#1  
Old 11-17-2008, 09:15 AM
Serf
 
Join Date: May 2008
Location: Flagstaff, AZ
Posts: 10
Default attaching a chimney cap to a clay flue

I was hoping for a little advice on the best way to attach a chimney cap to a clay flue. I am planning to have my local metal shop fabricate a cap.... essentially, the cap will be a rounded piece of iron and I was thinking I'd have them drop four prongs that I could attach to the clay flue with nuts and bolts. Is this a bad idea? Does anyone know how easy/difficult it is to drill a small hole in a clay flue?

Thanks!
Reply With Quote
  #2  
Old 11-17-2008, 09:39 AM
dmun's Avatar
Moderator
 
Join Date: Jul 2005
Location: New Jersey USA
Posts: 4,216
Default Re: attaching a chimney cap to a clay flue

You might start by looking at the commercial chimney caps, which are sized to fit the two main flue tiles, and see how they clamp to the edge of the flue.

There's no reason you couldn't drill through the tile, but it seems like a potential freeze/thaw problem, if the hole gets wet.
__________________
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
  #3  
Old 11-17-2008, 09:39 AM
Les's Avatar
Les Les is offline
Il Pizzaiolo
 
Join Date: Sep 2005
Location: Carson City, NV
Posts: 2,830
Default Re: attaching a chimney cap to a clay flue

Caleb,

What are you planning on covering the flue with? I used brick and set in some lead anchors to screw into. You can drill into the liner with no problem - my concern is that it's pretty brittle and if you crack it, well, that would be bad...

Les....
__________________
Check out my pictures here:

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


If at first you don't succeed... Skydiving isn't for you.
Reply With Quote
  #4  
Old 11-17-2008, 10:02 AM
Serf
 
Join Date: May 2008
Location: Flagstaff, AZ
Posts: 10
Default Re: attaching a chimney cap to a clay flue

Hi guys,

Thanks for your speedy response. Freeze/thaw is definitely something I should consider. Flagstaff is at 7,000 ft and experiences a nightly freeze/thaw cycle about 80% of the year.

I wasn't planning to cover the flue... is that a bad idea? I've gotten the oven chamber up to ~300 degrees and the chimney did a great job of funneling the smoke. I assume one reason to cover the flue is to insulate it but if it funnels the smoke, is that necessary?

I've been considering having the shop fabricate a cylinder with an outer diameter = inner diameter of the flue. If the cylinder was long enough (1 foot or so), it should be stable in high winds. The cylinder liner would attach to the top cap via 4 prongs. Thoughts?

Oh yeah, here is my Picasa photos of the oven so you know what I am dealing with. I'm a novice at this whole thing, which you may find evident in the photos.

Picasa Web Albums - Caleb

Thanks a bunch, you guys are great!
Reply With Quote
  #5  
Old 11-17-2008, 12:22 PM
Apprentice
 
Join Date: Jul 2008
Location: NC
Posts: 161
Default Re: attaching a chimney cap to a clay flue

Caleb, I would cover it if for no other reason than to keep water out of the chimney and dome.
Reply With Quote
  #6  
Old 11-17-2008, 05:42 PM
Chef's Avatar
Apprentice
 
Join Date: May 2008
Location: North Providence RI USA
Posts: 175
Default Re: attaching a chimney cap to a clay flue

We had a wind storm of the weekend and can't seem to find our chimney cap...we never even tightened the screws around the clay flue never mind drill holes in it. We were planning on extending the chimney in the spring to improve the draw.

So my advise is DO secure the cap...let us know what you do end up doing!!
__________________
Check out our blog for a glimpse into our hobbies of home brewing, soda, beer and wine, gardening and most of all cooking in our WFO!


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #7  
Old 11-17-2008, 08:29 PM
Apprentice
 
Join Date: Oct 2007
Location: SC usa
Posts: 126
Default Re: attaching a chimney cap to a clay flue

Caleb,
Easy way to attach is to have the four prongs made so they slip inside the flue about a foot. If you don't worry much about wind, a friction fit will hold it in place...for a little bit of security, you can use sodium silicate sealer or other heat resistent adhesive...there's a caulk tube material sold at Lowes that'll go to 2000 and is sticky as the dickens... it seems like it adheres metal pretty good to brick once it sets up, so no reason why it won't bond the cap prongs to the inside of the flue.
__________________
Paradise is where you make it.
Reply With Quote
  #8  
Old 11-18-2008, 05:24 AM
Serf
 
Join Date: Nov 2007
Location: doylestown pa
Posts: 24
Default Re: attaching a chimney cap to a clay flue

Caleb- great looking dome!

isn't that an 8" or 10" round terra cotta flue? Just google "chimney caps" and dozens of suppliers will come up offering hundreds of caps styles-- from about $30 to 300. they usually have set screws or bands which tighten.

probably lot easier , and cheaper, than fabricating... IMHO.

Ben
__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Lovin my Oven
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


Ben Ciliberto, Doylestown Pa

Oven Pics Link-
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #9  
Old 11-18-2008, 05:47 AM
Apprentice
 
Join Date: Jul 2008
Location: NC
Posts: 161
Default Re: attaching a chimney cap to a clay flue

Les,
Did you make or buy your flue cover? It looks great!
Reply With Quote
  #10  
Old 11-18-2008, 03:36 PM
Serf
 
Join Date: May 2008
Location: Flagstaff, AZ
Posts: 10
Default Re: attaching a chimney cap to a clay flue

Hi everyone,

Thank you for your input. Below is a picture of the design I went with. My local welder is fabricating it for me. I'll likely use some heat resistant adhesive to fully secure it. It should be done in a week or so and I'll let you know how it comes out!

The top of the chimney cap is meant to replicate the San Francisco Peaks, which is also in my backyard.

Thanks again

Picasa Web Albums - Caleb
Attached Thumbnails
attaching a chimney cap to a clay flue-chimneycap.jpg   attaching a chimney cap to a clay flue-peaks.jpg  
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
Chimney options Yahoo-Archive Design Styles, Chimneys and Finish 3 10-01-2010 10:18 AM
Chimney Stainless vs. Clay. Gentcpa Design Styles, Chimneys and Finish 1 10-20-2007 10:26 PM
Chimney / Flue Question.. johnrbek Pompeii Oven Construction 1 02-20-2007 03:07 PM
OOPS! I didn't use a clay liner in my chimney bruce324 Design Styles, Chimneys and Finish 6 01-21-2007 08:45 AM
Flue Chimney Tips Alf Design Styles, Chimneys and Finish 1 08-02-2005 07:07 AM


All times are GMT -7. The time now is 08:45 AM.

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