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                                                              Cellulose vs.Fiberglass                                                                        

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

                                                                       Why Cellulose?

  • Cellulose insulation manfactured from recycled paper is the least polluting and most energy efficient insulation among conventional insulation products. (Least polluting at the time of manufacture and during demolition and disposal as waste)
  • It takes more that 10 times as much energy to produce fiberglassinsulation 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 are associated with fiberglass.
  • No adverse health effects from cellulose insulation have been identified
  •   Cellulose can be sprayed into the voids around framing, wirinng, plumbing and ducts and it adapts to the irregular spaces and forms a seal. It is great blanket seal, even over fiderglass.
  • Stabilized Cellulose that has been properly installed in your walls and attic will not settle.
  • Stabilized Cellulose is non-corrosive to steel, copper and aluminum.
  • Stabilized Cellulose will not lose its energy-saving abilities over time.
  • Stabilized and treated Cellulose resists rodent and pest infestation.
  • Cellulose will not rot, decay or mildew, and it does not support fungus or mold Growth.

Cellulose has better fire resistance than fiberglass see video on site map. 
Cellulose retains R-Values as temp goes way up, or way down

 Home Insulation and Fires
window insulation sound insulation
Blown in Cellulose Insulation               Fiberglass Insulation      
Blown in cellulose insulation is treated for fire retardancy. If a fire occurs, the blown in cellulose insulation, combined with its fire retardants, can slow the fire from spreading and can create a "2-hour firewall". Scientists at the National Research Council of Canada report that, blown in cellulose insulation increases fire  Fiberglass insulation is inert, ages well and is extremely difficult to ignite. However, once fiberglass insulation has been ignited, it may burn fast, hot and could emit toxic gases. Also, fiberglass insulation should be kept away from, light fixtures, chimneys or exhaust flu's to reduce heat build-up and potential fire hazards.
resistance by 22%-55%. When Blown in Cellulose insulation does burn, it generally doesn't emit toxic chemicals.  

Insulation Installation
mineral wool insulation
Blown in Cellulose Insulation               Fiberglass Insulation      
When Installing cellulose insulation you will need special cellulose insulation equipment such as a cellulose insulation blower. Blown in cellulose insulation easily flows around obstructions and penetrates odd shaped cavities and it easily conforms around wires, electrical boxes and pipes.  Some fiberglass insulation facts on installation are: it has to be installed carefully, small fibers can cut your skin meaning you must wear protective equipment. Having to cut the fiberglass insulation to fit around wires, electrical boxes and pipes can be difficult and time consuming.
  

 Blown in Cellulose vs Fiberglass Insulation Air Infiltration
roof insulation board
Blown in cellulose insulation is 2-3 times denser than fiberglass insulation. Studies comparing Blown in cellulose insulation Vs fiberglass insulation show that cellulose insulation was 38% tighter and required 26% less energy. A Princeton University study shows, a group of homes with blown in cellulose insulation in the walls had an average of 24.5% reduction of air infiltration compared to fiberglass insulation, with only the walls insulated. A similar study, the Leominster MA Housing Project for the Elderly found that, a building with blown in cellulose insulation compared to a building with R-13 fiberglass batt insulation in the walls and R-38 fiberglass batt insulation in the ceiling, had 40% lower leakage.