#21  
Old 08-14-2013, 08:52 PM
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Default Re: Is the home depot vermiculite good?

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Originally Posted by martin_80x View Post
I will do that then, but what confused me was the getting started thread, which says concrete mix in the drawing.
http://www.fornobravo.com/forum/f6/h...sophy-693.html (Hearth Design Philosophy)
Because it has the components of concrete - Portland cement, aggregate and water.
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  #22  
Old 08-14-2013, 09:09 PM
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Default Re: Is the home depot vermiculite good?

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Originally Posted by Tscarborough View Post
The difference is not small, David, it is almost double for open VS closed cell foams.
That may be true for open vs closed foam cells which have different surface properties. But small vs large grains of vermiculite have similar surfaces.
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  #23  
Old 08-15-2013, 02:22 PM
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Default Re: Is the home depot vermiculite good?

I've not seen any published data on the relative insulating values of fine vs coarse vermiculite so it may be up to us to conduct some tests. I don't have any of the fine stuff on hand, but may try to get a bag next time I need more. Then make up some samples and test them. I'd also be quite interested to see the difference between the insulating values of 5:1 vermicrete and 10:1, so could also include samples of eac of these in the test.
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