What type of soil is best for use below grade?
Using the soil at the site would be ideal, and most any type can work, but it should be relatively free of organic material and large rocks; it is best to avoid heavy clay soil. Q: “Vermiculite” as a viable product for insulation of your green home. Vermiculite or “Asbestos” as it is better known, is a well documented product for its cause of lung cancer and silicosis-like effect on tissues. I would hope that you would mention these particular warnings to anyone that might use the “Vermiculite” idea from your page. A: Thank you for alerting me to this potential problem with vermiculite, which I was not aware of. In doing some on-line research into the question, I have discovered that pure vermiculite does not contain asbestos, but that there was a period of time when asbestos contaminated vermiculite mined in Libby, Montana did contain some asbestos. This contaminated vermiculite found its way into some residential insulation products sold up to about 1996 in the U.S. and Canada. If di
