definition
strict definition
cellulose loose fill
Particles or loose pieces of organic plant fiber used as thermal insulation.
Cellulose loose fill is a thermal insulation material made of organic plant fiber (C₆H₁₀O₅)ₙ. It can be blown or packed into spaces in walls or roofs; the appropriate density depends on the product and application. Cellulose insulation is commonly made from recycled paper and treated for fire and pest resistance.
The material is installed as loose plant-derived fiber in wall or roof spaces. Dense packing and open loose filling are different applications of that material.
Recycled paper is a common source. Fire-retardant treatment and moisture conditions affect performance; cellulose is not inherently immune to mold or other effects of wetting.
Related definitions
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fiberglass loose fill
Glass fibers stuffed loosely into wall or roof cavities for thermal insulation. -
granulated cork
Granules of cork-oak bark used as loose thermal insulation in wall or roof spaces. -
hemp loose fill
Loose hemp fibers packed into wall or roof cavities as thermal insulation, generally from low-psychoactivity plant varieties. -
mineral wool loose fill
Unbound mineral fibers used as loose thermal insulation, including rock wool and blast-furnace slag wool. -
perlite loose fill
Loose expanded perlite particles used as thermal insulation, made by heating naturally occurring volcanic glass. -
straw bales
Bales of straw from grasses such as wheat or rice used as thermal insulation within a building assembly. -
vermiculite loose fill
Loose expanded particles of vermiculite mineral used as thermal insulation in building spaces.