The fiberglass insulation reached 120 degrees Fahrenheit under the heat lamp at the Delaware Capital Region Bridal Show. The heat lamp represents the sun beating down on your roof in the summer and the temperature reflected is what happens in your attic with traditional fiberglass insulation. All that heat is pushing down on your home in the summer. Prevent it with a radiant barrier or Dr. Energy Saver's patented SilverGlo® foam insulation.