#11  
Old 10-21-2009, 08:01 PM
mluttropp's Avatar
Laborer
 
Join Date: Oct 2008
Location: walnut creek, california
Posts: 79
Default Re: Maximum mortar joint on inner oven surface?

Unless you have an unlimited amount of time to spend cutting each brick I would use the do the best you can approach. If you end up with half inch joints so be it. Remember the goal here is to cook with the oven not spend allbyou tone building it.
Reply With Quote
  #12  
Old 10-21-2009, 08:08 PM
dmun's Avatar
Moderator
 
Join Date: Jul 2005
Location: New Jersey USA
Posts: 4,216
Default Re: Maximum mortar joint on inner oven surface?

Quote:
I have a little bit of an issue with this - I cut every brick to avoid any mortar joint (on the inside). Then again, reality alludes me at times.
Well, yeah, me too, on both counts.
__________________
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
  #13  
Old 10-21-2009, 08:17 PM
Tscarborough's Avatar
Il Pizzaiolo
 
Join Date: Oct 2009
Location: Ausitn
Posts: 3,128
Default Re: Maximum mortar joint on inner oven surface?

Good, then you are building to best practices, and if you are doing it for pay, it is not really an option. If you are doing it for yourself, it is.
Reply With Quote
  #14  
Old 10-21-2009, 08:24 PM
dmun's Avatar
Moderator
 
Join Date: Jul 2005
Location: New Jersey USA
Posts: 4,216
Default Re: Maximum mortar joint on inner oven surface?

Quote:
Unless you have an unlimited amount of time to spend cutting each brick I would use the do the best you can approach.
I once proposed a "cut every other brick" plan, an image a few mesages down on this thread:

http://www.fornobravo.com/forum/f8/a...tion-5617.html (Alternating Partial-Taper brick construction?)

I don't think anyone has done it yet, but I still think it's a great idea.
__________________
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
  #15  
Old 10-21-2009, 08:45 PM
jmhepworth's Avatar
Journeyman
 
Join Date: Feb 2008
Location: Kaysville, Utah
Posts: 291
Default Re: Maximum mortar joint on inner oven surface?

I like the look better if the inside joints are minimal. And I didn't find it all that difficult nipping the edges to come as close to that look as I could. Of course the outside joints were a different matter. I used a lot of mortar there.

Joe
Reply With Quote
  #16  
Old 10-21-2009, 09:22 PM
Les's Avatar
Les Les is offline
Il Pizzaiolo
 
Join Date: Sep 2005
Location: Carson City, NV
Posts: 2,858
Default Re: Maximum mortar joint on inner oven surface?

Quote:
Originally Posted by mluttropp View Post
Remember the goal here is to cook with the oven not spend allbyou tone building it.
Ouch... I was just responding to the words "not practical". I equate it to never - never say never.

David - when it comes to cutting, you are the master. Your approach to the build was awesome.

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
  #17  
Old 10-27-2009, 11:24 AM
Roadkyng's Avatar
Laborer
 
Join Date: Jan 2009
Location: Texas
Posts: 77
Default Re: Maximum mortar joint on inner oven surface?

partially agree. It is not refractory in the sense it is not fired. From what the retailer told me it takes a heat of 1800 to 2100 degrees to properly fire a fireclay mixture. It is refractory compared to a standard sand mix in that it withstands much more heat. From reading it appears the homebrew mix is used in building kilns.
My joints are as narrow in the interior as possible and do not exceed 1/4". Now the exterior is another matter!


Quote:
Originally Posted by Mitchamus View Post

Since the home-brew mortar is non-refractory, it will let heat escape at a greater rate than a true refractory mortar.

If I was running a kiln or blast furnace 24/7 I would care about the excess running costs.
Reply With Quote
  #18  
Old 10-27-2009, 07:11 PM
Tscarborough's Avatar
Il Pizzaiolo
 
Join Date: Oct 2009
Location: Ausitn
Posts: 3,128
Default Re: Maximum mortar joint on inner oven surface?

Portland cement itself is not refractory, but can handle high heat. What causes problems is the aggregate. Fine silica sand is no problem, but other manufactured sands can be. If they are composed of various types of other minerals, they will explosively de-laminate (spall) when exposed to high temperatures. The best practice is to minimize joint size on any face exposed to direct flame.

ASTM C-144 is the aggregate standard for mortar that is NOT exposed to direct flame, and it allows for the use of manufactured sand so long as it is graded properly. This is important because properly graded aggregate will prevent shrinkage cracking which is a very real problem with most refractory mortars due to the fineness and homogeneous gradation of the aggregate.
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
Why Italian Wood-Fired Ovens are Round james Newbie Forum 50 04-01-2014 10:14 PM
Clay pizza oven design improvements/suggestions... bensdb Getting Started 1 04-23-2009 03:04 PM
Wood-fired oven in Dubbo Capt. Toddy Brick Oven Photos 4 04-23-2009 02:44 AM
Mortar and a Poratable oven ritchie UK Design Styles, Chimneys and Finish 1 03-12-2009 08:33 PM
Why we did the Pompeii Oven james Introductions 0 03-21-2005 04:48 AM


All times are GMT -7. The time now is 12:49 AM.

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