42 inch Pompeii build i Norway

[Steellearning]

Re: 42 inch Pompeii build i Norway

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

[brickie in oz]

Re: 42 inch Pompeii build i Norway

Check out this website for arch buttressing.

Auroville Earth Institute

[Steellearning]

Re: 42 inch Pompeii build i Norway

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.

[brickie in oz]

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.

[boerwarrior]

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.

[Steellearning]

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.

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?

[GIANLUCA]

Re: 42 inch Pompeii build i Norway

3/1/1/1 sand fireclay lime Portland
Keep a good circle 1st 2 are easy

[Steellearning]

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?

[Steellearning]

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

[Steellearning]

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.

[Mario Natali]

Re: 42 inch Pompeii build i Norway

Hi , Great work you can find ceramic fiber insulation here

http://www.gustavsenas.no/default.pl...16&pageId=1069

works great

[Steellearning]

Re: 42 inch Pompeii build i Norway

Hi , Great work you can find ceramic fiber insulation here

TERMISK ISOLASJONSFIBER, 25MMX60CM 7,3M

works great

Thanks... sure is expensive stuff. I may have to go with only one layer and then rockwool over that.

[Steellearning]

Re: 42 inch Pompeii build i Norway

I've been in contact with refractory experts in Norway and they think I should use a more environment friendly insulation blanket with AES fibers, FyreWrap?/Insulfrax? S blanket. It is less expensive too at least here in Norway.
Any thoughts on AES fibers?

[hodgey1]

Re: 42 inch Pompeii build i Norway

No thoughts on the insulation but your build is coming along very nice! Keep posting more pics. Also, what town are you located in Norway?

[UtahBeehiver]

Re: 42 inch Pompeii build i Norway

I used firewrap but dont use type that has a polyalumium outer wrap. It is a possible barrier for water vapor.