I recently had our Zonolite vermiculite asbestos professionally removed. The company used a large vacuum truck to remove it. They also ripped out the 6mm plastic vapour barrier in the attic. They explained that it was necessary to do so to remove the settled asbestos dust.
Currently, I have no insulation in my attic. I was going to go and put either fibreglass batts or blow in fibreglass insulation. However, I am concerned about not having a vapour barrier. The abatement company tells me that I don't need a vapour barrier in the ceiling/attic as the attic is well vented and as long as I install the insulation to at least R-40.
If we had to replace the vapour barrier, I am not even sure how I would do that. The trusses are 2x4 trusses, 24" apart. It seems that it would be a lot of work trying to re-install a vapour barrier underneath the trusses but above the drywall.