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pluscwc 08-08-2013 09:23 PM

~38" build in Seattle
3 Attachment(s)
Well, after many delays and much procrastination, I'm finally cutting bricks for the dome of my oven.
It's a little over 38" diameter, hemispherical dome, 19" x 11.5" opening.
4" of underfloor insulation, 2" of FB board and 2" of ins block-19.
I'm planning on using homebrew mortar. Thanks to deejayoh for giving me his leftover supplies last year.
The floor is cut from standard Mutual Materials firebrick, but for the walls I have slightly odd sized gray firebricks that were picked up off of craigslist from a residential fireplace dismantle. They are basically clean because the fireplace was constructed with two layers of bricks and I was the first one there to pick through the supply.
The plan right now is the enclosure will have a peaked roof, with an overly tall chimney, because the oven is located next to a covered outdoor space attached to the house.

I stacked the stand walls a couple of years ago. Then poured the hearth, installed floor insulation, and oven floor last fall, then mothballed the project until last weekend. I had weed seeds that sprouted in my oven floor.

As a side note, FB board and Insblok will mildew if left under a sheet of plastic all winter in the Pacific northwest. It's mostly dried out now, but I need to make sure it doesn't get soaked again if I don't have a roof on by fall.

pluscwc 08-08-2013 09:49 PM

Re: ~38" build in Seattle
2 Attachment(s)
I want advice on how far from the back to locate my oven opening.

I don't like spending too much time with CAD, since I use computers enough during the day.

Option A is closer to the center of the oven.
Option B is about a brick width further out.
I remember seeing variations of both of these. Is one better, easier to build, more stable? I am thinking A is too close to the center and I should recut my floor bricks to bring me back to B. (I was there, got convinced it wouldn't line up correctly and trimmed some of my floor off.)

I'm planning on having a thermal break, similar to deejayoh's.

Should the arch be deeper than the half-brick I'm currently showing?

texman 08-09-2013 06:45 AM

Re: ~38" build in Seattle

you want option a with more brick for the arch. You need the arch to protrude from the dome to support the back side of the vent. If your IT is set up correctly, the option A is correct and will be easier to build, more stable and appealing (IMO). Most builders use a 3/4 brick for the inner arch (i think). Check out my build and you will see that my inner arch did not protrude enough. I made it work (Gulf did really), but would have been easier to use 3/4 brick or full brick for inner arch. Octoforno set the bar on an option A build, check that one out, too. Look for Lee's treasure thread for many quality builds for reference of the many styles of domes out there. You have many options! Welcome aboard!:)

boerwarrior 08-09-2013 07:16 AM

Re: ~38" build in Seattle
I 100% agree with texman.
I built mine similar to your option "B". I wish I had gone with option "A". I ended up having to cut some filler pieces of firebrick to fill in the gaps between my dome and arch.

My oven works great but it was a PITA to do that work after I thought I was done with the dome.

deejayoh 08-09-2013 09:16 AM

Re: ~38" build in Seattle
1 Attachment(s)
Hmmm - I think you want somewhere in between. About an inch of brick sticking out from the dome at the bottom, and you will have 3 or 4 inch overhang at the top - especially if you are planning a heat break with an overlap like what I did. As Texman points out, you are going to want to use more than a 1/2 brick for the arch. If you cut the back of those away at an angle, you don't have to cut any filler pieces like Boerwarrior mentions.

Here's a shot of what I mean
Attachment 37994

BTW, Glad to see you've finally got going on the dome!

One observation - how far back is the opening of your dome from the edge of your hearth? Looks like a long reach. If I had one thing to change about my oven, I would have made the distance from the edge of the landing shorter. I think mine is about 23" IIRC from the edge of the landing to the edge of the dome floor.

texman 08-09-2013 09:36 AM

Re: ~38" build in Seattle
another point:

Remember that if you taper the arch brick (like Octoforno) that arch placement will change. The brick in your IT will be lower than your current pics and would change your setup by causing the arch to move outward/away from the center of the oven to line up like pic A.

pluscwc 08-09-2013 10:23 AM

Re: ~38" build in Seattle
Thanks for the advice. I guess I'll build a mockup with beveled arch bricks.

I need to measure how much the reach is. At this point I can still move it. I don't know how much the insulation has bonded to the hearth. Hopefully it won't cause too much damage. If I recall correctly, I was planning on a 12" ledge at the front, but I don't remember what the vent depth was. All of this will come back to me shortly.

pluscwc 08-09-2013 04:24 PM

Re: ~38" build in Seattle
OK, right now with the projected placement (A with longer bricks) above, I have about 21" from the forward edge of the entry arch to the front of the hearth. How much closer would you make it?

I need a small gap for a heat break, 11-12" for the vent, and a decorative front arch?

I'm quickly running out of landing, but I guess that makes sense.

deejayoh 08-10-2013 12:20 AM

Re: ~38" build in Seattle
Just measured mine, it is 24". 21" is probably good - but remember you are likely going to want your landing to extend beyond where your hearth currently ends, just for appearance. Mine extends 3" beyond at the center of the hearth.

I think you can do your vent in 9-10", and the landing doesn't really need to be that deep

pluscwc 08-10-2013 12:44 AM

Re: ~38" build in Seattle
Saw this from brickie in another thread.

"Underside of arch to intersect the underside of the dome no matter the size of oven or arch.
If you mess with 1 dimension you have to mess with the other."

Sounds like it's raining outside. I missed my opportunity to build a cover before things got wet again.

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