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  #61  
Old 07-26-2013, 01:08 AM
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Default Re: 42 inch Pompeii build i Norway

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Originally Posted by brickie in oz View Post
You need some shims underneath the arch support legs otherwise you wont be able to get the arch profile out once the arch is built.
Thanks Al I remember that. This was just a mockup to see what the radius could look like. I was waiting for the last ingredient for my homebrew (lime) to arrive and needed something to do
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  #62  
Old 07-26-2013, 01:40 AM
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Default Re: 42 inch Pompeii build i Norway

Check out this website for arch buttressing.

Auroville Earth Institute
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  #63  
Old 07-26-2013, 02:34 AM
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Default Re: 42 inch Pompeii build i Norway

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Originally Posted by brickie in oz View Post
Check out this website for arch buttressing.

Auroville Earth Institute
Think I should go for a tighter radius in my arch? the radius now is 119 cm. Like I said earlier my bricks are tapered for this radius. It looks scary flat.
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  #64  
Old 07-26-2013, 02:59 AM
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Default Re: 42 inch Pompeii build i Norway

All arches want to push out and lay straight, a flat arch even more so.
You need to compensate for the outward forces some how.
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  #65  
Old 07-26-2013, 08:34 AM
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Default Re: 42 inch Pompeii build i Norway

I think you will be fine with a "scary flat' arch.

I buttressed my outer arch with angle iron as shown in the attached. I'm not sure it was necessary but it gave me piece of mind and my oven is working beautifully and the small cracks I have have not gotten any bigger in the last 2 months of heavy use.
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42 inch Pompeii build i Norway-angle-iron-buttress.jpg  
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  #66  
Old 07-27-2013, 12:16 AM
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Default Re: 42 inch Pompeii build i Norway

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Originally Posted by boerwarrior View Post
I think you will be fine with a "scary flat' arch.

I buttressed my outer arch with angle iron as shown in the attached. I'm not sure it was necessary but it gave me piece of mind and my oven is working beautifully and the small cracks I have have not gotten any bigger in the last 2 months of heavy use.
I still have a while before I decide "How low I can go".
I may chicken out and go for smaller radius just so I can sleep at night

I have all the materials needed for home brew so now I can start making it look like an oven.
I felt I did not need a layer of sand/clay under the floor bricks as slab was very smooth and level.
I'll be using homebrew 1,1,1,3 or 1,1,1,4 and the first course will not be mortared to the floor.

Anything else I should keep in mind laying the first two courses?
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42 inch Pompeii build i Norway-img_0093.jpg   42 inch Pompeii build i Norway-img_0095.jpg  

Last edited by Steellearning; 07-27-2013 at 12:25 AM.
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  #67  
Old 07-27-2013, 05:22 AM
Apprentice
 
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Default Re: 42 inch Pompeii build i Norway

3/1/1/1 sand fireclay lime Portland
Keep a good circle 1st 2 are easy
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  #68  
Old 07-27-2013, 09:25 AM
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Default Re: 42 inch Pompeii build i Norway

Tried to mortar a few bricks and I'm having problems keeping the joints small.
The mortar compresses really fast with the small amounts I was hoping to use and I don't feel like there's a uniform bond though out the joints.
Any advise? Should try adding more water to my mix?
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  #69  
Old 05-31-2014, 02:07 AM
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Default Re: 42 inch Pompeii build i Norway

I'm back...
Cut a few bricks this week and now I can work on my arch. Not really looking forward to this part of the build but it has to be done
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42 inch Pompeii build i Norway-img_4722.jpg   42 inch Pompeii build i Norway-img_4723.jpg  
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  #70  
Old 06-23-2014, 10:50 PM
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Default Re: 42 inch Pompeii build i Norway

It's starting look like a sphere... and bricks are getting more difficult to lay. May have to use a gym ball soon.
I'm hoping to close it up this week so that I can start to work on my external arch.
I've found a source for perlite in Porgrunn, here in Norway. Thanks to some math help here on the forum I figure I'll need 2 x 200 ltr. bags of the stuff to insulate my dome. If I can't find ceramic blanket I'll be using Rockwool under the perlite.
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42 inch Pompeii build i Norway-ovenimg_4748.jpg   42 inch Pompeii build i Norway-ovenimg_4736.jpg  
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