Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by function]
6. building materials

Anotations

Scope note:

Highly reflective building materials with nonradiating properties, usually aluminum-foil-faced kraft paper or plastic film, placed in an airspace to block only radiant transfer from a heat-radiating surface, such as a hot roof, to a heat-absorbing surface, such as conventional attic insulation.