5.4.3.64 IfcSpace

5.4.3.64.1 Semantic definition

A space represents an area or volume bounded actually or theoretically. Spaces are areas or volumes that provide for certain functions within a building.

A space is associated to a building storey (or in case of exterior spaces to a site). A space may span over several connected spaces. Therefore a space group provides for a collection of spaces included in a storey. A space can also be decomposed in parts, where each part defines a partial space. This is defined by the CompositionType attribute of the supertype IfcSpatialStructureElement which is interpreted as follow:

• COMPLEX = space group
• ELEMENT = space
• PARTIAL = partial space

Figure 5.4.3.64.A shows the IfcSpace as part of the spatial structure. It also serves as the spatial container for space related elements.

The following guidelines should apply for using the Name, Description, LongName and ObjectType attributes.

• Name holds the unique name (or space number) from the plan.
• Description holds any additional information field the user may have specified, there are no further recommendations.
• LongName holds the full name of the space, it is often used in addition to the Name, if a number is assigned to the room, then the descriptive name is exchanged as LongName.
• ObjectType holds the space type, i.e. usually the functional category of the space .

Figure 5.4.3.64.B describes the heights and elevations of the IfcSpace.

• elevation of the space (top of construction slab) equals elevation of storey: provided by IfcBuildingStorey.Elevation relative to IfcBuilding.ElevationOfRefHeight
• elevation of the space flooring (top of flooring on top of slab): provided by IfcSpace.ElevationWithFlooring relative to IfcBuilding.ElevationOfRefHeight
• height of space (top of slab below to bottom of slab above): provided by BaseQuantity with Name="Height"
• floor height of space (top of slab below to top of flooring): provided by BaseQuantity with Name="FinishFloorHeight"
• net height of space (top of flooring to bottom of suspended ceiling): provided by BaseQuantity with Name="FinishCeilingHeight"

5.4.3.64.2 Entity inheritance

1. • IfcRoot
2. • IfcObjectDefinition
   • IfcPropertyDefinition
   • IfcRelationship
3. • IfcObject
   • IfcContext
   • IfcTypeObject
4. • IfcProduct
   • IfcActor
   • IfcControl
   • IfcGroup
   • IfcProcess
   • IfcResource
5. • IfcSpatialElement
   • IfcAnnotation
   • IfcElement
   • IfcLinearElement
   • IfcPort
   • IfcPositioningElement
   • IfcStructuralActivity
   • IfcStructuralItem
6. • IfcSpatialStructureElement
   • IfcExternalSpatialStructureElement
   • IfcSpatialZone
7. • IfcSpace
   • IfcBuildingStorey
   • IfcFacility
   • IfcFacilityPart
   • IfcSite

5.4.3.64.3 Attributes

5.4.3.64.4 Formal propositions

NOT(EXISTS(PredefinedType)) OR
 (PredefinedType <> IfcSpaceTypeEnum.USERDEFINED) OR
 ((PredefinedType = IfcSpaceTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType))

(SIZEOF(IsTypedBy) = 0) OR
  ('IFC4X3_DEV_c85b862.IFCSPACETYPE' IN TYPEOF(SELF\IfcObject.IsTypedBy[1].RelatingType))

5.4.3.64.5 Property sets

• Pset_AirSideSystemInformation
  • Description
  • AirSideSystemType
  • AirSideSystemDistributionType
  • TotalAirFlow
  • EnergyGainTotal
  • AirFlowSensible
  • EnergyGainSensible
  • EnergyLoss
  • InfiltrationDiversitySummer
  • InfiltrationDiversityWinter
  • ApplianceDiversity
  • HeatingTemperatureDelta
  • CoolingTemperatureDelta
  • Ventilation
  • FanPower
• Pset_BerthCommon BERTH
  • BerthApproach
  • BerthMode
  • BerthingAngle
  • BerthingVelocity
  • AbnormalBerthingFactor
• Pset_FenderDesignCriteria BERTH
  • CoefficientOfFriction
  • EnergyAbsorptionTolerance
  • MaxReactionTolerance
  • MaximumTemperatureFactor
  • MinimumTemperatureFactor
  • VelocityFactorEnergy
  • VelocityFactorReaction
  • EnergyAbsorption
  • MaxReaction
  • MinCompressedFenderHeight
  • AddedMassCoefficientMethod
• Pset_ProcessCapacity
  • ProcessItem
  • ProcessCapacity
  • ProcessPerformance
  • DownstreamConnections
  • UpstreamConnections
• Pset_PropertyAgreement
  • AgreementType
  • TrackingIdentifier
  • AgreementVersion
  • AgreementDate
  • PropertyName
  • CommencementDate
  • TerminationDate
  • Duration
  • Options
  • ConditionCommencement
  • Restrictions
  • ConditionTermination
• Pset_Risk
  • RiskName
  • RiskType
  • NatureOfRisk
  • RiskAssessmentMethodology
  • UnmitigatedRiskLikelihood
  • UnmitigatedRiskConsequence
  • UnmitigatedRiskSignificance
  • MitigationPlanned
  • MitigatedRiskLikelihood
  • MitigatedRiskConsequence
  • MitigatedRiskSignificance
  • MitigationProposed
  • AssociatedProduct
  • AssociatedActivity
  • AssociatedLocation
• Pset_SpaceAirHandlingDimensioning
  • CoolingDesignAirFlow
  • HeatingDesignAirFlow
  • SensibleHeatGain
  • TotalHeatGain
  • TotalHeatLoss
  • CoolingDryBulb
  • CoolingRelativeHumidity
  • HeatingDryBulb
  • HeatingRelativeHumidity
  • VentilationDesignAirFlow
  • DesignAirFlow
  • CeilingRAPlenum
  • BoundaryAreaHeatLoss
• Pset_SpaceCommon
  • Reference
  • IsExternal
  • GrossPlannedArea
  • NetPlannedArea
  • PubliclyAccessible
  • HandicapAccessible
• Pset_SpaceCoveringRequirements
  • FloorCovering
  • FloorCoveringThickness
  • WallCovering
  • WallCoveringThickness
  • CeilingCovering
  • CeilingCoveringThickness
  • SkirtingBoard
  • SkirtingBoardHeight
  • Molding
  • MoldingHeight
  • ConcealedFlooring
  • ConcealedFlooringOffset
  • ConcealedCeiling
  • ConcealedCeilingOffset
• Pset_SpaceFireSafetyRequirements
  • FireRiskFactor
  • FlammableStorage
  • FireExit
  • SprinklerProtection
  • SprinklerProtectionAutomatic
  • AirPressurization
• Pset_SpaceHVACDesign
  • TemperatureSetPoint
  • TemperatureMax
  • TemperatureMin
  • TemperatureSummerMax
  • TemperatureSummerMin
  • TemperatureWinterMax
  • TemperatureWinterMin
  • HumiditySetPoint
  • HumidityMax
  • HumidityMin
  • HumiditySummer
  • HumidityWinter
  • DiscontinuedHeating
  • NaturalVentilation
  • NaturalVentilationRate
  • MechanicalVentilation
  • MechanicalVentilationRate
  • AirConditioning
  • AirConditioningCentral
  • AirHandlingName
• Pset_SpaceLightingDesign
  • ArtificialLighting
  • Illuminance
• Pset_SpaceOccupancyRequirements
  • OccupancyType
  • OccupancyNumber
  • OccupancyNumberPeak
  • OccupancyTimePerDay
  • AreaPerOccupant
  • MinimumHeadroom
  • IsOutlookDesirable
• Pset_SpaceParking PARKING
  • ParkingUse
  • ParkingUnits
  • IsAisle
  • IsOneWay
• Pset_SpaceThermalLoad
  • People
  • Lighting
  • EquipmentSensible
  • VentilationIndoorAir
  • VentilationOutdoorAir
  • RecirculatedAir
  • ExhaustAir
  • AirExchangeRate
  • DryBulbTemperature
  • RelativeHumidity
  • InfiltrationSensible
  • TotalSensibleLoad
  • TotalLatentLoad
  • TotalRadiantLoad
• Pset_SpaceThermalLoadPHistory
  • PeopleHistory
  • LightingHistory
  • EquipmentSensibleHistory
  • VentilationIndoorAirHistory
  • VentilationOutdoorAirHistory
  • RecirculatedAirHistory
  • ExhaustAirHistory
  • AirExchangeRateTimeHistory
  • DryBulbTemperatureHistory
  • RelativeHumidityHistory
  • InfiltrationSensibleHistory
  • TotalSensibleLoadHistory
  • TotalLatentLoadHistory
  • TotalRadiantLoadHistory
• Pset_SpaceThermalPHistory
  • CoolingAirFlowRate
  • HeatingAirFlowRate
  • VentilationAirFlowRateHistory
  • ExhaustAirFlowRate
  • SpaceTemperatureHistory
  • SpaceRelativeHumidity
• Pset_ThermalLoad
  • OccupancyDiversity
  • LightingDiversity
  • ApplianceDiversity
  • OutsideAirPerPerson
  • ReceptacleLoadIntensity
  • AppliancePercentLoadToRadiant
  • LightingLoadIntensity
  • LightingPercentLoadToReturnAir
  • TotalCoolingLoad
  • TotalHeatingLoad
  • InfiltrationDiversitySummer
  • InfiltrationDiversityWinter
  • LoadSafetyFactor
• Pset_Tolerance
  • ToleranceDescription
  • ToleranceBasis
  • OverallTolerance
  • HorizontalTolerance
  • OrthogonalTolerance
  • VerticalTolerance
  • PlanarFlatness
  • HorizontalFlatness
  • ElevationalFlatness
  • SideFlatness
  • OverallOrthogonality
  • HorizontalOrthogonality
  • OrthogonalOrthogonality
  • VerticalOrthogonality
  • OverallStraightness
  • HorizontalStraightness
  • OrthogonalStraightness
  • VerticalStraightness
• Pset_Uncertainty
  • UncertaintyBasis
  • UncertaintyDescription
  • HorizontalUncertainty
  • LinearUncertainty
  • OrthogonalUncertainty
  • VerticalUncertainty
• Qto_BodyGeometryValidation
  • GrossSurfaceArea
  • NetSurfaceArea
  • GrossVolume
  • NetVolume
  • SurfaceGenusBeforeFeatures
  • SurfaceGenusAfterFeatures
• Qto_SpaceBaseQuantities
  • Height
  • FinishCeilingHeight
  • FinishFloorHeight
  • GrossPerimeter
  • NetPerimeter
  • GrossFloorArea
  • NetFloorArea
  • GrossWallArea
  • NetWallArea
  • GrossCeilingArea
  • NetCeilingArea
  • GrossVolume
  • NetVolume

5.4.3.64.6 Concept usage

Concept	Usage	Description
IfcRoot (2)
Revision Control	General	Ownership, history, and merge state is captured using IfcOwnerHistory.
Software Identity	General	IfcRoot assigns the globally unique ID. In addition it may provide for a name and a description about the concept.
IfcObjectDefinition (9)
Classification Association	General	Any object occurrence or object type can have a reference to a specific classification reference, i.e. to a particular facet within a classification system.
Aggregation	General	No description available.
Approval Association	General	No description available.
Constraint Association	General	No description available.
Document Association	General	No description available.
Library Association	General	No description available.
Material Association	General	No description available.
Material Single	General	No description available.
Nesting	General	No description available.
IfcObject (5)
Object Predefined Type	General	No description available.
Object Typing	General	Any object occurrence can be typed by being assigned to a common object type utilizing this concept. A particular rule, restricting the applicable subtypes of IfcTypeObject that can be assigned, is introduced by overriding this concept at the level of subtypes of IfcObject. This concept can be applied to the following resources: IfcTypeObject
Object User Identity	General	An attribute Name and optionally Description can be used for all subypes of IfcObject. For those subtypes, that have an object type definition, such as IfcBeam - IfcBeamType, the common Name and optionally Description is associated with the object type.
Property Sets with Override	General	Any object occurrence can hold property sets, either directly at the object occurrence as element specific property sets, or at the object type, as type property sets. In this case, the properties that are provided to the object occurrence are the combinations of element specific and type properties. In case that the same property (within the same property set) is defined both in occurrence and type properties, the property value of the occurrence property overrides the property value of the type property.
Assignment to Group	General	No description available.
IfcProduct (18)
Body Geometry	General	The body or solid model geometric representation of an IfcProduct is typically defined using a Tessellation or Brep. Subtypes may provide recommendations on other representation types that may be used. The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: IfcShapeRepresentation.RepresentationIdentifier = 'Body' IfcShapeRepresentation.RepresentationType = Typically 'Tessellation' or 'Brep'
Product Geometric Representation	General	The geometric representation of any IfcProduct is provided by the IfcProductDefinitionShape allowing multiple geometric representations. It uses the Product Placement concept utilizing IfcLocalPlacement to establish an object coordinate system, in which all geometric representations are founded.
Product Geometry Colour	General	No description available.
Product Geometry Layer	General	No description available.
Product Relative Positioning	General	If the IfcProduct Product Placement is placed relative to an IfcPositioningElement this relationship covers the information on which IfcPositioningElement positions the IfcProduct.
Product Span Positioning	General	No description available.
Box Geometry	General	No description available.
CoG Geometry	General	No description available.
Mapped Geometry	General	No description available.
Object Typing	General	This concept can be applied to the following resources: IfcTypeProduct
Product Local Placement	General	No description available.
Product Topology Representation	General	No description available.
Property Sets for Objects	General	This concept can be applied to the following resources: Pset_Risk Pset_Tolerance Pset_Uncertainty
Quantity Sets	General	This concept can be applied to the following resources: Qto_BodyGeometryValidation
Reference Geometry	General	No description available.
Reference SweptSolid Geometry	General	No description available.
Reference SweptSolid PolyCurve Geometry	General	No description available.
Reference Tessellation Geometry	General	No description available.
IfcSpatialElement (11)
Body Geometry	General	A spatial element will not usually provide a body geometry, instead relying on its constituting elements. A body geometry may be provided if it is necessary to expose an independent geometric representation. This geometry is typically expressed by its exterior elements or volume boundary.
FootPrint GeomSet Geometry	General	No description available.
Group Spatial Connectivity	General	No description available.
Property Sets for Objects	General	This concept can be applied to the following resources: Pset_AirSideSystemInformation Pset_SpaceFireSafetyRequirements Pset_SpaceAirHandlingDimensioning Pset_SpaceThermalLoad Pset_SpaceCoveringRequirements Pset_SpaceHVACDesign Pset_SpaceLightingDesign Pset_SpaceOccupancyRequirements Pset_SpaceCommon Pset_ThermalLoad
Spatial Interference	General	No description available.
Spatial Interference With Zones	General	No description available.
Object Typing	General	This concept can be applied to the following resources: IfcSpatialElementType
Property Sets for Performance	General	This concept can be applied to the following resources: Pset_SpaceThermalLoadPHistory Pset_SpaceThermalPHistory
Spatial Container	General	This concept can be applied to the following resources: IfcAnnotation IfcElement IfcGrid
Spatial Element Attributes	General	No description available.
Spatial Service Connectivity	General	No description available.
IfcSpatialStructureElement (2)
Property Sets for Objects	General	This concept can be applied to the following resources: Pset_PropertyAgreement
Object Typing	General	This concept can be applied to the following resources: IfcSpatialStructureElementType
Click to show 47 hidden inherited concepts Click to hide 47 inherited concepts
IfcSpace (11)
FootPrint GeomSet Geometry	General	The following constraints apply to the 2D representation: An IfcBoundedCurve is required, using IfcPolyline for faceted space contours or IfcCompositeCurve for space contours with arc segments. For spaces with inner boundaries, a set of IfcBoundedCurve's is used, that should be grouped into an IfcGeometricCurveSet.
Product Local Placement	General	The local placement for IfcSpace is defined at 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 to the local placement of the IfcSpatialStructureElement of type IfcBuildingStorey or IfcSite if relative placement is used. If the relative placement is not used, the absolute placement is defined within the world coordinate system.
Property Sets for Objects	General	This concept can be applied to the following resources: Pset_ProcessCapacity Pset_BerthCommon (only applies to BERTH) Pset_FenderDesignCriteria (only applies to BERTH) Pset_SpaceParking (only applies to PARKING)
Quantity Sets	General	This concept can be applied to the following resources: Qto_SpaceBaseQuantities
Space Attributes	General	No description available.
Space Boundaries 1st Level	General	No description available.
Space Boundaries 2nd Level	General	No description available.
Spatial Composition	General	By using the inverse relationship IfcSpace.IsDecomposedBy it references IfcSpace by IfcRelAggregates.RelatedObjects. If it refers to another instance of IfcSpace, the referenced IfcSpace needs to have a different and lower CompositionType, i.e. ELEMENT (if the other IfcSpace has COMPLEX), or PARTIAL (if the other IfcSpace has ELEMENT). This concept can be applied to the following resources: IfcProject IfcSite IfcBuilding IfcBuildingStorey IfcSpace IfcFacility IfcBridge IfcMarineFacility IfcRailway IfcRoad IfcFacilityPartCommon IfcBridgePart IfcMarinePart IfcRailwayPart IfcRoadPart
Spatial Container	General	If there are building elements and/or other elements directly related to the IfcSpace (like most furniture and distribution elements), they are associated with the IfcSpace by using the objectified relationship IfcRelContainedInSpatialStructure. The IfcSpace references them by its inverse relationship: IfcSpace.ContainsElements -- referencing any subtype of IfcProduct (with the exception of other spatial structure element) by IfcRelContainedInSpatialStructure.RelatedElements.
Spatial Decomposition	General	By using the inverse relationship IfcSpace.Decomposes it references IfcSite || IfcBuildingStorey || IfcSpace by IfcRelAggregates.RelatingObject. If it refers to another instance of IfcSpace, the referenced IfcSpace needs to have a different and higher CompositionType, i.e. COMPLEX (if the other IfcSpace has ELEMENT), or ELEMENT (if the other IfcSpace has PARTIAL). This concept can be applied to the following resources: IfcSpace
Object Typing	General	This concept can be applied to the following resources: IfcSpaceType

5.4.3.64.7 Formal representation

ENTITY IfcSpace
 SUBTYPE OF (IfcSpatialStructureElement);
	PredefinedType : OPTIONAL IfcSpaceTypeEnum;
	ElevationWithFlooring : OPTIONAL IfcLengthMeasure;
 INVERSE
	HasCoverings : SET [0:?] OF IfcRelCoversSpaces FOR RelatingSpace;
	BoundedBy : SET [0:?] OF IfcRelSpaceBoundary FOR RelatingSpace;
 WHERE
	CorrectPredefinedType : NOT(EXISTS(PredefinedType)) OR
 (PredefinedType <> IfcSpaceTypeEnum.USERDEFINED) OR
 ((PredefinedType = IfcSpaceTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType));
	CorrectTypeAssigned : (SIZEOF(IsTypedBy) = 0) OR
  ('IFC4X3_DEV_c85b862.IFCSPACETYPE' IN TYPEOF(SELF\IfcObject.IsTypedBy[1].RelatingType));
END_ENTITY;

5.4.3.64.8 References

• IfcRelCoversSpaces
• IfcSpaceBoundarySelect
• IfcSpatialStructureElement