If conditioned air is seeping into the attic in winter it can condense it s moisture out in the cooler layers of the insulation sometimes to the point of dripping through onto the ceiling but it also increases the moisture content of the wood in the attic.
Insulated attic walkway.
If you need a second layer of batting insulation lay it perpendicular to the first layer.
If you can insulate below the floors use rock wool or fiberglass batting to the depth of the floor joists.
The blown in insulation can be blown right over the ductwork.
There is no walkway or landing in the attic.
Add weatherstripping around the perimeter and a sweep to the door of a walk up attic.
Do you just wade through the insulation on your inspection.
Use a zippered insulated tent to keep the enclosure draft free attic tent at 7 attic cover insulator 120.
Because of this the space is able to supporting heavy loads.
The insulation is 12 15 deep.
This is because the horizontal chords are the strongest part of the attic.
Affix rigid foam insulation to the attic side of the hatch or door.
I would recommend fiberglass blown in insulation rather than cellulose because it is not conducive to insects.
You could also lightly spray for insects over fiberglass if needed.
The floor must extend beyond the insulation so that the insulation is properly covered.
The only means of traversing the attic is by walking the joists.
The attic walkway is constructed so that sits above the horizontal chords of your attic.
Attic hatch or door.
With any attic insulation project an all important first step is to air seal the ceiling plane below at every electrical plumbing flue and duct penetration.
If you find leaks seal with an appropriate foam.
Pull down stair or ladder.
Insure there are no air leaks around plumbing vents electrical wiring or in corners.