Cellulose Insulation Fights Fire
Cellulose is dense material that is relatively impervious to flames and gases . Because of this, and the fire retardance of the material, fire does not spread readily into cellulose-insulated walls or ceilings. Walls insulated with cellulose don't become draft chambers that deliver oxygen to burning framing members, and cellulose greatly restricts the amount of oxygen available to support combustion.