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  #11  
Old 06-19-2010, 09:42 PM
eprante's Avatar
Journeyman
 
Join Date: May 2009
Location: El Cajon CA
Posts: 282
Default Re: CRACK in my arch?

1/64 of an inch? Neil what are you mixing your mortar with, talcum powder? How do you get a joint that small
Eric
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  #12  
Old 06-20-2010, 11:51 AM
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Il Pizzaiolo
 
Join Date: Oct 2006
Location: Vancouver Island
Posts: 1,374
Default Re: CRACK in my arch?

Well. As thin as possible then. Mortar is not a "glue" in compression structures such as arches. It's only function is to transfer the load evenly from one face to the next.
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  #13  
Old 06-22-2010, 03:18 PM
Peasant
 
Join Date: May 2010
Location: Menifee, CA
Posts: 32
Default Re: CRACK in my arch?

Hi, all-

I need some advice. The top three bricks of my entry arch (including the keystone) into the dome have come loose. After fire up, they are rocking as I put the door in to retain heat for the week. I am wondering if anyone has had a similar problem and has had to R&R any part of their arch? Should I leave it alone until the bricks fall? Or should I remove them and re-mortar them in place? This is my 8-th large fire-up after curing.

Tom
Menifee. CA
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  #14  
Old 07-01-2010, 05:16 PM
Peasant
 
Join Date: May 2008
Location: nj
Posts: 26
Default Re: CRACK in my arch?

Cracks....fired up the oven on schedule....8 fires, all good. 9th fire, fired it up good and long...cracks galore..no smoke escapes however....I guess I just have to hang in there until the bricks or mortor get loose? Comments?
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  #15  
Old 07-01-2010, 08:35 PM
Peasant
 
Join Date: May 2010
Location: Menifee, CA
Posts: 32
Default Re: CRACK in my arch?

Hi-

I think cracks (especially in the mortar joints) are totally OK-the oven needs a place to move around and those cracks provides some good expansion room.

Each time I fire, the arch bricks get tight again, so I think that they need to just hang loose cool so that they can have room to move in the heat.

I know we tend to think that the whole thing will come down at some point, but I really think that these ovens will outlast us!

Fire on and long (I fired mine for 6 hours today and it was fun!)

Are your bricks cracking, or just your mortar joints?

Tom
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  #16  
Old 07-04-2010, 12:02 AM
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Join Date: Mar 2009
Location: Whittlesea
Posts: 3,455
Default Re: CRACK in my arch?

Looks like the different expansion rates from the terra cotta flue and the refractory bricks caused the crack to me.
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  #17  
Old 07-04-2010, 04:08 AM
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Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
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Default Re: CRACK in my arch?

Apart from not liking the look of a crack, oh my god my oven is broken? The main problem is that it provides access for water entry from the weather and the resulting problems of having a wet oven. If possible the cracking problems should be reduced, especially by design features.
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  #18  
Old 09-06-2010, 06:21 PM
Peasant
 
Join Date: Aug 2010
Location: Louisiana
Posts: 29
Default Re: CRACK in my arch?

Man, that crack has niching on mine!
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