#1  
Old 05-28-2010, 01:12 PM
Serf
 
Join Date: May 2010
Location: Utah
Posts: 3
Default Hearth Floor Questions (More)

Sorry, I know some of these are a bit redundant, but I am new and have a small brain. I plan on using 2x8's to make a form for my hearth.

1. If I put down 3.5" of concrete with rebar is that good enough for strength? (54"x54" square with a span of 42")

2. If I fill the rest of the form up with vermiculete, is that enough insulation?

3. Then I put my fire brick for the floor of the oven on top of the hearth. Can I use splits and lay them "flat" or do I need to lay them on edge to get enough mass for the floor?


T.I.A.

Joe
Reply With Quote
  #2  
Old 05-28-2010, 03:03 PM
kebwi's Avatar
Il Pizzaiolo
 
Join Date: Aug 2009
Location: Seattle, WA, USA
Posts: 1,010
Default Re: Hearth Floor Questions (More)

2x8" are 7.5" wide. Assuming your frame overlaps the support wall by, say, two inches, you're look at 5.5" total fillable height. If you fill 3.5" of concrete that's only 2" of vermicrete. Vermicrete is a decent insulator at high thicknesses but it isn't all that great. It isn't like the fancy ceramic insulating materials. I doubt if 2" of vermicrete is much good at all frankly. I would recommend a minimum of 4" of rebar concrete (that's about what I did) and at least another four inches of vermicrete if you aren't planning on using any other form of floor insulation, more would be better.

Splits are not thick enough for an oven floor. Double them up to get normal face-up firebrick thickness, which is how most of us lay our floor. You could get three splits high if you wanted a little more thermal mass on the floor.
__________________

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

WFO Webpage:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

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

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
Hearth Bread=Hearth Aroma? timo Hearth Bread and Flatbread 18 11-27-2009 03:44 AM
Before I pour...hearth question Pizza Freak Getting Started 7 05-21-2008 12:59 PM
Thermal Expansion Question - Dome vs Hearth Kemo Pompeii Oven Construction 14 10-03-2007 12:18 PM
Between Hearth SLAB and Hearth BRICKS, slip plane. Marcel Newbie Forum 2 09-12-2005 05:35 PM
Spanning the wood storage below the Hearth slab. Marcel Getting Started 0 08-22-2005 09:13 PM


All times are GMT -7. The time now is 09:51 PM.

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