Cellulose vs Fiberglass Blow-In — A Utah Retrofit Perspective
Density, convection, and installation realities—not brand loyalty—for vented attic floors.
Both materials work when installed to coverage and density targets. Cellulose often wins on installed density in irregular bays; fiberglass can make sense when moisture conditions or assembly details favor it. We pick for the house, not the truck.
Ignore contractor folklore; look at installed depth, evenness around eaves, and whether someone actually walked the attic instead of hosing from the hatch.