#1  
Old 11-18-2011, 06:42 AM
Serf
 
Join Date: Nov 2009
Location: London
Posts: 15
Default Reflective covering under dome insulation

Has anyone used a reflective covering such as aluminium foil over the dome underneath the insulating layer to reflect heat back to the oven?

The idea comes from seeing a lot of thermal insulation for buildings with a silver reflective coating on them. Presumably this is to reflect heat?

Any thoughts?
Reply With Quote
  #2  
Old 11-18-2011, 10:34 AM
Ken524's Avatar
Il Pizzaiolo
 
Join Date: May 2007
Location: Kentucky
Posts: 1,650
Default Re: Reflective covering under dome insulation

Aluminum foil over the dome is a waste of time (and aluminum). It reacts with the refractory products you use to build the dome and disintegrates. Save your foil for wrapping up the leftover pizza!

Here's a post by Dmun about this subject from a different thread:

Quote:
Originally Posted by dmun View Post
The aluminum foil idea has been debunked again and again. There's no use for it in oven building except to create a non-adhesion layer between different masonry parts, for a slip plane. Since it decays in the presence of the corrosive mortar, it doesn't have any heat reflective properties.
__________________
Ken H. - Kentucky
42" Pompeii


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


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.


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 11-18-2011, 12:22 PM
david s's Avatar
Il Pizzaiolo
 
Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 4,840
Default Re: Reflective covering under dome insulation

Because the foil is in contact with the dense inner dome it will conduct heat through it. For a foil layer to work it would need to be surrounded with air. I tried a foil layer between my vermicrete layer and under the outer stucco/rendered outer shell in an effort retain moisture in the outer shell when it cured. I wish I hadn't because it tends to lock moisture in the oven making removal of moisture more difficult. Fortunately I made lots of pin pricks through the foil layer in two patches about 3" in diam. Now after long periods of tropical rain when refiring the oven these patches get quite hot on the outside while the rest of the oven is only warm on the outside. This indicates to me that water/steam is passing through those holes and super heating the outer shell at those points. It is also a gret indicator that my oven is dry when those spots are no longer hot, but the same as the rest of the outer shell. It is not too much of a drama, a few long slow fires gets the oven back to normal working condition, but it does take longer than if I hadn't used the foil. It also indicates to me that the foil has not disintegrated. Perhaps being outside the insulating layer where it is a bit cooler has prevented it from corroding.

Last edited by david s; 11-18-2011 at 12:28 PM. Reason: Typo
Reply With Quote
  #4  
Old 11-18-2011, 11:38 PM
Serf
 
Join Date: Nov 2009
Location: London
Posts: 15
Default Re: Reflective covering under dome insulation

Thanks for the feedback, makes sense, saved me from making a mistake, great forum.
Reply With Quote
Reply

Tags
insulation, reflective coating

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
Steel Dome Oven Wiley Other Oven Types 195 01-14-2014 11:06 PM
Dome Insulation? RyH Modular Refractory Oven Installation 14 12-29-2009 03:50 AM
Exterior Dome Construction Bandrasco Pompeii Oven Construction 19 10-26-2008 06:26 AM
best method for perlite insulation on dome builder brad Getting Started 2 09-17-2008 03:44 AM
Dome Insulation jamesdifede Design Styles, Chimneys and Finish 14 04-08-2008 07:20 AM


All times are GMT -7. The time now is 08:39 AM.

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