It is often made of fiberglass but is also available as mineral wool ... and foam board insulation, however, loose-fill is ...
Insulating a roof, not to be confused with insulating an attic, is another way to ... suggests a minimum of 11 inches of rock wool or fiberglass insulation or eight inches of cellulose.
Call In a Pro for a Structural Analysis Your attic floor may be strong enough ... out the newer high-density fiberglass ...