#1  
Old 07-03-2009, 11:50 AM
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Location: Austin, Texas
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Default Vermiculite or Perlite, what's the difference?

I placed my order for the supplies to start my project and the masonry supplier only carries Perlite. Is that the same as vermiculite? I asked if it was silicone coated and he said no, but I am not sure if the guy would have known in the first place.
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Old 07-05-2009, 03:36 PM
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Default Re: Vermiculite or Perlite, what's the difference?

Perlite will do the same job as vermiculite. Perlite is a "blown" rock.

Make sure it is the coarse grained perlite. Particles should be in the order of 1/8 to 1/4 inch or so.

I used half vermiculite / half perlite in my insulating layer.
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Old 07-05-2009, 06:59 PM
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Default Re: Vermiculite or Perlite, what's the difference?

Perlite works fine. It's what I used, and I didn't have any grains as big as quarter inch. It has the advantage, being white, of having a visual indication of when it's fully mixed with the portland.
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Old 07-06-2009, 06:45 PM
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Default Re: Vermiculite or Perlite, what's the difference?

I just finished working with perlite and can report that it's easy to work with and mixed well with the portland. I dry mixed the portland and perlite then added water and it mixed well. With a 5:1 perlite to portland ratio I used 8 cubic feet of perlite to about a bag of portland. Hope this helps
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Old 07-07-2009, 08:17 AM
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Default Re: Vermiculite or Perlite, what's the difference?

Thanks for the information

David
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