#11  
Old 06-02-2014, 07:56 AM
UtahBeehiver's Avatar
Il Pizzaiolo
 
Join Date: May 2012
Location: Salt Lake City, Utah
Posts: 1,564
Default Re: Design Help

Neil,

I have been following your thread with Gulf, he knows what he is talking about. Vcrete is a decent insulator but not as effective as CaSi board (floor) or ceramic fiber blanket (dome) so the Vcrete has to be thicker to achieve the same level of CF thermal insulation. Nothing wrong with Vcrete, just to plan accordingly for the added thickness. I have 4" CaSi/FoamGlas on floor and 3" of CF plus 2" of Vcrete on dome. Oven holds heat for 4-5 days with outside of dome at ambient air temperature.
Reply With Quote
  #12  
Old 06-02-2014, 01:08 PM
Serf
 
Join Date: May 2014
Location: Johannesburg, RSA
Posts: 17
Default Re: Design Help

Quote:
Originally Posted by UtahBeehiver View Post
Neil,

I have been following your thread with Gulf, he knows what he is talking about. Vcrete is a decent insulator but not as effective as CaSi board (floor) or ceramic fiber blanket (dome) so the Vcrete has to be thicker to achieve the same level of CF thermal insulation. Nothing wrong with Vcrete, just to plan accordingly for the added thickness. I have 4" CaSi/FoamGlas on floor and 3" of CF plus 2" of Vcrete on dome. Oven holds heat for 4-5 days with outside of dome at ambient air temperature.
Thanks for the info mate !

I cannot find anything other than Vcrete so i think it will have to do ....

What do you think of the clay brick and firebrick layer?
Reply With Quote
  #13  
Old 06-02-2014, 01:17 PM
Journeyman
 
Join Date: Mar 2011
Location: Bucks County, PA
Posts: 288
Default Re: Design Help

Just curious, why are you using 1" firebrick plus a layer of clay brick? Seems like a lot of extra work; you are essentially building two domes. Why not just using a single layer of full firebrick. I am guessing either cost/availability of full firebricks.

Also, is your slab supported in the middle in any way?
Reply With Quote
  #14  
Old 06-02-2014, 01:29 PM
UtahBeehiver's Avatar
Il Pizzaiolo
 
Join Date: May 2012
Location: Salt Lake City, Utah
Posts: 1,564
Default Re: Design Help

Neil,

I believe you are building a barrel, so the two layers are not near as complex cutting as a dome. The total brick thickness is just under 5" so a little thicker on the barrel and quite a bit more on the floor. It may take a little more fuel to fire the oven but you use what you have to work with. I have no scientific documentation but the word of mouth is Vcrete is about 1/2 the thermal efficiency of a CF blanket. So 6" Vcrete equal to about 3" CF. Again, like Gulf says and your latest sketch, insulate the barrel, floor, and walls away from the reinforced concrete hearth.
Reply With Quote
  #15  
Old 06-03-2014, 01:32 AM
Serf
 
Join Date: May 2014
Location: Johannesburg, RSA
Posts: 17
Default Re: Design Help

Quote:
Originally Posted by jeeppiper View Post
Just curious, why are you using 1" firebrick plus a layer of clay brick? Seems like a lot of extra work; you are essentially building two domes. Why not just using a single layer of full firebrick. I am guessing either cost/availability of full firebricks.

Also, is your slab supported in the middle in any way?
Cost is the driver here, a full firebrick is around $3 here whereas a tile is around $0.60 so a massive difference
Reply With Quote
  #16  
Old 06-03-2014, 01:34 AM
Serf
 
Join Date: May 2014
Location: Johannesburg, RSA
Posts: 17
Default Re: Design Help

Quote:
Originally Posted by UtahBeehiver View Post
Neil,

I believe you are building a barrel, so the two layers are not near as complex cutting as a dome. The total brick thickness is just under 5" so a little thicker on the barrel and quite a bit more on the floor. It may take a little more fuel to fire the oven but you use what you have to work with. I have no scientific documentation but the word of mouth is Vcrete is about 1/2 the thermal efficiency of a CF blanket. So 6" Vcrete equal to about 3" CF. Again, like Gulf says and your latest sketch, insulate the barrel, floor, and walls away from the reinforced concrete hearth.
Thanks UtahB, yes i am building a dome. I will put as much Vcrete as i can on the base ...
Reply With Quote
  #17  
Old 06-03-2014, 07:15 AM
UtahBeehiver's Avatar
Il Pizzaiolo
 
Join Date: May 2012
Location: Salt Lake City, Utah
Posts: 1,564
Default Re: Design Help

I guess nomenclature confusion, dome to me is an igloo, vault and barrel to me are the same so if you are building a vault or barrel then you brick work will be much easier with the two layers of brick.
Reply With Quote
  #18  
Old 06-03-2014, 08:19 AM
Tscarborough's Avatar
Il Pizzaiolo
 
Join Date: Oct 2009
Location: Ausitn
Posts: 3,128
Default Re: Design Help

I built my vault out of 2 layers of 1-1/2" firebrick. I also cut them in half lengthwise to reduce the gaps even more. Be sure to fully bed the second layer onto the first; any gaps will act as an insulator.

Reply With Quote
  #19  
Old 06-03-2014, 08:42 AM
UtahBeehiver's Avatar
Il Pizzaiolo
 
Join Date: May 2012
Location: Salt Lake City, Utah
Posts: 1,564
Default Re: Design Help

Ahh, Tscar's, pic shows more than words can describe.
Reply With Quote
  #20  
Old 06-04-2014, 02:53 AM
Serf
 
Join Date: May 2014
Location: Johannesburg, RSA
Posts: 17
Default Re: Design Help

Thanks for the comments and support guys.

Attached is the latest version of my design

this is a schematic and not strictly to scale

the chimney is not shown on the sketch but will come out of the entrance arch as shown in the blue arrow.

the insulation is thicker than shown and will be a Vcrete mix

also not shown is the vcrete over the outside of the vault itself

At the moment I have built the stand and thrown the concrete slab, this weekend will hopefully be the Vcretre, wall buttress and base laying ....
Attached Thumbnails
Design Help-picture2.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
My Pompeii Design snyderadam Heat Management 37 09-22-2014 07:53 PM
42" Build Geelong AUS - Curved Stand (based on Maburton's design) Memphis Getting Started 0 01-07-2014 12:56 AM
Russian oven design, unusual hearth floor. Turkish gambit Getting Started 0 02-04-2013 08:50 PM
Commercial oven design... what is best? Stone Mason1 Commercial Pizza Ovens 5 01-09-2012 04:42 AM
Pompei Oven Base in Winterland - Floating Design tdibratt Getting Started 1 07-09-2008 08:42 AM


All times are GMT -7. The time now is 08:49 PM.

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