R-Value When It Counts

Some insulation materials perform better in moderately cold climates, and tests have proven that cellulose performs consistently, retaining its R-value even under the coldest sub-zero conditions. As temperatures drop below freezing, the R-value of cellulose may actually increase, whereas the R-value of fiberglass begins to decrease substantially.

The Density Factor

Cellulose has earned a Class A flame-spread rating and actually reduces fire spread rate because of its density which minimizes oxygen consumption. The dense structure of cellulose and its fire retardant qualities inhibit fire from spreading through a building by blocking flames and hot gases from passing through insulated walls and ceilings. Cellulose density is also responsible for preventing convection heat loss. As heat rises it is replaced with cold air (convection). With the density of cellulose there is no room for heat to rise, thus eliminating convection heat loss.

FACT: Cellulose fiber insulation increases fire resistance performance by 22% to 55%.

Settling

All loose-fill insulation settles after installation. Cellulose insulation should be specified and sold at settled density, so compensation for settling is built into the bag count and material weight columns of cellulose coverage charts.

There are no industry or government standards that address settlement of fiberglass insulation, in spite of the fact that several studies indicate blown fiberglass insulation settles. The Federal Trade Commission R-value Rule acknowledges that fiberglass settles, but contains no provisions requiring manufacturers to account for loss of thickness after installation.