You could also lightly spray for insects over fiberglass if needed.
Attic walkway above insulation.
However if you need to make it narrower i would recommend standing some unfaced blanket insulation on end along the edges of the walkway to hold the loose.
Build an attic walkway above the insulation attics are often left bare with exposed wood framing elements and insulation creating a somewhat hostile environment.
The floor must extend beyond the insulation so that the insulation is properly covered.
I would recommend fiberglass blown in insulation rather than cellulose because it is not conducive to insects.
Cut either 2 by 4 inch or 2 by 6 inch lumber into lengths that match the width of the plywood.
The lumber should be wide enough to extend above the level of the fiberglass insulation when.
The attic walkway is constructed so that sits above the horizontal chords of your attic.
They were willing to drop a line in the wall from above but only if they had attic access with a sturdy attic walkway.
An attic walkway never trumps the safety and structural integrity of the house.
Because of this the space is able to supporting heavy loads.
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The blown in insulation can be blown right over the ductwork.
An attic catwalk gives you a margin of safety when you are in the attic.
Standard joist spacing for the installation of attic flooring materials is 16 inches on center oc meaning the distance from the center of one joist to the center of the next joist is 16 inches.
Our cable and internet company agreed.