And if it's that old, be careful with the black dust. You very well might have vermiculite insulation. there was a manufacturer in the early 1900's that got their vermiculite from ( I think ) it was tennessee, and it had a bunch of asbestos in it.
The stuff tends to crumble and fall apart over time. It looks like small brown globs in the joists, or even like brown packing peanuts. The tainted vermiculite only came from a very few sources though.
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