So what you might want to do is sort of map out an area in the center of the attic where you have your storage and then the rest of the area you could put more insulation.
Reasons to put plywood in attic.
If your attic joists won t bear the weight necessary to finish out a living space but the engineer cleared them to support floor decking for light storage you can install inch plywood or.
Now in your particular part of the country you re going to want a lot more insulation than that.
Maneuvering heavy 4 x 8 sheets of plywood or osb oriented strand board up to an unfinished attic is sometimes like trying to fit a square peg into a round hole.
The decision regarding the thickness of plywood to use for the subfloor in the attic has a lot to do with how you intend to use the attic and it also depends on the spacing of the ceiling joists.
Because the simplest and cheapest way to insulate an attic is to add material to the floor.
Carry a piece of plywood to one of the far corners of the attic and lay it on top of the installed boards.
So you can put 8 inches of insulation down then put the plywood over that.
Stop using your attic for storage.
But if the floor is covered in plywood you can t stuff enough insulation beneath it to do the job sufficiently not even in warm climates.