Cellulose vs. Fiberglass

The following is a summary of an extensive Natural Resources Defense Council (NRDC) report. The NRDC is a non-profit environmental membership organization with over 300,000 members and contributors nationwide:

The NRDC has concluded the following:

  • Cellulose insulation manufactured from recycled paper is the least polluting and most energy efficient insulation.


  • Cellulose has the highest post-consumer recycled content. The fiberglass industry averages 35% recycled glass, while the cellulose industry averages a minimum of 75% recycled content.


  • It takes more than 10 times as much energy to produce fiberglass insulation as cellulose insulation.


  • Due to air circulation and natural convection, the R-value of blown-in fiberglass insulation decreases by as much as 50% as the temperature drops from 45 degrees F to 18 degrees F.


  • Cellulose has better resistance to air flow and prevents the upward movement of air caused by temperature differences (the R-value of cellulose actually improves during cold weather).


  • Substantial and well-documented public health threats are associated with fiberglass.


  • No adverse health effects from cellulose insulation have been identified.


Cellulose is non-toxic. Biologically, cellulose is innocuous.
~ Dr. Arthur Furst, Toxicologist


Why Cellulose?
  • Cellulose that has been properly installed in your walls will not settle.


  • Cellulose is non-corrosive to steel, copper and aluminum.


  • Cellulose will not lose it's energy saving abilities over time.


  • Cellulose will not rot, decay or mildew, and it does not support fungus or mold growth.


Will My Choice of Insulation Really Effect My Monthly Heating & Cooling Bills?