wrote in message
2) fiberglass guys claims that cellulose will rot the wiring and
plumbing if it get wet, and will degrade. It is also very dusty which
is a big concern for me. Cellulose guy says fiberglass has health
risks. I have heating duct in the attic, and I am concerned about the
fiberglass, or the cellulose dust being drawn into the duct and gets
everywhere. Fiberglass guy says because my house is relatively old
(1950ish), he wasn't sure if I have tube/wire electrical wire up there
and cellulose is not safe. The cellulose guy said I don't need to
worry about it.

If you have knob&tube wiring, you don't want to insulate the
wiring. It won't meet code.

Bob