Question by : What kind of insulation is this?
In my attic, I have found two types of blown in and/or loose fill shredded insulation, in two layers, totaling 6 inches of depth. The bottom layer is a very dark gray "wool," where the top layer is a yellow shredded material that I think is fiberglass. The house was built around 1950. I have been laying blankets of fiberglass insulation to increase the R-value, but I was concerned there might be asbestos. What are the two layers, especially
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