like 6" or so. I made mine 1/2 a 9" brick which makes the vent narrow. I couldn't figure, or buy, a flue to fit so I made a flue from scrap copper, to fit the vent I have. I am posting a few pics over on my own thread today, which shows my first attempt at stucco and the chimney.
To do that vent you should taper the vent arch bricks and after about 4 bricks up on each side I cut the tapered bricks in half and one half continues the arch. The other half are turned over and it starts an S shape. Just keep building until it flattens - you might need to skim some off to get it flat at the top. You might find that 4.5" is too narrow for your vent, but I think I would do exactly the same if I was doing another dome.

[deejayoh]

Re: Texman Build

Tracy - that looks fantastic! You should be really, really pleased with how well that came out.

On the height thing, I think it's inevitable when using an IT. It's just math. The oven height will be the length of the IT + the distance of the pivot from the floor. So I am guessing you had a 18 3/4" long IT with a pivot that was 3/4" from the floor. How am I doing so far?

On the flue - 7" sounds right to me. I went with 8" on a 39" oven. Given the height of your chimney, you'll have some sticker shock when it comes to buying the vent pipe. I had the best luck buying from build.com. Free shipping and 5% off coupon.

On the vent opening, mine was 5.5" x 10" into an 8" flue. 4" x 12 would probably work for you - but the tricky part is maintaining the area while turning that rectangle into a circle. Think about how you'll make that happen. You might want to go 5 x 10.

[Gulf]

Re: Texman Build

The build is looking great Tracey,
I'd go with the triplewall since it is attached to your home. It might even be a building code or insurance requirement.

[flyfisherx]

Re: Texman Build

Congratulations on the dome closure Tracy! It looks very nice. I hope to be there someday.......

[texman]

Re: Texman Build

Looking at chimney pipe. They make a 7" which feels about right for this oven.
Also, there is single, double and triple wall? Any thoughts on which to use? i would think at least double for me, since it passes through a ceiling. But what about triple? Overkill?
FB plans say "Flue sizing depends on such local conditions as prevailing
wind, height of chimney, proximity of taller, nearby
structures, etc. A good rule of thumb is to choose a flue that
has an area of about 3-4 times the door height. Depending
on what is nearby, you may need a taller chimney."
My door height is 12", so an area of 36-48 sq inches looks like. That seems small, only say 12"x4". Is that the size of the bottom of the flue and then it channels to the actual opening at top?
More decisions.

[texman]

Re: Texman Build

Great finale, nice layout in final courses and plug. I see the math paid off.

The math helped, i would say. I still had to cut a "custom" brick to close. In hindsight, i think that doing the math and getting uniform bricks, and then "custom cuts" is the way i would go. The math assumes a perfect circle or at least uniform size bricks in the previous course. I don't know how to calculate that imperfection. Just glad the dome is finished. Hopefully no nightmares of a dome in pieces. That was a lot of work.
Thank you for the compliment. Your build looks great, keep up the good work.
Tracy

[UtahBeehiver]

Re: Texman Build

Great finale, nice layout in final courses and plug. I see the math paid off.

[texman]

Re: Texman Build

Amac,
My wife doesn't think she likes the igloo and i know nothing about stucco. You would think that i would be past any intimidation of building products at this point. I haven't had the time to show her some pics of those yet. When i started this, i thought the enclosure was better because you could insulate more and hold the heat better, but i know when done correctly the igloo is an efficient choice as well. Still undecided...

I was looking at your vent. I really like it. is the draw ok? I am glad to be thinking about something besides the dome. Thanks for your help and checking in. I appreciate it.
Tracy

[Amac]

Re: Texman Build

That looks really brilliant Tracy - especially the "flower" finsish in Pic2.

Still trying to finalize enclosure plans, probably be a framed concrete board scenario.

If I had built in an enclosed space like you I would definitely go for an "igloo" finish. I am doing that anyway with an option to build an enclosure later if I get problems.

Did you write off that idea for a reason - or just personal preference?

[texman]

Re: Texman Build

Dome is closed! Happy with the results. This is a very difficult project, but very rewarding. I am so glad to have the dome finished. The IT and base are out. Cut the pressboard with a circular saw set very carefully and then broke the board to get it out. Glad to see the floor again. The oven is still dirty, but apparently fire will take care of that or should it be cleaned?

I need advice on the vent. My oven is 37.5" with a 19.5" dome height. (not sure how that happened) 18" inch inner arch wide with a 12" height. I am thinking a 6" flue unless the forum thinks otherwise. I will have a tall chimney since my oven is in a covered area, so draw will be improved from the height.

Still trying to finalize enclosure plans, probably be a framed concrete board scenario.
Tracy

[texman]

Re: Texman Build

i think i am gonna cut another course and then the plug. Seems like the other way is gonna be more difficult and might cause some different stress than the normal close w/ plug. it is just another 10 bricks or so. My back is getting tired from bending over the dome and ducking under the roof. It has been over a 100 degree everday and 95 at 9 oclock in the evening. just need to take my time and close it right.

[deejayoh]

Re: Texman Build

Tracy -
I tried that sort of closing on my dome. I hope you have better luck than I did, as I couldn't get it to work. I ended using small pie wedgs, which I found worked much more easily

I also did the *exact* same thing as you with the cardboard on the string!