Example: Elastophene PS has a poly film on the top for heat applied cap-ply installations. The bottom is sanded for hot asphalt application.
SP would be just the opposite with the sanded surface on top and the poly film on the bottom side of the sheet.
Soprafix sheets are mechanically attached.
Sopralene Flam Stick or Sopralene Stick products can be self adhered and a heat applied cap or can be heat applied and a hot or cold applied cap.