Pdx 42" update

[Macrinehart]

Might even be more like 1.5" wide inside dome.

Well noted. I was busy marking up my bricks with a 2" outer bottom width, which results is a 1.7" inner bottom width. I got your point though. I will attempt the feathering as suggested. I wonder if I should take the angle grinder to the inside edge of the dome to round off some of my sharper angles on the 10th course for a tighter fit?

(It seems like a good idea, but I suppose I worry about messing things up. Maybe instead I should dry fit the next course and take off somw sharp edges for a tighter fit to the existing inside top edge of rank 10)

[Macrinehart]

I decided to experiment with one piece. Not sure on the results. On the positive side it fits very tight to the place its intended for. But the angle cut on the inner face means the bottom depth is reduced which causes the outside bottom to be recessed about a quarter inch inside the outer curve of the dome. Not sure if that is an issue?

[UtahBeehiver]

That should work and luckily you do not really have that many to do. You really only need the do the conflicting area (inner dome area) say the first 1 1/2-2" and let mortar fill in the back side. IMHO, use the brick you bought.

[Macrinehart]

This might be the weekend that I close the dome...

I'm about to head out, but before I do - I have a few questions on the outer arch, flue and chimney. With a 42" oven, I'm planning on 8" chimney (stainless steel), which has an opening area of about 78 sq inches. My plan is to have a rectangle opening in the outer arch, about 5.5" x 12", and to fabricate a custom flue transition. That leaves 3.5" of brick to work with around the front and/or back of the throat/opening. This presumes the depth of my outer outer arch is 9".

I also have 7/8" fiberglass rope gasket that I planned to use to seal between the inner and outer arches to allow some space for the dome to move.

Before I start cutting bricks for the outer arch, I want to verify this approach to the chimney opening is sound. Also, I'd like to know if I should have these very shallow arches in front and behind the flue transition? Or perhaps I should extend the depth of the outer arch with an additional course of bricks? Or maybe go for a wider opening, such as 5" x 16"?

Thanks for the advice!

Mac

[Macrinehart]

Well - I had to let the motar set up on my 11th course, so I jumped to the opening arch and just dove in I decided to put the 3.5" arch on the outside, with the throat to the chimney going back to the inner arch. I figure I can use the fiberglass rope gasket to help seal the inside arch, and I'll get some thinner rope gasket material to help get a good seal on the custom transition to the chimney. I think it looks pretty good.

[david s]

The outer arch needs to have a bigger radius and the vertical bricks supporting it about an inch wider, creating a rebate so a door will fit against the inner arch.
Here's an example of a stainless fabricated transition.

[Macrinehart]

Hi David - well noted, and I have the rebate per your guidance, my outer arch bricks are cut lengthwise so the outer arch has less depth than the inner arch to create the reveal.

[Macrinehart]

Here is the outer arch with my form removed. Some of the lower bricks were tilted incorrectly, which I fixed as I was approaching the top of the arch. But looking at it now I'm thinking about taking it appart and redoing things between bricks 4 and 14.

Update: I was showing off the oven to my dad and he used the opening arch as a handhold and accidentally pulled it apart. So I guess that settles the matter; I'm rebuilding the opening arch.