As the firewall test results demonstrate, the dense structure of Nu-Wool Premium Cellulose Insulation and its fire retardants slow the spread of fire through a building by blocking flames and hot gases and restricting the availability of oxygen in insulated walls and ceilings. Scientists at the National Research Council Canada report that "cellulose in the wall cavity provided an increase in the fire resistance performance of 22% to 55%.1" The NRCC study showed that "the fire resistance of an assembly with glass fiber insulation was slightly lower than that of a non-insulated assembly."
|Furnace temperatures in excess of 1800 degrees||Maximum average temperature of unexposed surface: 138 degrees|
|Exposed surface after removal from furnace||End of hose stream test – unexposed surface still intact|
Fire Retardant Permanency
Fire Retardants used in Nu-Wool Premium Cellulose Insulation do not lose their effectiveness over time. Tests by scientists and technicians at Oak Ridge National Laboratory, Tennessee Technological University, Allied Signal corp., US Borax Corp., Underwriters Laboratories, and United States Testing Company, found no sign of "disappearing fire retardants."
1 NRC-CNRC Report A-4057.2, Results of Fire Resistance Tests on Small-Scale, Insulated and Non-Insulated, Gypsum Board Protected Wall Assemblies, July 1994.