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  #51  
Old 11-08-2013, 01:21 PM
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Default Re: 40" corner build in central TX

Thanks Russell, I find it easy to pay attention to details when I'm having fun.
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  #52  
Old 11-08-2013, 03:29 PM
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Default Re: 40" corner build in central TX

Quote:
Originally Posted by ogorir View Post
The center chimney is what I'm after. How do you mean angling the flue? come up straight, then come back over the insulation and turn up again at the middle?

Yup, but you wont be able to do it with clay flue unless you use strapping


My non-aesthetic reason for contemplating center chimney is support. I have no idea if I'm going to get green tagged until I extend the chimney above the house roof, which I'm really not planning for, but I would have an easier time managing if the stack were centered on the dome. At least, I think I would. I didn't leave enough hearth stand on either side of the entryway to do any major buttressing.

I don't know how high you need to go, but the last time I checked, IRC minimum clearance was 3' above the roof edge, 2' above the ridge on a gable end. That should be easy to check online.


I agree with you on the heat-transfer aspect of a true squirrel tail. the outside of the dome brick is going to take a proper long time to get anywhere near the temp of the inside, so while it may have an effect, it's probably not going to be relevant until your oven is heat-soaked. and by then, what's the point? as far as it goes, though, I think it'd be easier to run 3 courses of firebrick up the front of the dome than it would to angle that terracotta flue pipe.

I think you should do whatever you feel like, mainly because it doesn't matter how you run the flue as long as you get a good draw.


It's mostly idle thought right now, I'm going to need to do the archway pretty much the same either way, so I'm going to get that done first. Then the landing overhang thing. At this point, I'm (predictably) regretting penny pinching on the base slab and block stand. I could've easily made it 8" larger both directions and been much more comfortable.
Lessons learned if you build another one.
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  #53  
Old 11-08-2013, 09:57 PM
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Default Re: 40" corner build in central TX

"IBC section 2113.9 Termination. Chimneys shall extend at least 2 feet (610 mm) higher than any portion ofthe building within 10 feet (3048 mm), but shall not be less than 3 feet (914 mm) above the highest point where the chimney passes through the roof."

The oven is located 15 feet from both the garage and the house (local portable open flame ordinance) so I'm hoping that 3' is fine, as that's my plan

I'll probably just frame it up for a standard front chimney... I still have to tear out the old insulation in the attic, seal up, install radiant barrier, blow in new insulation... before the first.
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  #54  
Old 11-09-2013, 03:50 AM
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Default Re: 40" corner build in central TX

Boy, my numbers were a bit dyslexic...but you got the point. The code I referred to was ICC...the IRC section R1003.9 Termination. Different acronym, same numbers.
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  #55  
Old 11-09-2013, 06:27 AM
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Default Re: 40" corner build in central TX

Oh, I looked up IBC 2009 because that's what the city has adopted. I should probably check NFC 2009 as well, which they also use.
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  #56  
Old 11-09-2013, 06:34 AM
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Default Re: 40" corner build in central TX

You're good either way
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Last edited by stonecutter; 11-09-2013 at 06:39 AM.
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  #57  
Old 11-29-2013, 08:54 PM
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Default Re: 40" corner build in central TX

Well, T-day was a success. I didn't get the outside course of the arch done in time to cure, so it still looks funny, but it cooked the bird.

I cured the oven in a somewhat unorthodox way. I started a fire in the dome (no outer arch) on 11/18. I started with newspaper, then cardboard, then sticks, etc. for about an hour, which brought the dome to just under boiling inside. I let it rest for an hour while I was at yoga, then lit it up again when I got back, slowly building the temp from 6:30 til just after midnight. I don't remember the inside temps, but I almost got the dome boiled out, as the top reached 92C at it's peak and I had some steam from a few of the heat cracks. There were a few cracks that first fire, but not a whole lot. the only continuous crack ran concentrically between course 6 and 7.

over the next 2 days I built the chimney support and the outer arch. I actually laid the outer arch bricks once, but I knocked the chimney support brick loose cleaning up joints, then promptly managed to push the keystone out replacing it, so I pulled the whole outer course off.

I waited until this Wednesday to fire again to give the chimney support bricks time to cure. I set a section of chimney on top of the supports and fired from 5:30 to 1am, getting up to 300c or so under sustained flame. Thursday morning at 8am I was at 45c (it was cold for Texas at -1 overnight). I started a fire from the previous night's coals and fired from then to 2:30, stoking every 1/2hr or so. under a good fire I was seeing 400c, but most of the time it was between 250 and 300c. I did get the upper 2/3s of the dome above boiling on the outside at one point or another in the day.

I neglected to buy a decent uncoated roaster for the turkey, so I ended up using 3 disposable pans nested, which extended the cook time a bit. I always cut the turkey up first, so the backbone was removed and the breasts splayed and the legs were in a separate pan. the legs were done in 1:20 or so and the breast took just a hair over 2 hours to 160(barely. no one likes an overcooked turkey). I had them covered the first hour, but I'd probably only cover the first 30 minutes next time. The skin took way longer to brown than I was expecting.

So... Hopefully I can get the outer arch finished this week, maybe insulate too if I'm lucky. I'm thinking of using some kind of water barrier between the cal-sil blanket and the perlcrete, even if it's just building paper(that will likely combust, I know). Every time I've done perlcrete so far I wind up with a puddle under it where uncombined water has run out. I really don't want that in the cal-sil if I can avoid it.

also, what's the best stucco recipe for water-resistance? I know I'll need to treat the surface afterward, but there has to be some way to make the stucco more water-tight.
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  #58  
Old 11-30-2013, 07:25 AM
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Default Re: 40" corner build in central TX

Add marble dust, ie replace 2/3 of the sand with it.
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  #59  
Old 11-30-2013, 08:03 AM
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Default Re: 40" corner build in central TX

Sweet, I should be able to get some locally. Will granite work as well? there are a few granite countertop installers in town.
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  #60  
Old 11-30-2013, 08:54 AM
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Default Re: 40" corner build in central TX

No, granite will not, as far as I know. Check with pool supply places or drive to Austin.
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