#1  
Old 11-17-2012, 09:30 AM
Laborer
 
Join Date: Nov 2012
Location: Athens, WI
Posts: 75
Default A few questions about hearth insulation and mass

Hello all!

I am beginning to build a 36" pompeii. I already have the base poured and am ready for the hearth insulation.

Question 1: Does 4" of vermiculite concrete have about as much insulation value as 2" of FB board or SuperIsol?

Question 2: I have some firebrick splits around from a maple syrup evaporator I no longer use and am wondering about putting a layer of them under the the regular size hearth brick for some added mass. We are big bread fans in addition to pizza lovers and I thought a little more mass might be nice for baking bread. And it seems to me like having close to the same amount of mass on the hearth as there is on the dome would make sense. Am I right or wrong? Also......could anyone give me an idea of how much longer it would take to heat the oven with this added mass?

This is a great forum and I am so glad I found it before I started on a Allan Scott oven which would've had way too much mass for me!

Thanks
Reply With Quote
  #2  
Old 11-20-2012, 05:36 AM
Laborer
 
Join Date: Nov 2012
Location: Athens, WI
Posts: 75
Default Re: A few questions about hearth insulation and mass

OK....I decided to use calcium silicate boards for insulating the hearth. But, I'm still wondering about adding mass under the hearth. Especially in relation to baking bread. Does anyone have any advice or other input to give me about it?
Reply With Quote
  #3  
Old 11-20-2012, 07:29 AM
Tscarborough's Avatar
Il Pizzaiolo
 
Join Date: Oct 2009
Location: Ausitn
Posts: 3,111
Default Re: A few questions about hearth insulation and mass

If you want more mass, you can turn the firebrick on their sides for the floor, giving you 4.5" of mass, but unless you plan on multiple batches, you will spend more time firing than it is worth.
Reply With Quote
  #4  
Old 11-20-2012, 07:39 AM
UtahBeehiver's Avatar
Il Pizzaiolo
 
Join Date: May 2012
Location: Salt Lake City, Utah
Posts: 1,947
Default Re: A few questions about hearth insulation and mass

Hi Geek,

Ask this question in the Pompeli Oven Construction tab. It is much more active. But to answer your question, at least from my perspective. I have 2" of FoamGlass topped with 1 1/2" of CaSi with a 3" thick high density fire brick floor. The HD bricks and increased thickness seems take longer to saturate but once charged they also seem to hold the floor heat. I would think 2" of CaSi is your min. There is no significant insulation gained by the splits but does add mass consider more CaSi or a V-crete layer under CaSi. My two cents.
__________________
Russell

Experiences are the names I call my mistakes!

Link to my build -
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


My Picassa Picture Log
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 11-20-2012, 08:15 AM
Laborer
 
Join Date: Nov 2012
Location: Athens, WI
Posts: 75
Default Re: A few questions about hearth insulation and mass

Quote:
Originally Posted by Tscarborough View Post
If you want more mass, you can turn the firebrick on their sides for the floor, giving you 4.5" of mass, but unless you plan on multiple batches, you will spend more time firing than it is worth.
Thanks so much for your input. I thought about using bricks on the side but I already have the splits and so it would be more cost effective to use them instead.
The way I perceive we will be using the oven is this: Starting with pizza then after that one or two batches of bread then possibly on occasion some smaller pastries. would the standard 2.5" hearth handle that fine?

Quote:
Originally Posted by UtahBeehiver View Post
Hi Geek,

Ask this question in the Pompeli Oven Construction tab. It is much more active. But to answer your question, at least from my perspective. I have 2" of FoamGlass topped with 1 1/2" of CaSi with a 3" thick high density fire brick floor. The HD bricks and increased thickness seems take longer to saturate but once charged they also seem to hold the floor heat. I would think 2" of CaSi is your min. There is no significant insulation gained by the splits but does add mass consider more CaSi or a V-crete layer under CaSi. My two cents.
Thanks for the tip about the thread location! I really should start a proper build thread with pics so I can just ask questions there. I will have enough CaSi board for more than 2" so I think I'll be fine there.

I'm still wondering if more floor heat is better for bread or doesn't it really make that much of a difference?
Reply With Quote
  #6  
Old 11-21-2012, 04:11 PM
Apprentice
 
Join Date: Sep 2010
Location: Mesa, AZ
Posts: 235
Default Re: A few questions about hearth insulation and mass

Standard hearth will easily handle what you're describing. When people talk about "multiple batches" of bread, they usually mean production-level quantities, not the 10kgs (20 one pound loaves) you're going to bake in two batches.
Reply With Quote
  #7  
Old 11-26-2012, 02:10 PM
Laborer
 
Join Date: Nov 2012
Location: Athens, WI
Posts: 75
Default Re: A few questions about hearth insulation and mass

Quote:
Originally Posted by azatty View Post
Standard hearth will easily handle what you're describing. When people talk about "multiple batches" of bread, they usually mean production-level quantities, not the 10kgs (20 one pound loaves) you're going to bake in two batches.
Awesome! Thanks!
Reply With Quote
  #8  
Old 11-27-2012, 12:01 AM
Apprentice
 
Join Date: Jan 2010
Location: Houston
Posts: 192
Default Re: A few questions about hearth insulation and mass

Adding mass under the floor as you suggest will result in slower heat up of your oven floor and negate the usefullness of your insulation to a point. Think of it this way. The added mass will heat up only by drawing the heat away from your floor. The insulation under your "mass" will allow for longer heat retention but will do nothing to aid in the heating of your floor. As for baking breads (I too am a fan) I don't think that the added mass that you are talking about will be that benifitial, but of course I don't know what your plans are. Just saying that I have been able to use my oven to bake bread after I was done with making pizzas.
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
New member.. Vermiculite insulation and other questions victorsee Introductions 3 07-09-2011 09:05 AM
Hearth Floor Questions (More) SloW8 Newbie Forum 1 05-28-2010 03:03 PM
Low heat mass / high insulation 36" ohthetrees Pompeii Oven Construction 0 04-03-2010 12:15 PM
High Mass, Low Mass? pjk Newbie Forum 5 11-16-2007 03:27 AM
Questions re: cladding and insulation George_in_MA Pompeii Oven Construction 7 01-03-2006 04:38 PM


All times are GMT -7. The time now is 10:15 AM.

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