vermiculite vs. perlite

[rudi kuehnhackl]

What is a better insulator, vermiculite or perlite? what is easier to work with? thanks for any suggestions.
rudi.

[maver]

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.

[james]

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.

James

[dmun]

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.