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  #51  
Old 06-21-2012, 10:35 PM
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Default Re: Napa WFO dome & hearth build questions

Quote:
Originally Posted by Tscarborough View Post
...For an 8x8 OD flue, your actual cross section is closer to a 6-1/2" ID round flue...


Soooo.... Would a 6" or 7" flue liner work?

I was thinking of either using;

1) A clay flue liner and leaving a gap between it and the "Money Shot" bricks, rock etc and filling the void with pearlcrete.
2) A cheap metal stove pipe (6" diam. single wall) and using it in the same way, basically it would be a form left in place for the pearlite.

Any ideas? Comments? Winning lotto numbers?

Eric.
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  #52  
Old 06-22-2012, 03:52 PM
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Default Re: Napa WFO dome & hearth build questions

I did A, but have seen it done like B, but the metal was removed and the perlcrete was parged with refractory.
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  #53  
Old 06-22-2012, 05:25 PM
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Default Re: Napa WFO dome & hearth build questions

Quote:
Originally Posted by EricU View Post

Soooo.... Would a 6" or 7" flue liner work?

I was thinking of either using;


2) A cheap metal stove pipe (6" diam. single wall) and using it in the same way, basically it would be a form left in place for the pearlite.

Any ideas? Comments? Winning lotto numbers?

Eric.
Be careful, if going for this idea. What will happen when the cheap stove pipe corrodes away? your perlite will pour down the flue if placed in dry. Or if you have mixed cement with it, then it will probably break down, crumble (portland cement is only good for 300 C, perlite OK below 1100 C) and pour down your flue. Your first solution would be a safer alternative.

Last edited by david s; 06-22-2012 at 05:28 PM.
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  #54  
Old 10-12-2012, 09:27 PM
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Default Re: Napa WFO dome & hearth build questions

Soooo... I finally am getting around to (hopefully) finishing up the WFO portion of my backyard. Looking back, I think I started it around May 2010, been using it to cook chicken, pizzas, lamb, vegetables...etc, etc...blah, blah, blah.

Anyway, I am going to try to make the transition to the chimney tomorrow.

Going to pick up some 8x17 oval clay flue liners tomorrow, cut them and put them back together as an 8" circle, then wrap them with the "money shot" bricks/rocks.



Should I:
  1. Fill the gap between the flue liner exterior and the inside of the brick chimney with Pearlcrete?
  2. Leave the gap empty?
  3. Wait another two years to start the chimney?
Thanks for any help! Eric
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Napa WFO dome & hearth build questions-wfo-oct-2012-1-.jpg   Napa WFO dome & hearth build questions-wfo-oct-2012-2-.jpg  
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  #55  
Old 10-12-2012, 09:40 PM
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Default Re: Napa WFO dome & hearth build questions

These photos may help show my situation.


Thanks for any help! Eric
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Napa WFO dome & hearth build questions-wfo-rafters-02.jpg   Napa WFO dome & hearth build questions-wfo-rafters-03.jpg   Napa WFO dome & hearth build questions-wfo-oct-2012-7-.jpg   Napa WFO dome & hearth build questions-wfo-oct-2012-1-.jpg   Napa WFO dome & hearth build questions-wfo-oct-2012-2-.jpg  

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  #56  
Old 10-14-2012, 05:52 PM
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Default Re: Napa WFO dome & hearth build questions

I got a little farther yesterday. I didnt have time today as I was acid staining my driveway and front walk (why not?)

The two side and rear panel pieces are complete, the rough wiring is in and I got the flue transition pieces kind of figured out.

I was able to get the WFO flue transition pieces to the point that my brick laying is now flat and on the same plane, so I don't have to split bricks, just cut them to size. Got a couple of decent size rocks mounted and supported.

I called one of my local mason's supply yards in town and asked about 8" diameter round clay flue liner. They said they could order it and all they had was some 8x17s, I decided to get them and modify them. There is a pic below, they came out better than I had expected.



I am moving the flue liner riser to the right to clear my ridge beam with a series of angled cut bricks, the angles are more than degrees which is probably more than fuild dynamics would like but;
  1. I needed to get it moved over quickly without losing too much height
  2. It has been a long time since I was in college and had fluid dynamics and we will just see how it draws!

[IMG][/IMG]
Attached Thumbnails
Napa WFO dome & hearth build questions-wfo-flue-assembly.jpg   Napa WFO dome & hearth build questions-wfo-chimney-liner.jpg   Napa WFO dome & hearth build questions-wfo-chimney-10-.jpg   Napa WFO dome & hearth build questions-wfo-chimney-1-.jpg   Napa WFO dome & hearth build questions-wfo-chimney-7-.jpg  

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  #57  
Old 10-14-2012, 06:30 PM
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Default Re: Napa WFO dome & hearth build questions

Eric,

Like the mix use of materials and the outside the box organic look to the panels.
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  #58  
Old 10-14-2012, 08:43 PM
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Default Re: Napa WFO dome & hearth build questions

Looks like you've got some cat5, coax, fiber, and about 220volt panel wired into that thing!

I like the finish though. And that is quite a chimney design. 8" interior on 42" should draw well.
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  #59  
Old 10-15-2012, 12:01 PM
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Default Re: Napa WFO dome & hearth build questions

[QUOTE=deejayoh;140361]Looks like you've got some cat5, coax, fiber, and about 220volt panel wired into that thing!...QUOTE]

Just a 120V dedicated outdoor circuit and a bunch of switch legs for a lot of different lamps hanging off the thing. I am tired of asking my kids "Where's my flashlight..." as it gets dark early here in Northern California during our brutal winters!! I also wired the upper eaves for speaker wires to connect to a Sonos system.

I really want to get it finished up now that I am working on it again and will not fire up the WFO again until I at least get the chimney stack proud of the rafters. So until then, we are eating chicken off the BBQ, and no pizzas!! (talk about roughing it)

Eric.
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  #60  
Old 10-17-2012, 01:00 PM
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Default Re: Napa WFO dome & hearth build questions

Eric -

You may be past this already - but I originally tried a 6" clay flue liner and ended up removing it and going with a 9x13 liner. It really draws nicely.

To encase the chimney flue - I wrapped the full length with leftover insulating blanket and made a cement-board sheath that ended up as the outside of the chimney. Just did a stucco finish. Dozens of oven firings and it draws perfectly fine and the outside of the chimney (stucco) doesn't get hot at all.

Nice looking build - by the way.
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