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A curtain wall is a wall of a building which is an assembly of components, hung from the edge of the floor/roof structure rather than bearing on a floor. Curtain wall is represented as a building element assembly and implemented as a subtype of IfcBuildingElement that uses an IfcRelAggregates relationship. A curtain wall is often external, but using Pset_CurtainWallCommon.IsExternal can be used to define interior curtain walls.{ .extDef}NOTE Definition according to ISO 6707-1: non load bearing wall positioned on the outside of a building and enclosing it. HISTORY New entity in IFC2.0The geometric representation of IfcCurtainWall is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Independent 'Body' geometric representation, as described below, should only be used when the IfcCurtainWall is not defined as an aggregate. If defined as an aggregate, the geometric representation is the sum of the representations of the components within the aggregate.The geometric representation of IfcCurtainWall is defined using the following multiple shape representations for its definition:Axis: A two-dimensional open curve (for restrictions see below) defining the axis for the curtain wall. This is an optional representation for curtain walls. Body: A surface model or boundary representation model representation defining the 3D shape of the curtain wall. If the IfcCurtainWall has components (referenced by SELF\IfcObject.IsDecomposedBy) then no independent shape representation with RepresentationType = 'Body' shall be defined. The body of IfcCurtainWall is then geometrically represented by the shape representation of its components. The components are accessed via SELF\IfcObject.IsDecomposedBy[1].RelatedObjects. If the IfcCurtainWall has no components defined (empty set of SELF\IfcObject.IsDecomposedBy) then the IfcCurtainWall may be represented by an shape representation with the RepresentationIdentifier ='Body'.


Acoustic rating for this object. It is provided according to the national building code. It indicates the sound transmission resistance of this object by an index ratio (instead of providing full sound absorption values).

Indication whether the object is made from combustible material (TRUE) or not (FALSE).

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

Area of the wall as viewed by an elevation view of the middle plane of the wall. It does not take into account any wall modifications (such as openings).

Characteristic height

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.

The length of the object.

Area of the object as viewed by an elevation view of the middle plane of the object. It does take into account all object modifications (such as openings).

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.IFC4.3.0.0 DEPRECATION The Reference property is deprecated and shall no longer be used, use attribute Name on the relating type instead.

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).

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