Tammy writes from Bellevue, Michigan: "Can you blow in cellulose insulation into a 3-1/2" wall cavity that already contains 1-1/2" batt insulation that can't be removed?"

Answer: Owens Corning does not manufacture cellulose insulation. However, our blowing wool products can be used with existing insulation. For a wall cavity there may be special considerations. I recommend consulting an insulation contractor.