Washington State Department of Health Asbestos in Vermiculite Insulation

Asbestos in vermiculite insulation has become a recent national concern to a variety of federal agencies and to many citizens throughout the country. Vermiculite ore containing asbestos from the W.R. Grace and Company mine in Libby, Montana, was processed, then marketed as olite Attic Insulation from 1963 to 1984. Reportedly, this insulation was used in millions of homes and businesses nationwide, and in more than 50,000 homes here in Washington State.

Vermiculite insulation has a layered structure and glittery, granular appearance. The granules are small about the size of a pencil eraser, and may have a silvery, gold, translucent or brownish cast. After years in the attic, however, the granules may darken to black or gray. Other insulation materials like fiberglass are pink, yellow, or white and have a texture like cotton candy. Cellulose and rock wool both appear gray in color. Cellulose has the texture of finely shredded newspaper, and rock wool of dense wool. Washington State Department of Health shares the concerns of federal agencies and citizens regarding potential exposure to insulation containing asbestos by workers and residents. Asbestos has long been recognized as a human health hazard, and inhalation of the asbestos fibers should be avoided. If you suspect that your attic is insulated with vermiculite, the following resources will help you find answers to your questions regarding asbestos in vermiculite insulation.