Batted fiberglass insulation gets dirty because of two reasons: the areas it is insulating is not properly sealed and the batting itself lets air pass through. Air passes through batted fiberglass so easily that dirt gets trapped in the fibers. This means the dirt that isn't trapped by the batting is getting into your living space. Dr. Energy Saver offers a variety of insulation and air sealing packages. Contact us today to schedule your free insulation checkup with one of our certified inspectors!