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. roofs
12. [roofs by construction]

Narrower term/s

• couple roofs
• hammer-beam roofs
• king-post roofs
• queen-post roofs
• trussed rafter roofs

Anotations

Scope note:

Roofs having trusses rather than rafters, and beams or purlins, meaning the frame comprises a triangle-based webbing having the function to support the roof and tie the outside walls. Truss roofs may be wood or steel.