(24) Stairs (system Family)
A Stair element can consist of the following components: Runs, Landings, Supports (side and centre), and Railings.
To create a stair, the Stair Assembly Edit Mode is used to assemble the various components and develop customised solutions. This can be done in either a 3D view or a plan view.
The individual components of a stair are independent, yet maintain an intelligent relationship with the other components within a given stair assembly. For example, if steps are removed from a particular Run, additional steps are automatically added to another connected Run to maintain the overall stair height.
Since a stair is composed of individual components, these can also be scheduled, documented, and controlled separately, where required.
A stair in Revit is created by assembling individual components within Stair Assembly Edit Mode. The process begins by defining the stair's base and top levels, followed by the creation of one or more Runs in either a plan view or a 3D view. Landings connect the individual runs and can be generated automatically or created and adjusted manually.
Supports can be generated alongside the runs or added separately along the edges of runs and landings. Railings can be specified for automatic placement during stair creation or added afterwards.
Once the main components have been assembled, their dimensions, positions, and relationships can be adjusted to achieve the desired stair configuration. When standard Revit components are used, connected runs and landings interact parametrically, allowing changes to one component to trigger corresponding adjustments to others while maintaining the overall stair height and design intent.
The stair is completed by exiting Stair Assembly Edit Mode. Its individual components remain separately accessible for further editing, scheduling, tagging, and documentation. Custom-sketched components can also be used when greater geometric freedom is required, although these may require manual adjustment when neighbouring components are modified.
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IfcStair
Definition from ISO 6707-1:1989
Construction comprising a succession of horizontal stages (steps or landings) that make it possible to pass on foot to other levels.
Definition from buildingSMART
A vertical passageway allowing occupants to walk (step) from one floor level to another floor level at a different elevation. It may include a landing as an intermediate floor slab.
The stair is a container entity that aggregates all components of the stair, it represents. The aggregation is handled via the IfcRelAggregates relationship, relating an IfcStair with the related flights (IfcStairFlight) and landings (IfcSlab with type 'Landing').
Property Set Use Definition
The property sets relating to the IfcStair are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcStair are part of this IFC release Pset_StairCommon, common property set for all stair occurrences.
Geometry Use Definitions
The geometric representation of IfcStair is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Independent geometric representations should only be used when the IfcStair is not defined as an aggregate. If defined as an aggregate, the geometric representation is the sum of the representation of the components within the aggregate.
Local placement
The local placement for IfcStair is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations.
- The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the same IfcSpatialStructureElement that is used in the ContainedInStructure inverse attribute or to a referenced spatial structure element at a higher level.
- If the relative placement is not used, the absolute placement is defined within the world coordinate system.
If the LocalPlacement is given for the IfcStair, then all components, which are aggregated to the stair should use this placement as their relative placement.
Geometric Representation
If the IfcStair has components (referenced by SELFIfcObject.IsDecomposedBy) then no independent geometric representation shall defined for the IfcStair. The IfcStair is then geometrically represented by the geometric representation of its components. The components are accessed via SELFIfcObject.IsDecomposedBy[1].RelatedObjects.
If the IfcStair has no components defined (empty set of SELFIfcObject.IsDecomposedBy) then the IfcStair may be represented by an IfcShapeRepresentation with the RepresentationType = 'Brep'.
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Revit Families: Walls (system Family)
Revit Families: Curtain Walls (system Family)
Revit Families: Floors (system Family)
Revit Families: Railings (system Family)
Revit Families: Doors (loadable Family)
Revit Families: Windows (loadable Family)
Revit Families: Curtain Wall Panels (loadable Family)
Revit Families: Furniture (loadable Family)
Revit Families: Detail Components (loadable Family)