#31  
Old 05-03-2012, 08:59 PM
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Default Re: The Backofen

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Originally Posted by Coloradoredusa View Post
so I cut a bunch of bricks at a 7 degree angle today .. question.. on the sailor course, when i do set them in HS50 do I stagger the mortar joints on the second course? Do I cut the the second course with the taper 7 deg? Or do I do whole half brick?

Mortar the first chain together by the sides. you don't need to mortar to the floor.

If you want those tighter joints, the second chain (and all after that) will also have the 7 degree cut on both sides. And yes, stagger the joints

I think your second chain will be tilted in a bit. To figure this out, mock up the profile of your dome on a flat surface with a bunch of half bricks to see how much you need each chain to be tilted. Try to keep it uniform for each chain. It's probably going to be 1/4 or 3/8" range. You can do this with just the mortar

Of you want to avoid the triangular joints inside the oven, then check out the approach in this thread for cutting the bricks (Twist and Tilt). It's not neccessary to do this, but it does give you nice tight joints inside the oven and doesnt really take any longer.

Here's a picture of the first three chains on my oven for reference. Note that I built my dome around my floor, and didn't start the arch of my dome until the fourth chain - so it's not exactly the same but will give you reference on how your first two chains should look.
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  #32  
Old 05-03-2012, 09:30 PM
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Default Re: The Backofen

Thanks DJ..I think I will just go with the 7deg cuts.. I will be ok with the small mortar joints on the inside..I do appreciate the quick responses..Thanks!
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  #33  
Old 05-03-2012, 10:45 PM
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Default Re: The Backofen

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should I put a tapered brick in the center ?
It's not required. If it's the outside arch you can get creative. I put in a piece of Nevada granite that I pulled out of the desert. We've seen quite a few clever ideas for a keystone.
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  #34  
Old 05-04-2012, 07:04 AM
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If you taper your bricks, you can make three cuts per brick and have two tapered half-bricks if you plan well enough. It will work for several rings.

Staggering the bricks on each ring is important. I still recommend at least 1/4 inch of mortar between the bricks, rather than contact at the edges (wish I had left that 1/4 inch in there!). You are watching for freezing weather, right Trellis?
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  #35  
Old 05-04-2012, 12:40 PM
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Default Re: The Backofen

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Originally Posted by Coloradoredusa View Post
Thanks DJ..I think I will just go with the 7deg cuts.. I will be ok with the small mortar joints on the inside..I do appreciate the quick responses..Thanks!
I love to feel like I can be helpful (whether I am or not!). I have learned so much from others on this site. Wouldn't have much more than a pile of bricks were it not for the patient input of others

BTW - looking at your pictures of the first chain - are you going with that layout, or are you tapering them?
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  #36  
Old 05-05-2012, 08:19 AM
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Default Re: The Backofen

lots of work yesterday..
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  #37  
Old 05-05-2012, 10:14 AM
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Is looking good Trellis
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  #38  
Old 05-05-2012, 09:03 PM
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Finished the arch today!!!!!!!!! too dark to take pics.. pics tomorrow!
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  #39  
Old 05-07-2012, 07:53 PM
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Arch Mortared in and 3rd course finished..hopefully will have time on the weekend to do course 4!
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  #40  
Old 05-13-2012, 07:13 PM
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So not much progress.. last week was back to work after Vacation..long days ,then crappy weather.. this weekend continued crappy weather and today Mothers Day!..so this next week I will cut more firebrick and look to getting another course done!
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