My 17 year old house has blown fiberglass insulation. I would like to create walkways in the attic by nailing plywood to the tops of the joists, which would obviously cover the insulation. Before doing so I would like to make sure the insulation under the plywood is the best it can possibly be. I could either add more loose fill insulation by hand, or replace all the loose fill under the new plywood with batts. I intend to add cross-members between the joists such that the area under each piece of plywood is sealed.
So my question is- what would be better for such a scenario- 17 year old blown insulation with some loose-fill added by hand (I don't have a blower or aerator), or custom fitted batts?
Thanks in advance.