My access to 1/2 of my attic is thru a 1' by 2' hatch in a second story closet. The blown fiberglass is full of mice holes and acorns and is thin(2-4"). The freeloaders have been evicted. The area is open with no walk or crawling boards and the ceilings below are textured. I would like to blow in cellulose over the fiberglass. Any problems with this idea?