Apron flashings are the flashings that are used when the top of a roof butts up in to a vertical wall surface to prevent water getting in below the beginnings of the roof sheets or tiles it is typically a flat vertical surface of 200mm with a 180mm horizontal outward kick and and a 20mm downturn the downturn prevents the outward kick from buckling and getting a 'wavy' look to it.

Order the apron flashing with the internal angle being greater than 90 degrees to allow for the downward pitch of the roof add the pitch of the roof to 90 degrees when ordering.