Insulating a Floored Attic

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I have a pine board floor in my attic.  It has a walk up staircase and 2x10 joists, so it is meant to store lots of stuff.  The old insulation is minimal, probably wool, but in fair condition.  I would like to add more insulation, either batts or blown.  I'm considering removing the flooring and adding 2x4s across, but that would mean I have to do blown insulation I think.  The flooring will of course be put back after.  What do you recommend?

I prefer batts only because it would allow me to do the attic in stages without having to rent a machine several times.

Thank you,


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