Cellulose vs Fiberglass

Insulation Materials

Long ago there were several insulation materials available: Rockwool, Vermiculite, Fiberglass, Cellulose, Mineral-Wool, all sorts of stuff. Over the years we’ve seen many come and go; they were found to be dangerous, ineffective or impractical. Today there are basically two choices: Fiberglass and Cellulose. The confusing thing is that Fiberglass is available in two forms: rolled batting or blown, and Cellulose is only available as a blown material. It’s not that difficult to figure out which one is best.


Cellulose vs. Fiberglass



  • Lifetime guarantee
  • Non-toxic, safe
  • No itching
  • Rodent resistant
  • Insect resistant
  • Mold/mildew resistant
  • 10.4″ to attain an R38
  • Soundproofing
  • Soft material
  • Non-flammable


  • No Guarantee
  • Hazard-warning label
  • Very itchy & irritating
  • Rodents nest in it
  • No resistance to insects
  • No resistance to mold/mildew
  • Requires almost 15+″ for R38
  • Minimal soundproofing
  • Rigid glass fibers
  • Melts in a fire