I own a 1900 Victorian farmhouse located in Maine on the central coast. I have just put on a new roof and now want to improve the insulation. The existing insulation under the attic floorboards is a loose gray colored wooly material. It comes up to about 1/2 the floor joist level. Can I add additional loose fill insulation on top of it and then replace the floor boards? Or would I be better off removing the old loose fill and replacing it with roll out insulation?
The attic runs the full length of the house and includes single double hung windows on the gable ends and 2 pairs of double hung windows on the south/west side. It is about 12 feet high at the ridge.