The effectiveness of thermal insulation materials mostly depends on their thermal conductivity. The low thermal conductivity is
predetermined by density, structure, moisture content and temperature of material and, considerably less, by other indices. Loosefill
cellulose insulation is allocated to the group of materials, the density of which fluctuates within large limits. This property is
related not only to application of cellulose wool in different constructions, but also to technological aspects of production and
operating characteristics. Cellulose wool of higher density is used to prevent settling of thermal insulation layer in constructions.
This study covers the investigations performed as to thermal conductivity and granulometric composition of loose-fill cellulose
insulation, as well as to assessment of impact of moisture content on this index. For description of relationship of thermal
conductivity, the regression equations were obtained. The relationship between density and load of loose-fill cellulose insulation
of different structure was evaluated. Using the scanning microscopy, the main elements of cellulose wool were established and
the mechanism of impact of structure on thermal conductivity and density of material was explained.