Autodesk 00128-051462-9310 - AUTOCAD 2008 COMM UPG FRM 2005 DVD, User Manual

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Net Area (NTA)
The following rules apply to the generation of net boundaries with the SIS standard:
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The net boundaries are measured to the inside of the wall.
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If wall openings have a width larger than or equal to 1.50m, the net boundaries are offset to the center of the wall.
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If doors have a width larger than or equal to 1.50m, the net boundaries are offset to the inside of the door frame.
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If wall openings have a width smaller than 1.50m, the net boundaries are measured to the inside of the wall.
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If columns are set to bound spaces, as described in “ Setting an Object Style as Bounding ” on page 1590 and “ Setting
an Object Instance as Bounding ” on page 1590, the area of the column will be subtracted from the net area.
Usable Area (BRA)
The following rules apply to the generation of usable boundaries with the SIS standard:
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The usable boundaries of a space are offset 0.15m into the wall if the space has an adjacent space. If the width of
the wall is less then 0.30m the offset will be to the center of the wall. If there is no adjacent space, the usable
boundaries are measured to the inside of the wall.
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