Also called blown-in fiberglass, a qualified insulation contractor can use net-in blow to provide a tight, well-insulated compartment. It is excellent for attic insulation, cathedral ceilings, floors and other closed cavities and irregular spaces. A proper install will prevent settling and maintain your R-value, which is limited by the size of the wall studs. Since it is blown in, it does not leave any gaps to allow heat loss or air infiltration, often making it a better choice than fiberglass batts. Proper installation requires a professional team. M&M Insulation are your Minnesota experts at blown attic insulation.