How Room Volume Is Computed - Autodesk 256B1-05A761-1301 - AutoCAD Revit Structure Suite 2010 User Manual

above. Also, rooms in the building model should be defined to the center line of bounding walls and from
floor height to floor height, so that there are no gaps between the spaces in a building. You can examine a
shaded 3D analytical model in the gbXML Export dialog to detect gaps. When there are gaps in the analytical
model, you must adjust the room properties in the building model to correct the volume.
Related topics
Analyzing a Conceptual Design
Room Volumes for Design Options
Exporting Your Design to gbXML

How Room Volume is Computed

Because volume computation may affect Revit Architecture performance, it is turned off by default. Turn it
on only when you want to prepare and print schedules or other views that report room volumes. To turn
on volume computation, see
When it computes room volumes, Revit Architecture does the following:
Determines the room area. See
NOTE Room volumes are computed to the wall finish, regardless of the Room Area Computation setting.
Determines the room height. See
in Room Volume Computations
Uses the room area and the room height to compute the room volume.
Situations That Can Affect Room Volume Computations
In a few cases, the room volume that Revit Architecture computes may not reflect unique features of a room.
For example, if a room-bounding element does not reach the upper boundary of the room, space above the
element may not be included in the room volume.
For example, if a partial wall or architectural column that does not reach the ceiling or roof is defined as
room-bounding, Revit Architecture does not include the space above the element in the room volume. In
the following section view, the green columns do not reach the roof, and the white space above them
indicates space that Revit Architecture omits from the room volume computation.
To avoid this situation, turn off the Room Bounding parameter for the elements. (Right-click the element,
and click Element Properties. Clear the Room Bounding parameter, and click OK.) In this case, the volume
of those elements (and the space above them) is included in the room volume computation.
992 | Chapter 16 Rooms and Areas
on page 594
on page 1324
on page 1372
Enabling Volume Computations
Room Area on page 989.
Defining Room Height
on page 996.
on page 993.
on page 993 and Considering Ceilings and Floors