I have an upstairs bedroom that is adjacent to an attic area. The attic floors have fiber glass insulation with some gaps. the wall between attic and bedroom has insulation that looks thinner and brown sawdust looking filler in it. (bungalow style house built in '48)
I'm thinking that old insulation may not be efficient enough and causing drafts.
Should I remove old insulation or can I put newer fiberglass bats over existing insulation?