Voids element

Definition

The concept of 'Voids element' describes the connection between a building element (e.g. wall, slab) and the opening element that makes a void (hole) into it. This kind of relationship can be used to enable intelligent behavior in programs (if wall is moved then also all doors and windows in it are moved) or to enable more precise quantity takeoff (this is the area of the wall after deducting the openings from the total area of the wall).

The concept of "Fills element" then associates the doors and windows to the opening. The opening can also be empty.

Wall <Voids element > Opening element < Fills element > Door or window or nothing

Documents

• IFCR2_Containment_Grouping_Relationships_000206.pdf

Used by views

• Arch. design >> Quantities take off
• Arch. design >> Thermal load calculations / HVAC system design
• CAD / visualization

Data structure

IfcRelVoidsElement
GlobalId
OwnerHistory
Owner history [all]
RelatedIsDependent
RelatingIsDependent
RelatingBuildingElement
Floor slab [1,3,5]
Wall [1,3,5]
RelatedOpeningElement
Opening element [1,3,5]

Uses concepts

Opening element [1,3,5]
Owner history [all]

Used by concepts

Floor slab
Opening element
Roof slab
Wall

Copyright © 2000-2002 BLIS-Project [BLIS, Registered Organization]
Author: Jiri Hietanen (jiri@blis-project.org)
All rights reserved.