6.1.3.12 IfcCovering

Bekleidung / Belag
Revêtement

A covering is an element which covers some part of another element and is fully dependent on that other element. The IfcCovering defines the occurrence of a covering type, that (if given) is expressed by the IfcCoveringType.

NOTE  Definition according to ISO ISO 6707-1: final coverings and treatments of surfaces and their intersections.

Coverings are elements with relationships to the covered element and the space on the other side, they may contain openings, assigned by IfcRelVoidsElement, material information, assigned by IfcRelAssociatesMaterial, and others.

EXAMPLE  Coverings include wall claddings, floorings, suspended ceilings, moldings and skirting boards.
NOTE  A more basic information about claddings, floorings, and ceilings of a space can be attached to IfcSpace's using the Pset_SpaceCommon properties. Then only a name can be provided and the covering quantities would be interpreted from the space quantities.

Coverings can be assigned to

NOTE  The mere containment relationship between an IfcCovering and an IfcSpace is created by using IfcRelContainedInSpatialStructure

The following guideline shall apply:

HISTORY  New entity in IFC1.0.
IFC2x CHANGE  The attribute PredefinedType is now optional and should only be inserted when no type information, given by IfcCoveringType, is assigned to the IfcCovering occurrence by IfcRelDefinesByType.

Common Use Definitions

The following concepts are inherited at supertypes:

 Instance diagram

Object Typing

The Object Typing concept applies to this entity.



Property Sets for Objects

The Property Sets for Objects concept applies to this entity as shown in Table 109.
PredefinedTypeName
 Pset_CoveringCeiling
 Pset_CoveringFlooring
 Pset_ConcreteElementGeneral
 Pset_PrecastConcreteElementFabrication
 Pset_PrecastConcreteElementGeneral
 Pset_Condition
 Pset_EnvironmentalImpactIndicators
 Pset_EnvironmentalImpactValues
 Pset_ManufacturerOccurrence
 Pset_ManufacturerTypeInformation
 Pset_PackingInstructions
 Pset_ServiceLife
 Pset_Warranty

Table 109 — IfcCovering Property Sets for Objects



Quantity Sets

The Quantity Sets concept applies to this entity as shown in Table 110.
Name
Qto_CoveringBaseQuantities

Table 110 — IfcCovering Quantity Sets



Spatial Containment

The Spatial Containment concept applies to this entity as shown in Table 111.
Structure
IfcSpace
IfcBuildingStorey
IfcBuilding
IfcSite

Table 111 — IfcCovering Spatial Containment

The IfcCovering has a containment relationship within the hierarchical spatial structure.



Material Layer Set Usage

The Material Layer Set Usage concept applies to this entity as shown in Table 112.
NameDescription
FrontOptional front-facing material of layer-based coverings such as drywall paper.
FillThe solid material of layer-based coverings such as drywall gypsum.
BackOptional back-facing material of layer-based coverings such as drywall paper.

Table 112 — IfcCovering Material Layer Set Usage

Coverings for surfaces (CEILING, FLOORING, CLADDING, CEILING, ROOFING) may have materials defined according to layers.



Material Profile Set Usage

The Material Profile Set Usage concept applies to this entity as shown in Table 113.
NameDescription
TrimProfile of trim such as crown molding or base molding.

Table 113 — IfcCovering Material Profile Set Usage

Coverings for edges (MOLDING, SKIRTINGBOARD) may have materials defined according to profiles.



Surface Geometry

The Surface Geometry concept applies to this entity.

The following additional constraints apply to the 'GeometricSet' representation of IfcCovering:

 

standard planar covering
EXAMPLE  Figure 181 illustrates a planar surface representation where the area of IfcCovering is given by an IfcPolyLoop for planar base surfaces (here provided by the IfcRelSpaceBoundary). The implicit planar surface of the IfcPolyLoop shall be identical with the planar surface defined by the IfcRelSpaceBoundary.

Figure 181 — Covering surface planar

standard cylindrical covering
EXAMPLE  Figure 182 illustrates a cylindrical surface representation where the area of the IfcCovering is given by an IfcSurfaceOfLinearExtrusion for cylindrical base surfaces (here given by the IfcRelSpaceBoundary, such as caused by a round wall).

Figure 182 — Covering surface cylindrical

 


Body SweptSolid Geometry

The Body SweptSolid Geometry concept applies to this entity.

The following additional constraints apply to the 'SweptSolid' representation of IfcCovering:

 

advanded solid covering
EXAMPLE  Figure 183 illustrates a body representation where the volume of IfcCovering is given by an IfcExtrudedAreaSolid for planar base surfaces (here given by the IfcRelSpaceBoundary). The extruded area (IfcArbitraryClosedProfileDef) shall be coplanar to the surface defined by the IfcRelSpaceBoundary.

Figure 183 — Covering body planar

 
advanced solid covering
EXAMPLE  Figure 184 illustrates a body representation where the volume of the IfcCovering is given by an IfcExtrudedAreaSolid for cylindrical base surfaces (here given by the IfcRelSpaceBoundary - such as caused by a round wall).

Figure 184 — Covering body circular

 



XSD Specification:

 <xs:element name="IfcCovering" type="ifc:IfcCovering" substitutionGroup="ifc:IfcBuildingElement" nillable="true"/>
 <xs:complexType name="IfcCovering">
  <xs:complexContent>
   <xs:extension base="ifc:IfcBuildingElement">
    <xs:attribute name="PredefinedType" type="ifc:IfcCoveringTypeEnum" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>

EXPRESS Specification:

ENTITY IfcCovering
SUBTYPE OF IfcBuildingElement;
PredefinedType : OPTIONAL IfcCoveringTypeEnum;
INVERSE
CoversSpaces : SET [0:1] OF IfcRelCoversSpaces FOR RelatedCoverings;
CoversElements : SET [0:1] OF IfcRelCoversBldgElements FOR RelatedCoverings;
WHERE
CorrectPredefinedType : NOT(EXISTS(PredefinedType)) OR (PredefinedType <> IfcCoveringTypeEnum.USERDEFINED) OR ((PredefinedType = IfcCoveringTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType));
CorrectTypeAssigned : (SIZEOF(IsTypedBy) = 0) OR ('IFCSHAREDBLDGELEMENTS.IFCCOVERINGTYPE' IN TYPEOF(SELF\IfcObject.IsTypedBy[1].RelatingType));
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

Attribute Definitions:

PredefinedType : Predefined types to define the particular type of the covering. There may be property set definitions available for each predefined type.
NOTE  The PredefinedType shall only be used, if no IfcCoveringType is assigned, providing its own IfcCoveringType.PredefinedType.
CoversSpaces : Reference to the objectified relationship that handles the relationship of the covering to the covered space.
CoversElements : Reference to the objectified relationship that handles the relationship of the covering to the covered element.
IFC4 CHANGE Renamed into CoversElements for consistency.

Formal Propositions:

CorrectPredefinedType : Either the PredefinedType attribute is unset (e.g. because an IfcCoveringType is associated), or the inherited attribute ObjectType shall be given, if the PredefinedType is set to USERDEFINED.
CorrectTypeAssigned : Either there is no covering type object associated, i.e. the IsTypedBy inverse relationship is not provided, or the associated type object has to be of type IfcCoveringType.

Inheritance Graph:

ENTITY IfcCovering
ENTITY IfcRoot
GlobalId : IfcGloballyUniqueId;
OwnerHistory : OPTIONAL IfcOwnerHistory;
Name : OPTIONAL IfcLabel;
Description : OPTIONAL IfcText;
ENTITY IfcObjectDefinition
INVERSE
HasAssignments : SET OF IfcRelAssigns FOR RelatedObjects;
Nests : SET [0:1] OF IfcRelNests FOR RelatedObjects;
IsNestedBy : SET OF IfcRelNests FOR RelatingObject;
HasContext : SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions;
IsDecomposedBy : SET OF IfcRelAggregates FOR RelatingObject;
Decomposes : SET [0:1] OF IfcRelAggregates FOR RelatedObjects;
HasAssociations : SET OF IfcRelAssociates FOR RelatedObjects;
ENTITY IfcObject
ObjectType : OPTIONAL IfcLabel;
INVERSE
IsDeclaredBy : SET [0:1] OF IfcRelDefinesByObject FOR RelatedObjects;
Declares : SET OF IfcRelDefinesByObject FOR RelatingObject;
IsTypedBy : SET [0:1] OF IfcRelDefinesByType FOR RelatedObjects;
IsDefinedBy : SET OF IfcRelDefinesByProperties FOR RelatedObjects;
ENTITY IfcProduct
ObjectPlacement : OPTIONAL IfcObjectPlacement;
Representation : OPTIONAL IfcProductRepresentation;
INVERSE
ReferencedBy : SET OF IfcRelAssignsToProduct FOR RelatingProduct;
ENTITY IfcElement
Tag : OPTIONAL IfcIdentifier;
INVERSE
FillsVoids : SET [0:1] OF IfcRelFillsElement FOR RelatedBuildingElement;
ConnectedTo : SET OF IfcRelConnectsElements FOR RelatingElement;
IsInterferedByElements : SET OF IfcRelInterferesElements FOR RelatedElement;
InterferesElements : SET OF IfcRelInterferesElements FOR RelatingElement;
HasProjections : SET OF IfcRelProjectsElement FOR RelatingElement;
ReferencedInStructures : SET OF IfcRelReferencedInSpatialStructure FOR RelatedElements;
HasOpenings : SET OF IfcRelVoidsElement FOR RelatingBuildingElement;
IsConnectionRealization : SET OF IfcRelConnectsWithRealizingElements FOR RealizingElements;
ProvidesBoundaries : SET OF IfcRelSpaceBoundary FOR RelatedBuildingElement;
ConnectedFrom : SET OF IfcRelConnectsElements FOR RelatedElement;
ContainedInStructure : SET [0:1] OF IfcRelContainedInSpatialStructure FOR RelatedElements;
ENTITY IfcBuildingElement
INVERSE
HasCoverings : SET OF IfcRelCoversBldgElements FOR RelatingBuildingElement;
ENTITY IfcCovering
PredefinedType : OPTIONAL IfcCoveringTypeEnum;
INVERSE
CoversSpaces : SET [0:1] OF IfcRelCoversSpaces FOR RelatedCoverings;
CoversElements : SET [0:1] OF IfcRelCoversBldgElements FOR RelatedCoverings;
END_ENTITY;

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