My home insulation looks like vermiculite. How do I know whether its Zonolite from Libby?
It’s impossible to tell just by looking at it. Often, empty Zonolite kraft paper bags were left in the attic. If the bags show that ore was processed by W.R. Grace Canada, Grant Industries or F. Hyde and Co., the product is probably from Libby. If you know you have vermiculite insulation in your attic or walls and you’re concerned about it, it probably makes sense to test the material to see whether it contains asbestos.
