#11  
Old 06-18-2008, 07:37 PM
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Default Re: Expansion question... is it a problem?

Hey Dave (asudavew),
Good idea putting the fine wire mesh around the dome for stability for a mobil oven or a mother-nature-earthquake-shake oven. I'll look thru other builds/posts to see if others have done it. If the metal mesh expands differently from the morter, cracking shouldn't be a problem cuz you can't see it anyway.
Thanks, Dino
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  #12  
Old 06-18-2008, 07:55 PM
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Default Re: Expansion question... is it a problem?

Chicken wire mesh and concrete doesn't last. Its good for the initial cure to prevent cracks but will rust away sooner than later. If you are worried about structural integrity then consider fiber reinforcement. It doesnt burn and it doesnt rust. Since you are going to cover this layer anyway it wont matter what it looks like, The fiber reinforced looks furry when finished.

No fiber in the joints just in the shell cover.
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  #13  
Old 06-19-2008, 08:55 AM
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Default Re: Expansion question... is it a problem?

Fiber sounds like a winning idea. Do you know if it's loose and mixed in with the high-temp mortar or is it in short width rolls that you lay strips of it on to the shell?
Thanks, Dino
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Old 06-19-2008, 09:41 AM
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Default Re: Expansion question... is it a problem?

you can get it premixed or loose. Just make sure its NOT cellulose type. I have heard of people using fiberglass cloth or matting layer in concrete. First layer of mortar then cloth soaked in a slurry mix and applied then more mortar on top. You will have to look and see whats available in your area.

Now keep in mind that if you have a quake strong enough to damage this oven, you probably wont have a house to live in either. As far as making it quake proof I think it would be best to leave it as the design goes. The tougher you make it the harder it will fall. The idea behind loose joints gives flexibility in the structure. Structure able to flex makes it stronger. If the oven falls apart it will give you a reason to build it again. Besides by the time this happens you will have a thousand ideas on what you would have done differently anyway.
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