#1  
Old 10-13-2012, 04:26 PM
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Default what grade of vermiculite

What is the grade of vermiculite that is best for insulating around/above the dome
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  #2  
Old 10-31-2012, 05:34 PM
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Location: Mesa, AZ
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Default Re: what grade of vermiculite

Coarse to medium. You're trying to create air space within the material to trap the heat, so powdery stuff isn't preferred.
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Old 10-31-2012, 06:41 PM
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Default Re: what grade of vermiculite

Quote:
Originally Posted by azatty View Post
Coarse to medium. You're trying to create air space within the material to trap the heat, so powdery stuff isn't preferred.
Yes that's true, you don't want powdery, but the fine vermiculite makes a more workable mix although it takes more water. I doubt whether ther is any measurable difference between fine med or coarse in the final product, after all a bucket of small marbles weighs the same as a bucket of large marbles. The spaces maybe bigger but the volume of the spaces is the same. Try 50% perlite 50% vermiculite it makes a good workable mix with minimal cement needed to hold it together

Last edited by david s; 01-05-2013 at 07:49 PM. Reason: Typo
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Old 10-31-2012, 07:41 PM
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Default Re: what grade of vermiculite

I figured you are using it for enclosure filling. But if you're doing an igloo, I'd go with david's suggestion.
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Old 10-31-2012, 07:47 PM
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Default Re: what grade of vermiculite

Quote:
Originally Posted by azatty View Post
I figured you are using it for enclosure filling. But if you're doing an igloo, I'd go with david's suggestion.
Yeah,sorry, I was assuming you we're doing an igloo. If doing an enclosure go with azatty's advice. Probably less compaction with the coarse stuff.
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Old 11-24-2012, 11:53 AM
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Location: New Zealand
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Default Re: what grade of vermiculite

I am also search for the grade required for making an insulated hearth, but I can only seem to get my hands on Perlite ore down in New Zealnd.
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