Used in class CompoundStructure to specify the function of a layer. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2012 
Syntax
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Members
| Member name | Description | 
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| None | Priority = 0 This is deprecated and should not be used. | 
| Structure | Priority = 1 (highest priority) | 
| Substrate | Priority = 2 | 
| Insulation | Priority = 3 | 
| Finish1 | Priority = 4 | 
| Finish2 | Priority = 5 | 
| Membrane | A membrane layer must have thickness 0. It is not represented graphically. | 
| StructuralDeck | Indicates layer is a structural deck. | 
Remarks
 The function is used primarily to determine layer priority which affects how layers of distinct elements interact at a join. Typically, layers penetrate lower priority layers and merge with layers of the same priority.