Which of the following materials is NOT typically used for loose fill insulation?

Loose fill insulation consists of materials that can be blown or poured into spaces, typically in attics or wall cavities, to minimize heat loss and improve energy efficiency. The materials commonly used for loose fill insulation, such as cellulose, cellulose fiber, vermiculite, and pine fibers, possess specific characteristics that make them suitable. They are lightweight, can conform to irregular shapes, and have good thermal properties.

Plywood, however, does not share these characteristics. It is a solid building material made from layers of wood veneer, glued together. Plywood is not used as insulation because it does not provide the necessary thermal resistance, is significantly heavier than loose fill options, and cannot be blown or poured into cavities. Instead, plywood serves structural and sheathing purposes in construction, not thermal insulation. Thus, it is indeed not a typical material for loose fill insulation.