Vermiculite In Attic Years Used

It has vermiculite insulation in the attic.

Vermiculite in attic years used.

Sizes of vermiculite products range from very fine particles to large coarse pieces nearly an inch long. For years zonolite was used in the insulation of homes throughout the united states. The mine was closed in 1990. When the vermiculite was extracted some tremolite came in with the mix.

If your home was built before 1990 you might have vermiculite insulation in your walls or attic. As well as being rich in vermiculite this mine had the misfortune of having a deposit of tremolite a type of asbestos. Grace owner of the montana mine that produced zonolite came to a different conclusion. Concerns about asbestos contaminated vermiculite insulation.

About 20 years ago i had additional insulation blown in to the attic that covered the vermiculite. Vermiculite insulation and asbestos vermiculite. I installed sofett covers and did electrical rewiring over the 30 to 40 years i have lived here. We have lived in this house for 40 years.

The majority of the vermiculite used worldwide was from a mine in libby montana owned and operated since 1963 by w r. Some vermiculite produced at libby mine in montana from the 1920s until 1990 sold primarily under the brand name zonolite has been found to contain asbestos. The expanded vermiculite is a light weight fire resistant and odorless material and has been used in numerous products including insulation for attics and walls. I occasionally worked in the vermiculite.

Came from a mine in libby montana sold under the name zonolite. Vermiculite is a mineral used in a number of consumer products including home insulation.