I have a lot of fiberglass insulation in my attice that is grey to dark gray/black in spots on the exposed top and the edges. I was told today by the local code enforcement he didn't beleive it was mold, but was dirt/dust. It can be seen here:
My cold air return for my furnace also looks like this on one end of the house:
This section is above an unheated 2 car garage.
And this all over one whole section of the attic roof:
There are some other boards with a greenish-white-blackish mold in the attic.
Any opinions?