Old 11-03-2010, 04:28 PM
Join Date: Jul 2010
Location: Jacksonville,Fl
Posts: 167
Default Baking vermiculite

My vermiculite is about a year old, stored under a wet tree, and feels "wet" to the touch. I am also curing my oven by firing for a week straight, if it goes out at night, start again in the morning, but for a week.

So, I also have big flat pans, so I am drying my vermiculite on pans in the oven, then after cooling, pouring in between my insulation and my walls, especially the tight part of the sides. I am noticing that the vermiculite seems to be popping like popcorn, just not jumping. I am thinking that the expanded state has more R value, and obviously after baking for maybe 1/2 hour should be totally dry and therefore safe to use .
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Old 11-03-2010, 07:39 PM
dmun's Avatar
Join Date: Jul 2005
Location: New Jersey USA
Posts: 4,216
Default Re: Baking vermiculite

Mineral vermiculite is popped like popcorn to expand it. I wasn't aware that it happened again if you heated it wet. Very interesting.
My geodesic oven project:
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