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  #111  
Old 10-12-2011, 11:44 AM
Serf
 
Join Date: Jul 2011
Location: Tacoma, WA
Posts: 5
Default Re: Insulation Efficiency

Hi, I mixed my insulating hearth layer 5 parts vermi to 1 part portland with just enough water to allow it to hold together as a clump in your hand when squeezed.
The problem is that after 3 days it is still slightly spongy, is this normal?
Will it ever become hard?
Thanks , Kyle
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  #112  
Old 10-12-2011, 02:07 PM
Journeyman
 
Join Date: Jun 2008
Location: Melbourne Australia
Posts: 399
Default Re: Insulation Efficiency

It will never have the MPa that normal concrete gets, iit is an insulative material so it will be softish/crumbly. but, will be fine for building upon.
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  #113  
Old 10-12-2011, 05:07 PM
Serf
 
Join Date: Jul 2011
Location: Tacoma, WA
Posts: 5
Default Re: Insulation Efficiency

Thanks! Tha is what I was thinking but just waned to check before I go to he next step of laying down the floor.
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  #114  
Old 10-12-2011, 05:08 PM
Serf
 
Join Date: Jul 2011
Location: Tacoma, WA
Posts: 5
Default Re: Insulation Efficiency

Sorry about the missing "t's" in that last post.
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  #115  
Old 11-18-2011, 05:21 PM
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Il Pizzaiolo
 
Join Date: Sep 2011
Location: Mississippi
Posts: 1,398
Default Re: Insulation Efficiency

I have poured a 4" (5 to1 ) vemiculite and portland insulation layer on my hearth. Since then, I have been given enough 2" calcium silicate board to cover the oven floor area. Is this material (which seems to be every bit as substantial as the vermicrete and has a rating of 1280 degrees) suitable for the floor of a WFO?
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  #116  
Old 11-18-2011, 05:33 PM
Serf
 
Join Date: Oct 2010
Location: Australia
Posts: 15
Default Re: Insulation Efficiency

yep thats the stuff, it's almost made for it! Have a great time building it.
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  #117  
Old 11-18-2011, 05:39 PM
Serf
 
Join Date: Oct 2010
Location: Australia
Posts: 15
Default Re: Insulation Efficiency

here are some pics of our oven with bricks laid on top in herringbone fashion.
Attached Thumbnails
Insulation Efficiency-img_0875.jpg   Insulation Efficiency-img_0877.jpg  
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  #118  
Old 11-18-2011, 06:08 PM
Gulf's Avatar
Il Pizzaiolo
 
Join Date: Sep 2011
Location: Mississippi
Posts: 1,398
Default Re: Insulation Efficiency

Thanks Tinaloven,
I'm starting tomorrow on the floor. I hope, that between the 4" of vermicrete and the 2" of "calsil", I have the floor insulation covered.

PS: The muticolored red firebrick look great. I have to settle for yellow "clones".

Last edited by Gulf; 11-18-2011 at 06:28 PM. Reason: more info
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  #119  
Old 11-18-2011, 08:15 PM
david s's Avatar
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Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 4,516
Default Re: Insulation Efficiency

Quote:
Originally Posted by Gulf View Post
I have poured a 4" (5 to1 ) vemiculite and portland insulation layer on my hearth. Since then, I have been given enough 2" calcium silicate board to cover the oven floor area. Is this material (which seems to be every bit as substantial as the vermicrete and has a rating of 1280 degrees) suitable for the floor of a WFO?
No, it is not suitable for the floor of a WFO, but it is suitable to use under the floor. If you got it free why not place a 2" layer of it over the vermicrete then use your firebricks over the top. Then you will have an extremely well insulated floor. 2" of Cal. Sil. Board is approx. twice as good an insulator as the 4" 5:1 vermicrete. But you will end up with the floor 2" higher than you had planned.
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  #120  
Old 11-19-2011, 05:00 AM
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Il Pizzaiolo
 
Join Date: Sep 2011
Location: Mississippi
Posts: 1,398
Default Re: Insulation Efficiency

Installing under fire brick for sure. I have seen references to FB board, ceramic fiber board, etc. I just wasn't sure if calcium silicate was appropriate for insulating the floor. I'm glad to find out that it is. I'll proceed and install it on top of the vermicrete.

Thanks tinaloven and david s
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