#1  
Old 06-13-2007, 08:32 AM
Serf
 
Join Date: Jun 2007
Location: UK
Posts: 23
Default Advice re the insulating hearth

Hello I have a question about the Insulating Hearth: does it matter if the vermiculite insulating concrete layer is poured onto the structural concrete once it is dry? I notice that the guidelines here suggest doing it at the same time so it all bonds together, but unfortunately I discovered this forum too late and have already done the structural layer!

If it is too late for me to add the vermiculite layer I was thinking of using the Superisol block instead. Does anyone know if this is available in the UK?

Any help would be much appreciated! Thanks.
Reply With Quote
  #2  
Old 06-13-2007, 09:40 AM
dmun's Avatar
Moderator
 
Join Date: Jul 2005
Location: New Jersey USA
Posts: 4,216
Default Re: Advice re the insulating hearth

There is no problem laying the vermiculate concrete after the support slab is dried. Even if it's completely detached (which it won't be - the water and concrete settle to the bottom) it doesn't matter. All the force is down.

The main difference between calcium silicate block or equivilant, and vermiculite/perlite concrete, is that you can get away with two inches of insulation rather than four.
Reply With Quote
  #3  
Old 06-13-2007, 09:46 AM
james's Avatar
Brick Oven Merchant
 
Join Date: Mar 2005
Location: Pebble Beach, CA
Posts: 4,648
Default Re: Advice re the insulating hearth

David has it right.

We are looking for a source of Cal Sil (or Alu Sil) boards in the UK and will let you know when we find something. For now, you can definitely pour a 4" vermiculite layer on top of a curing slab. Gravity is on your side. The comments about same day pour go back to the very, very early days, when some builders were putting the vermiculite layer under the slab, and hanging the whole thing with rebar.

If anyone finds "pour the same day" mentions on FB.com, let me know, and I will delete them.

James
__________________

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.

Last edited by james; 06-13-2007 at 12:45 PM.
Reply With Quote
  #4  
Old 06-13-2007, 10:01 AM
Serf
 
Join Date: Jun 2007
Location: UK
Posts: 23
Default Re: Advice re the insulating hearth

Thats great, thanks for getting back to me so quickly, very reassuring.

FYI: I got the "same day pour advice" from:
fornobravo.com/pizza_oven_installation/insulating_hearth.html

where it states "It is important to pour both the insulating and thermal layers in the same days, as you want them to bond and cure together".

Thanks again for the information. Really helpful.

Simon
Reply With Quote
  #5  
Old 06-13-2007, 11:44 AM
JoeT62's Avatar
Apprentice
 
Join Date: May 2007
Location: Massachusetts
Posts: 174
Default Re: Advice re the insulating hearth

Excellent! I was planning on pouring the same day, but a staged approach will let me get them both done sooner (I have to squeeze construction hours in whenever I can).
Reply With Quote
  #6  
Old 06-13-2007, 03:20 PM
Il Pizzaiolo
 
Join Date: Jan 2007
Location: Tampa, FL
Posts: 1,446
Default Re: Advice re the insulating hearth

WOW! Wish this had come up 3 months ago. I followed the instructions to the letter. Made sense at the time, so I didn't ask. I then proceeded to mix ALL of my concrete by hand (yes, pretty stupid, I'm not 1/2 the man I thought I was) and do BOTH pours the same day. I can't believe I didn't have a stroke and a heart attack.....the 1 week wait for curing allowed my back and shoulders time to recover.
I'm not an advocate of hand mixing, but it sure would have been easier knowing I could have taken a break between the 2 pours.
Reply With Quote
  #7  
Old 06-14-2007, 05:45 AM
james's Avatar
Brick Oven Merchant
 
Join Date: Mar 2005
Location: Pebble Beach, CA
Posts: 4,648
Default Re: Advice re the insulating hearth

RT,

I feel terrible. But look on the bright side -- your hearth did fuse, and it will be that way forever. Hope your back has recovered.

If it helps (which I know it doesn't), I have changed that page on the web-site plans. Sorry about that again.

James
__________________

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
  #8  
Old 06-14-2007, 07:04 AM
Il Pizzaiolo
 
Join Date: Jan 2007
Location: Tampa, FL
Posts: 1,446
Default Re: Advice re the insulating hearth

James,

no apology needed. My ego (I can do anything) got the better of me and I proceeded to mix 60 bags of concrete by hand. I struggled with the rental/buying options of a mixer, then said screw it and just started mixing.

Having the option to pour them separately would have been nice, but the more I think about it, the more satisfied I am that my oven is as structurally sound as it can possibly be.
Reply With Quote
  #9  
Old 06-14-2007, 08:17 AM
DrakeRemoray's Avatar
Il Pizzaiolo
 
Join Date: Mar 2006
Location: Littleton, CO
Posts: 1,211
Default Re: Advice re the insulating hearth

I did the same thing (pour both on the same day). My next door neighbor pulled me out of the fire on that day. He and his son came over and really really helped. I am sure I would not have been able to do it without them.

So pretty much every time I make pizza I either invite them over or at least hand one over the fence!

Drake
Reply With Quote
  #10  
Old 08-19-2007, 10:27 PM
Serf
 
Join Date: Aug 2007
Location: gardendale
Posts: 13
Default Re: Advice re the insulating hearth

I poured both today. How long do I have to wait to start laying the cooking floor?
Also, What is the best way to cut your forms using foam and how to you get them to stay in place?
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
Insulating Hearth Too Big, no room for anchors Chris Pompeii Oven Construction 7 03-07-2007 06:33 AM
Curb around the insulating hearth material Jack Chastain Pompeii Oven Construction 1 10-15-2006 11:29 AM
Insulating Hearth Question mrpbjnance Pompeii Oven Construction 20 08-21-2006 03:03 PM
Insulating Hearth John Hurley Modular Refractory Oven Installation 4 07-21-2006 09:16 AM
re insulating hearth rocco Getting Started 7 05-14-2006 06:08 AM


All times are GMT -7. The time now is 05:15 AM.

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