#1  
Old 11-14-2010, 03:26 PM
Peasant
 
Join Date: Oct 2010
Location: San Antonio, TX
Posts: 36
Default Does a clay flue need to be surrounded?

I have built a clay flue, recesses at a 45 degree angle towards the center of the oven. I built some small fires today and it seems to draw really well.

The question now is if I need to enclose the clay flue with a firebrick chimney? I am going to build an entire enclosure similar to the second picture below. Is the clay flue OK just sitting in there with the insulation, or should I build a chimney enclosure around it all?

The 'bricks' you see sitting in front of the flue right now are not structural. I just put some thin cuts there temporarily with some wedges to show where I would start building the chimney up. A 45 degree inclined chimney will not be much fun, but I think I can do it!

Thanks!
-jared
Attached Thumbnails
Does a clay flue need to be surrounded?-oven.jpg  
Reply With Quote
  #2  
Old 11-14-2010, 03:28 PM
Peasant
 
Join Date: Oct 2010
Location: San Antonio, TX
Posts: 36
Default Re: Does a clay flue need to be surrounded?

Sorry... here is the photo of the example oven.
Attached Thumbnails
Does a clay flue need to be surrounded?-example-oven.jpg  
Reply With Quote
  #3  
Old 11-14-2010, 04:42 PM
Peasant
 
Join Date: Oct 2010
Location: San Antonio, TX
Posts: 36
Default Re: Does a clay flue need to be surrounded?

OK, nevermind, I answered my own question... I missed this line in the instructions "The separation of the flue liner from the surrounding concrete or masonry shall not exceed the wall thickness of the flue liner". So I will have to surround it with masonry, and my oven enclosure can't be considered that masonry surround
Reply With Quote
  #4  
Old 11-15-2010, 06:37 AM
dmun's Avatar
Moderator
 
Join Date: Jul 2005
Location: New Jersey USA
Posts: 4,216
Default Re: Does a clay flue need to be surrounded?

Well, yes, your oven enclosure, if solid masonry like the one pictured, can substitute for the masonry chimney. After all, every masonry fireplace has a broad taper leading up to the chimney where the stack of flue tiles is unsupported.

In earthquake zones, that airspace is substituted for refractory insulation to keep the flue stack from moving around when the earth moves. Since you need to support a semi-horizontal run of tile anyway, you may want to consider packing vermiculite concrete around the flue where it's in the larger enclosure.
__________________
My geodesic oven project:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
,
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #5  
Old 11-15-2010, 08:21 AM
Peasant
 
Join Date: Oct 2010
Location: San Antonio, TX
Posts: 36
Default Re: Does a clay flue need to be surrounded?

Quote:
Originally Posted by dmun View Post
Well, yes, your oven enclosure, if solid masonry like the one pictured, can substitute for the masonry chimney. After all, every masonry fireplace has a broad taper leading up to the chimney where the stack of flue tiles is unsupported.

In earthquake zones, that airspace is substituted for refractory insulation to keep the flue stack from moving around when the earth moves. Since you need to support a semi-horizontal run of tile anyway, you may want to consider packing vermiculite concrete around the flue where it's in the larger enclosure.

Interesting. I was planning on using steel frame and cement board, and then running stone and brick all the way up (including the ceilings). In that case if I put in the portland cement/vermiculite mixture versus loose fill, and let that mixture cover the flue, then I would be OK? Or even better, just the portland/vermiculite around the flue and loose fill everything else? That won't be too tight on the clay tile? If that is the case then you just made my day! Thanks for all your feedback by the way, it has really helped through this build process.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
clay flue and metal pipe together blamejane Getting Started 0 07-25-2010 07:17 AM
clay flue in san diego David D Finding Building Materials 14 01-23-2010 08:23 PM
Clay Flue Question ? interguglielmi Newbie Forum 9 11-13-2009 10:04 AM
Cutting Clay Flue Cypress Pompeii Oven Construction 4 06-05-2009 08:03 AM
attaching a chimney cap to a clay flue Caleb Design Styles, Chimneys and Finish 9 11-18-2008 03:36 PM


All times are GMT -7. The time now is 06:38 AM.

Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
2006/10 Forno Bravo, LLC