Stairs   |  
 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: 25.0.0.0 (25.0.0.0)
| Exception | Condition | 
|---|---|
| ArgumentOutOfRangeException | 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. | 
| InvalidOperationException | When setting this property: The stairs run is sketched so the data being set is not applicable. |