What you want to do is fill the space between the framing members.
R19 or r30 in attic.
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Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces.
Drill holes in the sheathing and blow insulation into the empty wall.
Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation.
Don t stuff r 30 into a space that just fits r 19 5 1 2 because you will lose efficiently if you do.
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If you use the attic for living space you should insulate the ceiling of the attic if not then do the ceiling of the house itself.
I believe crushing the insulation together decreases it r value.
So if r 19 is designed for 3 1 2 and r 30 is designed for 5 1 2 and you still need an inch or so for ventilation of the plywood you need to have at least 10 rafters.