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Old 03-06-2013, 12:39 PM
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Default Keystone Size

Is it ok to have a final keystone that is about 1/2" at the base and 3/4" at the top. Do you need mortar for a keystone of that size?
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Old 03-06-2013, 09:52 PM
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Default Re: Keystone Size

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Originally Posted by K79 View Post
Is it ok to have a final keystone that is about 1/2" at the base and 3/4" at the top. Do you need mortar for a keystone of that size?
It will crack, adjust you arch to work bricks either with slightly larger joints or a flatter arch.
You should work it out prior to laying the arch.
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Old 03-07-2013, 04:27 AM
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Default Re: Keystone Size

What should be the minimum area of the small side of my keystone? Any pointers as to what I should do? What would the ideal keystone be?
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Old 03-07-2013, 09:11 AM
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Default Re: Keystone Size

I have a design now where my keysotone will be as round as I can make it. The top of my keystone would have a radius of 2.5" and the bottom 2.18". Do these dimensions look sound?
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Old 03-07-2013, 08:17 PM
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Default Re: Keystone Size

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Originally Posted by Karangi Dude View Post
Sounds fine to me, you won't really know until you get there.
The only thing I would say is make sure it is not to tight a fit you wan't it to be a snug fit.
I think they are talking about the front arch, not the top of dame.
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Old 03-07-2013, 10:34 PM
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Default Re: Keystone Size

Ok my bad, I saw a graphic of an arch with a whopping great gap at the top so I assumed it was for the arch.
Here.
http://www.fornobravo.com/forum/f8/m...tml#post146703 (Mortar Joints)
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Last edited by brickie in oz; 03-07-2013 at 10:40 PM.
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Old 03-08-2013, 12:43 AM
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Default Re: Keystone Size

I was using my bestest Inspector Clouseau accent.......
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Old 03-12-2013, 07:24 AM
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Default Re: Keystone Size

Ok, my keystone changed (on my plans) due to the change in brick dimensions. Does this look ok overall? My firebrick is 9x4 7/16x2 5/16.


Last edited by K79; 03-12-2013 at 07:45 AM.
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Old 03-12-2013, 11:23 PM
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Default Re: Keystone Size

As an aspiration, that looks great. But just be prepared to make adjustments along the way! Your oven is not going to come out precisely as you draw it. My keystone turned out pretty small (relative to many), but I really only started to plan it when I got to the last three courses.

Keystone Size-wp_000031-2-.jpg

My $0.02 is that you might want to plan for the plug to be a little bigger than what you have now, because your mortar joints are more likely to be too big than too small, eating up any wiggle room you have.
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Old 03-13-2013, 04:41 AM
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Default Re: Keystone Size

If your keystone is multiple pieces should you put them together dry and slide them in place with no mortar? Same goes for one piece if you can. Should you slide that in without mortar too?
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