Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Components (hierarchy name)
4. components (objects parts)
5. [components by specific context]
6. architectural elements
7. [structural elements and components for structural elements]
8. structural element components
9. [balloon and platform frame components]

Anotations

Scope note:

Pieces of timber inserted in a roof, floor, or wooden partition to support a header, which in turn supports the ends of the joists, rafters, or studs. Also, small horizontal beams, as in a floor, into which the ends of one or more joists are framed.