On 06 Jan 2019, trader_4 wrote in
alt.home.repair:

I would suspect that the issue isn't that it's fiberglass
insulation, but that it looks like construction debris.

Seems to me you can look at half the trash in my can and consider it to
be "construction debris". In this case there was only about a quarter
of a barrel of the stuff, so I hope that wasn't the reason they didn't
take it. Especially since I plan to replace some more of the insulation
over the next few weeks and throw away the old.

I did stuff it into a bag, so they will probably won't give it another
thought. I hate to play games like that, and it's a waste of a plastic
bag.