IFC 4.3.0.1 (IFC4X3) development

6.1.4.20 Pset_StairCommon

6.1.4.20.1 Semantic definition

Properties common to the definition of all occurrences of IfcStair.

6.1.4.20.2 Applicable entities

6.1.4.20.3 Properties

Name Property Type Data Type Description
Reference IfcPropertySingleValue IfcIdentifier

Reference ID for this specified type in this project (e.g. type 'A-1'), Also referred to as "construction type". It should be provided as an alternative to the name of the "object type", if the software does not support object types and no classification reference to a recognized classification system used.

Status IfcPropertyEnumeratedValue PEnum_ElementStatus

Status of the element, predominately used in renovation or retrofitting projects. The status can be assigned to as "New" - element designed as new addition, "Existing" - element exists and remains, "Demolish" - element existed but is to be demolished, "Temporary" - element will exists only temporary (like a temporary support structure).

NumberOfRiser IfcPropertySingleValue IfcCountMeasure

Total number of the risers included in the stair or stair flight.

NumberOfTreads IfcPropertySingleValue IfcCountMeasure

Total number of treads included in the stair or stairflight.

RiserHeight IfcPropertySingleValue IfcPositiveLengthMeasure

Vertical distance from tread to tread. The riser height is supposed to be equal for all steps of a stair or stair flight.

TreadLength IfcPropertySingleValue IfcPositiveLengthMeasure

Horizontal distance from the front of the thread to the front of the next tread. The tread length is supposed to be equal for all steps of the stair or stair flight at the walking line.

NosingLength IfcPropertySingleValue IfcLengthMeasure

Horizontal distance from the front of the tread to the riser underneath. It is the overhang of the tread.

WalkingLineOffset IfcPropertySingleValue IfcPositiveLengthMeasure

Offset of the walking line from the inner side of the flight. Note: the walking line may have a own shape representation (in case of inconsistencies, the value derived from the shape representation shall take precedence).

TreadLengthAtOffset IfcPropertySingleValue IfcPositiveLengthMeasure

Length of treads at a given offset. Walking line position is given by the 'WalkingLineOffset'. The resulting value should normally be identical with TreadLength, it may be given in addition, if the walking line offset for building code calculations is different from that used in design.

TreadLengthAtInnerSide IfcPropertySingleValue IfcPositiveLengthMeasure

Minimum length of treads at the inner side of the winder. Only relevant in case of winding flights, for straight flights it is identical with IfcStairFlight.TreadLength. It is a pre-calculated value, in case of inconsistencies, the value derived from the shape representation shall take precedence.

WaistThickness IfcPropertySingleValue IfcPositiveLengthMeasure

Minimum thickness of the stair flight, measured perpendicular to the slope of the flight to the inner corner of riser and tread. It is a pre-calculated value, in case of inconsistencies, the value derived from the shape representation shall take precedence.

RequiredHeadroom IfcPropertySingleValue IfcPositiveLengthMeasure

Required headroom clearance for the passageway according to the applicable building code or additional requirements.

HandicapAccessible IfcPropertySingleValue IfcBoolean

Indication that this object is designed to be accessible by the handicapped. Set to (TRUE) if this object is rated as handicap accessible according the local building codes, otherwise (FALSE). It is giving according to the requirements of the national building code.

HasNonSkidSurface IfcPropertySingleValue IfcBoolean

Indication whether the surface finish is designed to prevent slippery (TRUE) or not (FALSE).

IsExternal IfcPropertySingleValue IfcBoolean

Indication whether the element is designed for use in the exterior (TRUE) or not (FALSE). If (TRUE) it is an external element and faces the outside of the building.

ThermalTransmittance IfcPropertySingleValue IfcThermalTransmittanceMeasure

Thermal transmittance coefficient (U-Value) of an element, within the direction of the thermal flow (including all materials).

LoadBearing IfcPropertySingleValue IfcBoolean

Indicates whether the object is intended to carry loads (TRUE) or not (FALSE).

FireRating IfcPropertySingleValue IfcLabel

Fire rating for this object. It is given according to the national fire safety classification.

FireExit IfcPropertySingleValue IfcBoolean

Indication whether this object is designed to serve as an exit in the case of fire (TRUE) or not (FALSE).

Here it defines an exit stair in accordance to the national building code.

Table 6.1.4.20.A

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6.1.4.20.4 Changelog

  • property, LoadBearing
  • property, NosingLength
  • property, Status
  • property, ThermalTransmittance
  • property, TreadLengthAtInnerSide
  • property, TreadLengthAtOffset
  • property, WaistThickness
  • property, WalkingLineOffset