Doing a full gut - leave attic cellulose insulation or replace?

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I'm fully gutting a single family house. I have the lathe and plaster out of the finished attic and there is a ton of cellulose insulation behind the walls. Should I leave it in place or dispose of it and replace it? The house has a lot of mold so I am a little worried about moisture in the existing insulation.

[Mike B.]

from what I've learned with other properties.. if you're already doing a gut.. just get rid of it and put in brand new.  Get a better R value perhaps. Or maybe in pulling it you find another issue you can easily fix.  I would toss it all and put in all brand new insulation.  Also a selling point down the road that "all insulation is new" in the property (you should advertise this as well)