#1  
Old 03-17-2009, 11:25 PM
Serf
 
Join Date: Mar 2009
Location: Sydney
Posts: 1
Cool Vermiculite concrete under brick arch

Hi everyone,
Quick question- I have built my oven base on a thick slab and then made a 12cm slab on top of the base bricks, I would like to add a concrete vermiculite mix on top of that slab/underneath my oven floor for heat retention... here the question: will the vermiculite concrete be strong enough to hold the brick arch and floor tiles? I had a look at vermiculite yesterday and it seems very light... Do I have to put another layer of concrete on top for stability? Thanks for your help…
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  #2  
Old 03-18-2009, 12:07 PM
james's Avatar
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Join Date: Mar 2005
Location: Pebble Beach, CA
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Default Re: Vermiculite concrete under brick arch

Hello,

I moved this to Getting Started, so you can get more input. The short answer is Yes.

Vermiculite is pretty odd stuff (it's basically volcanic popcorn), and it does seem light and not very stable, but is will set and become solid and it has very, very good compression strength. Your oven will be solid!
James
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Old 03-23-2009, 04:59 PM
Serf
 
Join Date: Mar 2009
Location: Sydney
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Smile Re: Vermiculite concrete under brick arch

Thanks James -I will give it a try this weekend.
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Old 03-24-2009, 10:51 AM
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Join Date: Jul 2005
Location: New Jersey USA
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Default Re: Vermiculite concrete under brick arch

It dries to a cork like consistency. It will flake off at the edges, but you mostly want to keep the edges covered anyway.

In short: Vermiculite concrete has lots of compressive strength, but almost no tensile strength. It's used for swimming pools that are under tons of pressure.
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