Material Function Assignment Enumeration

Member name	Value	Description
Finish1	4	Default priority = 4
Finish2	5	Default priority = 5 (The lowest effective priority)
Insulation	3	Default priority = 3
Membrane	100	A membrane layer must have thickness 0. It is not represented graphically.
None	0	Default priority = 0 This is deprecated and should not be used.
StructuralDeck	200	Default priority = 1. Indicates layer is a structural deck.
Structure	1	Default priority = 1 (The highest effective priority)
Substrate	2	Default priority = 2

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.

Reference