Go Back   Forno Bravo Forum: The Wood-Fired Oven Community > Pizza Oven Design and Installation > Finding Building Materials

Like Tree12Likes

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 01-31-2013, 06:44 AM
Serf
 
Join Date: Nov 2012
Location: Kampala, Uganda
Posts: 2
Default Alternative Insulation

Hello cooks and cobblers!

I am attempting to build a wood fire oven in Uganda (part 2?). I live in Kampala, the capital city, and building materials are a bit easier to find than the other East African threads I've seen here. However I'm having trouble finding vermiculite or perlite. Ironically Uganda has a mine which produces vermiculite for export (an australian company) however I've been in touch with them and they have informed me the mine has ceased production and they can't provide it to me.

I've seen other suggestions here like woven ceramic but so far I haven't had luck in finding that in Kampala either.

I'd appreciate suggestions of more commonly available materials that could function as decent insulating material.

Thanks!
Reply With Quote
  #2  
Old 01-31-2013, 02:36 PM
TropicalCoasting's Avatar
Journeyman
 
Join Date: Dec 2011
Location: Qld
Posts: 316
Default Re: Alternative Insulation

People have traditionally used straw, sand, clay and sawdust for insulating kilns.
There was talk of using lava stone "scoria" in the cement mix hear too.
If you enclose your dome you can use glass bottles on top or anything that wont melt but traps air.
Reply With Quote
  #3  
Old 01-31-2013, 04:05 PM
Master Builder
 
Join Date: May 2011
Location: South Australia
Posts: 550
Default Re: Alternative Insulation

Scoria, or pumice if you can get it. Lots of air holes in those little rocks, and when you make concrete with scoria as the coarse aggregate, the air holes get sealed over by, but do not fill up with, the cement and sand paste. It worked for me. My floor sits on it, the dome is covered with vermicrete, I seem to have no trouble getting the floor very hot.
Failing that, the dome could be covered with a mix of sawdust and clay, when the sawdust burns away you have aerated clay insulation.
Reply With Quote
  #4  
Old 01-31-2013, 09:51 PM
brickie in oz's Avatar
Il Pizzaiolo
 
Join Date: Mar 2009
Location: Whittlesea
Posts: 3,455
Default Re: Alternative Insulation

Quote:
Originally Posted by TropicalCoasting View Post
you can use glass bottles on top or anything that wont melt but traps air.
Sorry but I still fail to see how glass bottles can thermally insulate, if you heat glass up it glows until it melts, each adjacent bottle would also get hot and so on.
In the end you would end up with hot glass bottles sucking all the heat away.

Or am I missing something?
__________________
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
  #5  
Old 02-01-2013, 12:05 AM
Laurentius's Avatar
Master Builder
 
Join Date: Nov 2010
Location: Japan
Posts: 843
Default Re: Alternative Insulation

No, You don't miss much. I stand corrected, you miss, misinformation.
Reply With Quote
  #6  
Old 02-01-2013, 12:11 AM
brickie in oz's Avatar
Il Pizzaiolo
 
Join Date: Mar 2009
Location: Whittlesea
Posts: 3,455
Default Re: Alternative Insulation

Quote:
Originally Posted by Laurentius View Post
No, You don't miss much. I stand corrected, you miss, misinformation.

What the....?
__________________
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
  #7  
Old 02-01-2013, 02:16 AM
Laurentius's Avatar
Master Builder
 
Join Date: Nov 2010
Location: Japan
Posts: 843
Default Re: Alternative Insulation

Quote:
Originally Posted by brickie in oz View Post
What the....?
It means that your statement is true. It means the glass bottles have proven to be a good insulation in the construction of so call earth houses, thick walled(1&2 meters thick) adobe houses, using, straw, bottles, shredded car tires and other things to trap air pockets for insulation. The misinformation is that the insulation properties of those thing applies across the board to heaters, kiln, ovens and furnaces.
Reply With Quote
  #8  
Old 02-01-2013, 02:24 AM
david s's Avatar
Il Pizzaiolo
 
Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 4,701
Default Re: Alternative Insulation

[QUOTE=
If you enclose your dome you can use glass bottles on top or anything that wont melt but traps air.[/QUOTE]

It is the air that does the insulating. The volume of air inside the volume of a bottle is way more than the volume of the glass. Plus you get extra air spaces between the bottles. It is all about the resulting density of the layer. Glass is not a great insulator on its own but add a large quantity of air to it and it becomes a good insulator. Fibreglass insulating batts, which are made of glass are another good example. Likewise ceramic fibre blanket which uses clay fibres separated by air.neither glass nor clay are wonderful insulators but when combined with lots of air they are.
If you have free bottles then you have free insulation.

Last edited by david s; 02-01-2013 at 07:21 PM.
Reply With Quote
  #9  
Old 02-01-2013, 06:34 AM
TropicalCoasting's Avatar
Journeyman
 
Join Date: Dec 2011
Location: Qld
Posts: 316
Default Re: Alternative Insulation

A mate built a corrugated iron ring around his dome and filled it full of stubbies over 1 metre high over the dome.
His oven definitely holds its heat
Reply With Quote
  #10  
Old 02-01-2013, 10:28 AM
Laurentius's Avatar
Master Builder
 
Join Date: Nov 2010
Location: Japan
Posts: 843
Default Re: Alternative Insulation

Quote:
Originally Posted by david s View Post
It is the air that does the insulating. The volume of air inside the volume of a bottle is way more than the volume of the glass. Plus you get extra air spaces between the bottles. It is all about the resulting density of the layer. Glass is not a great insulator on its own but add a large quantity of air to it and it becomes a good insulator. Fibreglass insulating batts are another good example. Likewise ceramic fibre blanket which uses clay fibres separated by air.
Why can't you just make a Void, its full of air?
brickie in oz likes this.
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
Mold growth on insulation quirkzoo Pompeii Oven Construction 0 09-02-2012 03:45 PM
alternative cheap insulation? catacomb Pompeii Oven Construction 15 07-07-2011 03:19 PM
Alternative insulation Jason79 Tools, Tips and Techniques 4 06-28-2011 10:33 AM
Blanket Insulation altamont Pompeii Oven Construction 12 10-01-2009 08:09 AM
alternative insulation??? danqui Other Oven Types 15 09-04-2009 12:58 PM


All times are GMT -7. The time now is 12:13 AM.

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