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K79 03-06-2013 12:39 PM

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?

brickie in oz 03-06-2013 09:52 PM

Re: Keystone Size
 
Quote:

Originally Posted by K79 (Post 147112)
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. :)

K79 03-07-2013 04:27 AM

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?

K79 03-07-2013 09:11 AM

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?

brickie in oz 03-07-2013 08:17 PM

Re: Keystone Size
 
Quote:

Originally Posted by Karangi Dude (Post 147165)
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. :confused:

brickie in oz 03-07-2013 10:34 PM

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

brickie in oz 03-08-2013 12:43 AM

Re: Keystone Size
 
I was using my bestest Inspector Clouseau accent.......:rolleyes:

K79 03-12-2013 07:24 AM

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.

http://i1342.photobucket.com/albums/...psb43c1cfe.jpg

deejayoh 03-12-2013 11:23 PM

Re: Keystone Size
 
1 Attachment(s)
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.

Attachment 34234

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.

K79 03-13-2013 04:41 AM

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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