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 elements
9. enclosing structural elements
10. [roofs and roof components]
11. roof components
12. exterior roof components

Narrower term/s

• two-way sheathing

Anotations

Scope note:

Thin boards, usually wooden, that span the trusses and support the rest of the roof. Typically oriented face-grain (strength axis) perpendicular to the roof framing, providing maximum stiffness and load capacity.