#11  
Old 03-01-2013, 11:37 AM
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Default Re: Mortar Joints

That one is 15-1/2" ceiling for a 42" oven. Soldier or sailor, just change the angle of the cut to get the ceiling height you want.
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  #12  
Old 03-01-2013, 11:58 AM
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Last edited by K79; 03-01-2013 at 12:24 PM.
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  #13  
Old 03-01-2013, 12:36 PM
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Default Re: Mortar Joints

That looks fine. Don't precut your keystone though....
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Old 03-01-2013, 01:05 PM
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That'll be the last thing I cut. Thanks so much for the help!
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Old 03-02-2013, 02:21 PM
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Default Re: Mortar Joints

I made my keystone in 3 pieces, you certainly can too. See here: http://www.fornobravo.com/forum/8/36...tml#post141968 (36" Pompeii in DC), though I imagine the way I did it is somewhat easier than the way you showed in your picture--cutting square bricks into triangles sounds tricky...
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Old 03-04-2013, 06:34 PM
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Default Re: Mortar Joints

That keystone has a familiar shape to it
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Old 03-05-2013, 07:30 AM
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Default Re: Mortar Joints

Ok guys.... So if I could achieve a 3/8" mortar joint between all my bricks that would be ideal correct???
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Old 03-05-2013, 08:07 AM
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Default Re: Mortar Joints

Unlike normal brick and mortar, the normal joint for firebrick and refractory cement is 1/8-1/4", so that would be ideal, although not practical for an oven. Just keep them as small as possible on the interior face and don't worry about the outer joint (stuff it full of mortar).
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Old 03-05-2013, 08:56 AM
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Default Re: Mortar Joints

Quote:
Originally Posted by Tscarborough View Post
Unlike normal brick and mortar, the normal joint for firebrick and refractory cement is 1/8-1/4", so that would be ideal, although not practical for an oven. Just keep them as small as possible on the interior face and don't worry about the outer joint (stuff it full of mortar).
I'm speaking out of ignorance here, but why can't 1/4" be achieved or practical?
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Old 03-05-2013, 09:03 AM
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Default Re: Mortar Joints

Because you are building a spherical object out of cubic units.
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