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ShannonCorum 02-26-2013 05:33 AM

Vermiculite or Perlite
I'm sure this has already been answered somewhere, but I can't find it so I thought I'd just ask.

I have a choice of medium grade vermiculite or coarse grade perlite at my local Home Depot. Which would be better?

I plan on using it to insulate under my over floor and also to insulate over the dome (both as a mix with concrete and loose over the dome).



david s 02-26-2013 10:12 AM

Re: Vermiculite or Perlite
Perlite on its own is a better insulator, but once mixed with cement there is little difference. I dislike the the fine dust that perlite contains. It is an irritant if you inhale it (wear a mask) never have a problem with vermiculite re this. I can't explain why but if you are mixing with cement a 50/50 mix of perlite and vermiculite makes up a much more workable mix than either of the two alone, particularly if you are making a lean brew.

ShannonCorum 02-26-2013 10:15 AM

Re: Vermiculite or Perlite
Thanks. The Perlite is about $4 less per bag than the Vermiculite for the same size (2cu ft). Didn't know if the coarse texture perlite was better than the medium of the vermiculte, or vice versa. I don't think Home Depot carries it in store for very long each year so I want to go ahead and grab it while I can.


david s 02-26-2013 10:46 AM

Re: Vermiculite or Perlite
You may be able to get it cheaper in larger bags (4 cu ft) from nurseries or hydroponics suppliers.

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