#1  
Old 02-18-2011, 02:16 AM
Serf
 
Join Date: Feb 2011
Location: uk
Posts: 2
Default materials

A few questions about materials:

1. Vermiculite versus Perlite: is one better than the other?
2. If using Vermiculite, what granule size is best for (1) lightweight concrete, (2) mortar and (3) loose insulation between the dome and outside structure?
3. If using self mix mortar does it matter what type of sand is used?
4. Most fire bricks I've seen advertised are 42% alumina: is this OK for floor and dome?
5. If using regular clay bricks rather than fir bricks for dome, what mortar mix should be used?

Thanks, in advance, for any replies.

Chris Bowman (in the UK)
Reply With Quote
  #2  
Old 02-18-2011, 09:43 PM
brickie in oz's Avatar
Il Pizzaiolo
 
Join Date: Mar 2009
Location: Whittlesea
Posts: 3,455
Default Re: materials

Do a search on the forums, its all been done before.
Here is the first question search results I came up with so no doubt the rest have been answered before too.

http://www.fornobravo.com/forum/f6/v...lend-5932.html (Vermiculite vs. Perlite vs. blend)
__________________
The English language was invented by people who couldnt spell.


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 02-19-2011, 05:59 AM
dmun's Avatar
Moderator
 
Join Date: Jul 2005
Location: New Jersey USA
Posts: 4,216
Default Re: materials

Quote:
1. Vermiculite versus Perlite: is one better than the other?
No.
Quote:
2. If using Vermiculite, what granule size is best for (1) lightweight concrete,...and (3) loose insulation between the dome and outside structure?
Unlike some categories of human endeavor, size doesn't matter.
Quote:
(2) mortar
Vermiculite/perlite isn't used in mortar.
Quote:
4. Most fire bricks I've seen advertised are 42% alumina: is this OK for floor and dome?
At the temperatures that we run at, the alumina content isn't particularly important. Don't pay more for high alumina bricks.
Quote:
5. If using regular clay bricks rather than fir bricks for dome, what mortar mix should be used?
For the best/cheapest mortar for dome construction, search for "homebrew mortar (Mortar Choice)"
Don't use plain clay bricks if you can at all avoid it. It's a ton of work to build a brick oven, and saving a few pennies may be short sighted.
__________________
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
  #4  
Old 02-19-2011, 11:59 AM
david s's Avatar
Il Pizzaiolo
 
Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 4,705
Default Re: materials

Vermiculite versus Perlite: is one better than the other?

I think there is some variation in the two materials depending where it comes from. I weighed a 100 L bag of vermiculite and it was 9.0 Kg and the same size bag of perlite was 7.5 Kg This is a significant difference. This perlite contains more air and therefore a better insulator.The perlite is a little dearer here and for preference I like to use vermiculite because it is a bit easier to mix and doesn't create irritating dust like perlite.
Check the thermal conductivity of the two materials.
Reply With Quote
  #5  
Old 02-19-2011, 03:09 PM
GianniFocaccia's Avatar
Il Pizzaiolo
 
Join Date: Jun 2009
Location: Disneyland, CA
Posts: 1,373
Default Re: materials

As a general rule, the bigger the joint, the bigger the grain of sand needed. Since smaller joints are desirable in an oven, this requires a smaller grain. For one who has a small inside joint with a large outside (ie: a triangular-jointed soldier joint) it has been recommended to employ two kinds of mortar. Tscarborough, in one of his FB posts here, describes building the optimum mortar using multiple grain sizes in a single mortar akin to filling a jar with golf balls, then marbles, then ball bearings.

Last edited by GianniFocaccia; 02-19-2011 at 03:39 PM.
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
Finding local building materials james Finding Building Materials 53 01-17-2014 04:30 AM
materials in Sacramento cynon767 Finding Building Materials 1 11-19-2009 08:31 PM
Where to get materials in NW Arkansas? ArkansasOven Getting Started 4 10-27-2009 08:22 PM
Materials in RI And Eastern CT - Where I bought dinoforno Pompeii Oven Construction 4 08-11-2009 07:57 AM
Plans & materials before stand? dbhansen Getting Started 1 09-06-2007 10:10 AM


All times are GMT -7. The time now is 12:59 PM.

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