#21  
Old 05-18-2013, 12:39 PM
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Default Re: How to build chimney and outer arch

That's a lot of reinforcement KB! Earthquake proof
I dug out and filled with about 150-200mm of hardcore, then put in a 150mm slab reinforced with 10mm bar and some mesh. I've then come up 4 courses of cavity blocks and shuttered and poured an arch in the front. I currently have the deck shuttered to pour the hearth slab(more correctly sub-slab I suppose)
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  #22  
Old 05-19-2013, 06:38 PM
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Default Re: How to build chimney and outer arch

No earth quakes in Florida. Hurricanes and sinkholes I know it’s a bit over kill, but I had some concerns after cutting the pool deck, I found quite a large void beneath the pool deck. Sure it was only settlement of the original installation. I don’t know if the news about the man being swallow up by the sink hole here in Florida made it to Ireland, but how tragic, I had night mares of my WFO also being swallowed up………I mainly thought if there was any addition settlement the It could cause issues for a full brick chimney.


Ok I will try to finish the explanation of my foundation and hearth and hopefully get the discussion going on how to build the brick chimney.
After blocks brought to hearth level, 1/2” Hardee board was laid and support was built to facilitate 3½“concrete pour. Rebar was set on 8” x 8” centers and forms were built for monolithic arch. Rebar tied all together overlapped. I wish I would have extended pour over block courses. Pictures attached:

Will this support any size chimney?.................Inner arch will be complete soon...........Outer will be self-supporting with thermal break???????????? Where do we go from here?
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How to build chimney and outer arch-sspx0057.jpg   How to build chimney and outer arch-sspx0060.jpg   How to build chimney and outer arch-sspx0067.jpg   How to build chimney and outer arch-sspx0081.jpg   How to build chimney and outer arch-sspx0196.jpg  

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Old 05-19-2013, 11:01 PM
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Default Re: How to build chimney and outer arch

Gudday KB
Forno oven stand is grossly over built to start with and yours in the true tradition is also! My own stand carries 170 odd firebricks and 200 odd house bricks in the dome and chimney.no worries.
Regards dave
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Old 05-20-2013, 12:53 AM
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Default Re: How to build chimney and outer arch

Looks excellent kb, perfect form work. My own arch bellied slightly in the front doorway so ill probably have to reshape part if it with a consaw. I assume its ok to pour the 3.5" slab with no airgap as it'll be we'll insulated from the actual hearth? My original build was from 'The Breadbuilders' book and the slab was part of the hearth so required an airgap. Now that I'm sitting a prebuilt dome and hearth on 4.5" vermicrete above the slab I suppose I don't need an airgap? Any thoughts in that?
Also, can I put fibre blanket down and pour the vermicrete onto it or would that make any sense?

Btw, I think I did actually hear about that guy that went down the sinkhole, it was quite a while ago wasn't it?

Last edited by RichC; 05-20-2013 at 12:56 AM.
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Old 05-30-2013, 07:52 PM
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Default Re: How to build chimney and outer arch

Quote:
Originally Posted by RichC View Post
Looks excellent kb, perfect form work.

Btw, I think I did actually hear about that guy that went down the sinkhole, it was quite a while ago wasn't it?
Yes that was quite a while ago. Tragic

Hows the chimney build coming?
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Old 05-31-2013, 05:09 PM
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Default Re: How to build chimney and outer arch

Still working on deck so chimney is in planning phase
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Old 06-01-2013, 06:54 AM
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Default Re: How to build chimney and outer arch

Are you going to incorparate a thermal break between the chimney and oven?
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  #28  
Old 06-01-2013, 07:16 AM
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Default Re: How to build chimney and outer arch

By thermal break do you mean insulating layer? Hadn't thought about it. What's the pros and cons?
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Old 06-01-2013, 02:01 PM
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Default Re: How to build chimney and outer arch

A thermal break is an engineered gap between the adjoining oven arch and the entryway arch. The purpose of this break is to minimize the contact area between the two structures in order to limit the amount of residual oven heat loss through the entryway once pizza oven temps have concluded.
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Old 06-01-2013, 02:37 PM
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Default Re: How to build chimney and outer arch

I hadnt considered it Gianni! Is it worth considering?
See attached image of the kit that I'm using. I'm thinking of using the chimney structure they provide which is 3 section thing with a cutout for the flue in the top section. How would you go about building a thermal break into that?
I've been consdiering building a brick chimney but I might just go ahead with the parts in the image. The sections in the image bond to the dome with refractory mortar? What do you think?

Thanks

Richard
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