Vermiculite Insulation Overview 
Concerns about Asbestos-Contaminated Vermiculite Insulation 
For Electric & Natural Gas Customers

According to the U.S. Environmental Protection Agency (EPA), mines in Montana were the source of more than 70 percent of all vermiculite sold in the United States from 1919 to 1990. A mine in Libby, MT also contained deposits of asbestos. As the vermiculite was mined, it was contaminated with asbestos. Vermiculite from this mine was used in the majority of vermiculite insulation in the United States and was often sold under the brand name Zonolite.

Vermiculite insulation is a pebble-like, pour-in product and is usually gray-brown or silver-gold in color. A link to the EPA website can help you identify potentially contaminated vermiculite. The EPA suggests that after viewing the pictures, look at your insulation without disturbing it. If you have vermiculite insulation in your home, you should assume this material may be contaminated with asbestos and be aware of steps you can take to protect yourself and your family from exposure to asbestos.

If your attic contains vermiculite insullation, contact a trained professional for assistance. Testing for asbestos can be done by a trained professional. However, this may be expensive and, depending on the methods used, might give you misleading results. The EPA does not recommend that you open your walls to check for vermiculite. For more information about removal of contaminated vermiculite, go to the EPA website and talk with your local insulating contractor. Mention your concerns about asbestos and they can direct you to properly trained asbestos removal professionals to assist with your needs.

Related Topics
  • Attic Insulation
  • Basement Insulation
  • Bug Retardant Insulation
  • Foam Insulation
  • Light Switch and Wall Outlet Insulation
  • Wall Insulation


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