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  #1  
Old 06-17-2010, 07:03 PM
Serf
 
Join Date: Nov 2009
Location: Idaho
Posts: 9
Default CRACK in my arch?

So I cured my oven properly and then after about 5 hot fires this crack developed in my arch. Is there a way to repair it or should I just take my chances? Any ideas would be helpful, Thanks
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  #2  
Old 06-17-2010, 07:49 PM
Journeyman
 
Join Date: Jun 2009
Location: minnesota, usa
Posts: 472
Default Re: CRACK in my arch?

Eh. Mine has a WAY bigger crack than that.
As Jay would say "bake on"
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  #3  
Old 06-18-2010, 08:41 AM
lwood's Avatar
Master Builder
 
Join Date: Jul 2009
Location: philippines
Posts: 642
Default Re: CRACK in my arch?

Don't worry about it, maybe a little heatstop or refractory mortar, to fill in the crack if it bothers you.
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Old 06-18-2010, 08:44 AM
Il Pizzaiolo
 
Join Date: Nov 2006
Location: San Antonio
Posts: 1,719
Default Re: CRACK in my arch?

To paraphrase Hogan in Crocodile Dundee....

You call that a crack! I'll show you a crack!!!!!

....ovens always have differential expansion and I doubt anyone has an oven long without developing a crack of some kind.

Fire On!
Jay
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  #5  
Old 06-18-2010, 02:33 PM
Pdiff's Avatar
Apprentice
 
Join Date: Oct 2008
Location: Idaho, USA
Posts: 119
Default Re: CRACK in my arch?

Ok, I'll be the nay sayer here. Watch that you don't get a corresponding crack on the other side of the arch. That's what happened with me. I let it go and eventually the middle section was completely loose. The problem was, when I fired it would expand and the loose center section would slip slightly down. After many fires, this began to act as a wedge, slowly driving the arch and supporting opening walls out. Cracks developed in the side walls and they started to splay out. I had to rip out the whole entryway-vent structure and rebuild. I made the side walls much thicker this time and did a slow wet cure. Unfortunately,the crack has come again, but only on one side. Still, it make me nervous. If things get worse, Ill cut it out and remortor that section.
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Old 06-18-2010, 04:32 PM
Serf
 
Join Date: Nov 2009
Location: Idaho
Posts: 9
Default Re: CRACK in my arch?

Thanks for the heads up!
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  #7  
Old 06-19-2010, 01:36 AM
david s's Avatar
Il Pizzaiolo
 
Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 4,855
Default Re: CRACK in my arch?

I believe that cracks in the arch are due to temp differential ie hot on inside and cold on outside. This problem can be reduced enormously by simply having a small gap between the outer arch and the inner parts of the oven. It can be an air gap or filled with vermicrete.It also has the advantage of keeping the outer arch cooler and therefore safer, to touch. The heat loss through conduction is also lowered.
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Old 06-19-2010, 12:21 PM
Apprentice
 
Join Date: Oct 2009
Location: Minnesota
Posts: 106
Default Re: CRACK in my arch?

I think anyone who builds a brick oven needs to make inner peace with cracks, and assume that from time to time, minor repair will be necessary.
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Old 06-19-2010, 12:31 PM
Il Pizzaiolo
 
Join Date: Nov 2006
Location: San Antonio
Posts: 1,719
Default Re: CRACK in my arch?

Well said Eric! Part of the good news is that after building the oven I think many/most of us have the skills necessary for those repairs!

Eat more Pie (pizza that is!)
Jay
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  #10  
Old 06-19-2010, 06:15 PM
Neil2's Avatar
Il Pizzaiolo
 
Join Date: Oct 2006
Location: Vancouver Island
Posts: 1,374
Default Re: CRACK in my arch?

Mortar layer between arch bricks is too thick. Try for about 1/64 th of an inch or less.
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