Chris writes from State College, Pennsylvania: "Have about 6 inches of loose cellulose insulation in attic of 1967 build split level with electric "ceiling heat". Calculator says R-30 (no paper face) fiberglass addition to reach R-49. Is it safe with 'electric ceiling heat'?"

Answer: Yes, using unfaced Fiberglas™ insulation should be fine. The maximum operating temperature of our fiberglass insulation is 250 degrees Fahrenheit.