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  #21  
Old 06-25-2009, 02:22 PM
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Default Re: Gus's Corner - Timo's Build

Taper bricks are a standard refractory item: My Harbison-Walker branch had them in stock. They are mostly high duty since they are used for furnaces and such. It was a cost issue for me: They were four times as much as regular firebrick from the brickyard.
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  #22  
Old 06-25-2009, 05:08 PM
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Default Re: Gus's Corner - Timo's Build

keep me posted I would gladly use them if you don't end up needing them. Let me know as things progress

Peter
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  #23  
Old 06-26-2009, 08:33 AM
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Default Re: Gus's Corner - Timo's Build

dmun, I think you mentioned early the differences between heat properties between low and high duty firebricks. I believe you are right about the taper bricks being high duty. Here's a pic of the regular flats and the tapers.

The tapers cut and look more like marble.

I am thinking that I do not want to mix the different bricks together at the vent arch seeing how that's the point of extreme heat. I believe it would be better to have the high duty bricks in that area to help with the smoke draw.

The whole point was do I make the arch bigger than the natural 15 1/4" width by adding splits or flats to the arch and to do that with the same high duty bricks would mean sourcing those.
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  #24  
Old 06-30-2009, 04:08 PM
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Default Re: Gus's Corner - Timo's Build

Well, this is really turning out to be a project. My wife is still OK with it all (Like she has a choice at this point) but is getting restless for an oven dome to begin taking shape. I have been trying to gather a critical mass of knowledge before placing the first bit of mortar on a brick. Here's my final spacing for the dome arch mock up.

And this is what I decided to do about insulation. I have 3 1/2" of perlite and on top that I have a 1" SuperIsol board. Looks like this:


I also have 100 square feet of 1" #6 Fiberfrax Durablanket.
I think I am ready to take the final plunge. Here we go.
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  #25  
Old 07-05-2009, 06:28 PM
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Default Re: Gus's Corner - Timo's Build

I slapped the arch together before the Fourth of July holiday and when I came back I wanted to see how strong it was so I took this picture. I removed the arch form about an hour after placing the bricks. The #2 taper bricks fit perfectly into the keystone I made. I had to tap it into place with a rubber mallet and that was that. The height of the arch topped out at 12 1/2" inches.
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  #26  
Old 07-05-2009, 08:01 PM
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Default Re: Gus's Corner - Timo's Build

That's the look of confidence!
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  #27  
Old 07-05-2009, 08:42 PM
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Default Re: Gus's Corner - Timo's Build

Nice looking arch, Timo. I wish I had made mine half-circle arches. It obviously will hold up the weight of your flue, etc.
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  #28  
Old 07-06-2009, 07:43 AM
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Default Re: Gus's Corner - Timo's Build

Timo,

Looks great...it should move quickly now

Peter
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  #29  
Old 07-06-2009, 04:11 PM
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Default Re: Gus's Corner - Timo's Build

great job!

It's always nice to stand on something you've built....seriously - there's something about it... feels like victory!
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  #30  
Old 07-10-2009, 04:25 PM
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Default Re: Gus's Corner - Timo's Build

Here's what I have so far. I had to slow down and heal some mortar burns in my fingers, but made some big progress after the first three courses. I found the first three tedious and I was stressing out over the beginning of the dome. I ended up using some extra wood trim for an interior door for my shims to set the dome spacing. That only took 2 1/2 weeks to figure out...

I am having some issues with the tips of the bricks touching the course below at this point. I guess I'll have to cut smaller blocks and space them out among some regular blocks. The outer arch and vent opening sort of turned out ok. The last block went in really tightly and was worried about it pushing out the whole left side if the arch, but luckily the mortar was still a bit wet in the last blocks that they kinda displaced a bit more mortar rather than moving the whole arch. The taper bricks are really strong not long after the mortar has set. I was able to remove the forms about an hour after completing. Just for fun I placed the 8x13" flue tile on top the arches and it was fine.


Well, I have basically compressed a half year's worth of weekends into the last month and will be approaching my oven work cut off point. After July 19th summertime is over and it's back to who knows when I get time to get to the oven...

I would like to close it in and set the flue next week, but who knows...
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