good choice for finished basementsn-Types of Loose-Fill Insulation
The most common types of materials used for loose-fill insulation include cellulose, fiberglass, and mineral (rock or slag) wool. All of these materials are produced using recycled waste materials. Cellulose is primarily made from recycled newsprint. Most fiberglass contains 20%–30% recycled glass. Mineral wool is usually produced from 75% post-industrial recycled content.
Some less common types of loose-fill insulation include polystyrene beads and vermiculite and perlite.
Source: EERE, U.S. Department of Energy