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. roof frame components
13. horizontal roof frame components

Narrower term/s

• gōpānasī

Anotations

Scope note:

The horizontal timbers laid across the principal rafters and supporting the common rafters in a roof. Purlins differ from beams in roof construction in that purlins usually do not support any other members, instead supporting loads from the roof deck.