Specifies the value of the tread width excluding the width of independent side supports. 
Namespace: Autodesk.Revit.DB.Architecture
Assembly: RevitAPI (in RevitAPI.dll) Version: 24.0.0.0 (24.0.0.0)
Since:  2013 
Syntax
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Field Value
The actual width of the stairs run, 0.0 if the run is a sketched run.Exceptions
| Exception | Condition | 
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| Autodesk.Revit.ExceptionsArgumentOutOfRangeException | When setting this property: The given value for runWidth must be greater than 0 and no more than 30000 feet. -or- When setting this property: The runWidth is too small or too large to be used as actual run width, probably it doesn't satisfy the layout generation restriction of the stairs run. | 
| Autodesk.Revit.ExceptionsInvalidOperationException | When setting this property: The stairs run is sketched so the data being set is not applicable. |