Perth 42" Pompeii - dome to flat entry integration

[jab49]

Re: Perth 42" Pompeii - dome to flat entry integration

I'm baaackk! Slow progress here in Willetton, but have had a knee operation so have some form of excuse. Have made lots of errors but it's coming together. Tomorrow I have hired a brick saw - the angle grinder only goes so far.
Probably have to rethink my formwork for the remaining courses. I cut it ok, but instead of leaning the bricks directly on it, used wedges, so now, there's a gap between it and the bricks. If I'm consistent, it will now be a nice, round and slightly bigger dome. Might be able to just lift up the foam formwork into the remaining section, we'll see.

[Cheesesteak]

Re: Perth 42" Pompeii - dome to flat entry integration

"but will it get worse as I go higher,"

Eventually you will have to start "beveling" the bricks to keep the joint tighter at the bottom.

Yup - not that hard. Some people create jigs for the angle cuts - I just put one of the brick shims I cut out under the brick I was cutting (to get the bevel) - just played it by ear (so to speak) and beveled the sides. As I got higher - I angled the bricks (on the shims) for the double bevel cut. This gives you plenty of brick shim / scraps to use for filler pieces in the larger gaps . . .

Like I said - I just eyeballed them and they came out pretty tight . . .



Keep going - you'll do fine. Just take a couple of bricks and shave off the bevel and see how they fit together. Once you see it - the rest should be easy.

[Neil2]

Re: Perth 42" Pompeii - dome to flat entry integration

"but will it get worse as I go higher,"

Eventually you will have to start "beveling" the bricks to keep the joint tighter at the bottom.

[jab49]

Re: Perth 42" Pompeii - Gaps in brickwork

How critical is it that the faces of the bricks all but up against each other? In this photo, you see little gap opening up. I'm thinking that it' won't matter too much, but will it get worse as I go higher, and if it must sort it out now, how would that be achieved?

[MumsOven]

Re: Perth 42" Pompeii - dome to flat entry integration

Hi John

I Built my oven a few years ago - the arch is not as difficult as you may think.
I'm not a brickie or stonemason - give it a go.

Look at my link - this may give you some ideas

[Mike D]

Re: Perth 42" Pompeii - dome to flat entry integration

Just use your indispensable tool to check if your dome will connect with your arch. If it doesn't reach correctly than you will end up with a teardrop like some of us have. The arch has to be pushed far enough into the oven to make a good connection.
- I had this problem in my build, you can check it out if you want.(round shape)

Good luck,
Mike

[Amac]

Re: Perth 42" Pompeii - dome to flat entry integration

JT

Not sure if you have used Silaset 40D, but not having worked with it before, I wanted to check it wasn't one of the products that the manual cautions against using (that are designed for indoor fireplaces).

If I remember rightly it was airset mortars they cautioned against whcih is not what you are using.
Still some people use airset and it seems to work Ok. I think as long as the dome is covered from rain (tarp or something - you seem to have a roof of some sort) even the indoor.
stuff will be OK. It was the expense which finally turned me off the airset and I opted instead for the homebrew - which is widely recommended on here and I heartily endorse.
The arch will be fine. If you have 12" radius semicircle (as I think Cheesesteaks was) the dome should hit it consistently all the way round.
As brickie says once, the dome is built around it it will reinforce it from all sides - wait till then before you do the Sharkey test
That reminds me have to post my pic of the "jig on the dome"
looking good so far - keep it going
Amac

[jab49]

Re: Perth 42" Pompeii - dome to flat entry integration

Carry on with the build, the dome will buttress the arch and stop it from moving further.

Thanks Brickie. Sometimes one needs a little gentle encouragement to keep going.

Can I ask that you take a look at another post I just made, back in the Materials threads?

http://www.fornobravo.com/forum/44/resources-west-australia-13379-2.html

Not sure if you have used Silaset 40D, but not having worked with it before, I wanted to check it wasn't one of the products that the manual cautions against using (that are designed for indoor fireplaces).

Cheers

JT

[brickie in oz]

Re: Perth 42" Pompeii - dome to flat entry integration

Carry on with the build, the dome will buttress the arch and stop it from moving further.

[jab49]

Re: Perth 42" Pompeii - dome to flat entry integration

Sorry, accidentally deleted my post, that didn't have pictures, so here's it again, in summary:

This may be the dodgiest build on the forum, but I have built an inner arch and first course. Note the many and varied mistakes - one could spend hours picking them out! Any resemblance to Cheesesteak's oven is purely coincidental, therefore! Before I move on, is there any reason to redo this arch? I'm not going to stand on it, that's for sure, but when is near enough good enough? Appreciate the mentoring to get me this far (originally it was going to be a flat entry and angle iron, remember?), but don't be shy in any advice or counselling you may care to give (such as "quit while you're ahead ... ha ha).

[brickie in oz]

Re: Perth 42" Pompeii - dome to flat entry integration

We need pictures......

[Cheesesteak]

Re: Perth 42" Pompeii - dome to flat entry integration

Hi Cheesesteak

I like what you have done (I like the other approaches too, but yours looks simpler and easier to me). Can I check a couple of things with you?
1. Confirm that you have just used standard half bricks on the dome (no tapering)?
2. When you said that "each chain finished itself", what do you mean?
3. Any chance you can let me know the dimensions of your arch span, height and dome diameter?
4. The top of your arch - looks like two bricks set the other way in orientation - correct?
5. Did you draw out this arch on paper first or just lay it out in trial?

Thanks in anticipation!

Regards

John

John -

1. On the arch - as you can see - I tapered every other brick or so. I did taper some when I moved up the dome. Just the sides - not top and bottom.

2. What I mean is that I started each chain in the back of the dome and worked towards the arch. They "finished themselves" because I was just left with a gap to fill. I cut a "v" in the last brick and they wrapped around the arch. It was quite a bit easier than I thought it would be.

3. Here's how I located the arch: http://www.fornobravo.com/forum/f8/l...tml#post111827
Again, this was much easier than I thought it would be. I just intersected a 12" radius arch into a 42" dome. The numbers don't lie . . . I drew a line 4 1/2" back from the outside radius of the dome and built my arch on that line. Everything else fell in to place.

4. Yes.

5. All I did was draw it out in the link in my #3 above.

[jab49]

Re: Perth 42" Pompeii - dome to flat entry integration

I built my arch first (on top of the floor) and then built my dome and just cut each brick where it intercepted the dome. If you place the arch in the correct spot - the end bricks in each chain will "wrap" the arch (each end brick of mine was cut in a "v" shape).

The arch was quite simple and each chain finished itself. No calculations, no compound miter cuts for me. It's certainly not as pretty as some of the arch / dome transitions you'll see - but it works just fine and I don't have any cracks or mortar issues to speak of.

Here are a couple of pictures . . .







Do what you're comfortable with - but I'd really suggest building the arch and not using angle iron. There's a ton of information here - and folks have built these things so many different ways and most, if not all, work just fine.

Hi Cheesesteak

I like what you have done (I like the other approaches too, but yours looks simpler and easier to me). Can I check a couple of things with you?
1. Confirm that you have just used standard half bricks on the dome (no tapering)?
2. When you said that "each chain finished itself", what do you mean?
3. Any chance you can let me know the dimensions of your arch span, height and dome diameter?
4. The top of your arch - looks like two bricks set the other way in orientation - correct?
5. Did you draw out this arch on paper first or just lay it out in trial?

Thanks in anticipation!

Regards

John

[Amac]

Re: Perth 42" Pompeii - dome to flat entry integration

If you want a semicircular (or near) arch, it will tie into the dome nicely - look at Giannifocaccias, KarangiDudes, Aceves and Sharkeys. I based mine on theirs because the dome walls attach with a straight cut and also the arch inside has the same convex shape as the dome inside (no ash traps)
I used a variation where I was able to cut all the arch bricks identically in advance and built the arch first. I too thought I would not have the skills to do it but it worked out really well, and much easier than I expected.
see post #36

http://www.fornobravo.com/forum/8/39-stargate-pompeii-17334-4.html

I hated the idea of angle iron also - but I am sure there are lots of working ovens with angle iron framed entries
Good luck
Amac

[Cheesesteak]

Re: Perth 42" Pompeii - dome to flat entry integration

I built my arch first (on top of the floor) and then built my dome and just cut each brick where it intercepted the dome. If you place the arch in the correct spot - the end bricks in each chain will "wrap" the arch (each end brick of mine was cut in a "v" shape).

The arch was quite simple and each chain finished itself. No calculations, no compound miter cuts for me. It's certainly not as pretty as some of the arch / dome transitions you'll see - but it works just fine and I don't have any cracks or mortar issues to speak of.

Here are a couple of pictures . . .







Do what you're comfortable with - but I'd really suggest building the arch and not using angle iron. There's a ton of information here - and folks have built these things so many different ways and most, if not all, work just fine.