Air volumes of MEP spaces with sandwich floors are not determined correctly

Problem

During building detection, the air volumes of MEP spaces with sandwich floors are not correctly determined. The air volume calculated for the MEP space is zero.

Possible cause: Starting point for detection of the MEP space

When detecting MEP spaces, the program searches for a room bounding component on the vertical axis from a given reference point. For example, if you defined the room from the top of its first floor layer and then constructed additional layers of floor on top of it, the MEP could cannot extend beyond the top layer because it represents a room boundary. The volume of the room is calculated as zero accordingly.

Solution

You can determine the height at which Revit begins the search for room bounding components on the vertical axis via the computation height of the respective level. Set the calculation height to at least the height of the top edge of the finished floor so that the whole room can be detected.
Tip: Alternatively, you can define the MEP space again from the top of the finished floor or use an auxiliary plane on the top of the finished floor.