Andy writes from Grand Rapids, Michigan: “Is adding Owens Corning fiberglass insulation over cellulose a good idea, or should I remove the cellulose first?
It is OK to place fiberglass insulation over cellulose. If you do add insulation, make sure it is unfaced (no paper). However, I recommend removing the cellulose, installing faced insulation paper-side down and then adding more unfaced insulation. For maximum energy efficiency, we recommend an insulation value of R-60 for attic floors – which is about 18 inches of insulation.
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