Definition from IAI: This enumeration defines the basic configuration of the roof in terms of the different roof shapes.
Roofs which are subdivided into more than these basic shapes have to be defined by the geometry only. Also roofs with non-regular shapes ( free form roof ) have to be defined by the geometry only. The type of such roofs is OTHEROPERATION.
HISTORY New Enumeration in IFC Release 2.0, Documentation and enumerators improved in IFC Release 2x
ISSUE See issue and change log for changes made in IFC Release 2x.
Illustration
| Enumerator | Description | Figure |
| FLAT_ROOF | A roof having no slope, or one with only a slight pitch so as to drain rainwater. |  |
| SHED_ROOF | A roof having a single slope. |  |
| GABLE_ROOF | A roof sloping downward in two parts from a central ridge, so as to form a gable at each end. |  |
| HIP_ROOF | A roof having sloping ends and sides meeting at an inclined projecting angle. |  |
| HIPPED_GABLE_ROOF | A roof having a hipped end truncating a gable. |  |
| GAMBREL_ROOF | A ridged roof divided on each side into a shallower slope above a steeper one. |  |
| MANSARD_ROOF | A roof having on each side a steeper lower part and a shallower upper part. |  |
| BARREL_ROOF | A roof or ceiling having a semicylindrical form. |  |
| RAINBOW_ROOF | A gable roof in the form of a broad Gothic arch, with gently sloping convex surfaces. |  |
| BUTTERFLY_ROOF | A roof having two slopes, each descending inward from the eaves. |  |
| PAVILION_ROOF | A pyramidal hip roof. |  |
| DOME_ROOF | A hemispherical hip roof. |  |
| FREEFORM | Free form roof | |
| NOTDEFINED | No specification given |
NOTE
- These figures are only shown as illustrations.