I have a granulated insulation under the blown in fiberglass in my attic. I brought it to my towns building dept. in 1990 when I moved in to check it. They told me it was an early form of styrofoam and not to worry. I recently heard about zonolite on the news. When I called the building dept., they had never heard of zonolite.
I am now extremely concerned, as my wife had a bout with cancer a few years ago. What can I do ?