Old 12-14-2006, 08:34 PM
Join Date: Dec 2006
Location: Mill Valley, Ca 94941
Posts: 8
Default vermiculite vs. perlite

What is a better insulator, vermiculite or perlite? what is easier to work with? thanks for any suggestions.
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Old 12-15-2006, 08:37 AM
maver's Avatar
Master Builder
Join Date: Aug 2006
Location: Puyallup, WA
Posts: 571
Default k values

I looked this up several months ago, the source I found indicated perlite is marginally better as an insulator. I don't think the difference is significant and probably varies with the prep (size of particles and how well "puffed" the perlite/vermiculite is). I think they are similar to handle as well. I'd choose just based on cost and ease of acquisition in your area.
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Old 12-15-2006, 09:06 AM
james's Avatar
Brick Oven Merchant
Join Date: Mar 2005
Location: Pebble Beach, CA
Posts: 4,648

I'm with Maver. Everything I have read shows very similar thermal characteristics. My local Home Depot carries both, and the cost is also similar. I have always worked with vermiculite, so I cannot comment on which is easier, though I know of many builders who have used Perlite.

I would base my decision on ease of acquisition as well.


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Old 12-15-2006, 10:22 AM
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Join Date: Jul 2005
Location: New Jersey USA
Posts: 4,216

Since perlite is white, it's easier to see if the dry ingredients are thoroughly mixed before you add water. Otherwise, there's no real difference.
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