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The installation of any new insulation over top of 'bad/damaged' insulation is a bad idea. 1) you lose the R-value. 2) You won't be able to install the PROPER R-value. 3) The installation will be uneven.
Go w/your gut feeling which is to remove the old insulation. If you don't have a Pro do this, make sure you wear the proper clothing and masking to do the job safely.
My best to ya and hope this helps.
Jay J -Moderator
PS: It's hard to say if blown insulation is what you should do. Consider cost as well as longevity. If the attic gets wet, blown insulation could lose its R-value rather quickly. Just make sure you consider as much as you can before you make your decision.
PPS: God Bless America!