[Gwenne & Len]

Using house construction flashing approaches you would use a self attaching product like Ice & Water to flash over the curb - down the riser face and out across the roof an inch or so. To protect the Ice&Water from uv you would cover it with a z flashing of (white) aluminum flashing material sealed at the seams and around the perimeter of the intersection to the roof.
This or just the aluminum flashing applied squeezing a coating of sealant beneath it.
Are there drawbacks to either of these approaches? Our 05 uses un flashed wooden risers which seem contrary to quality construction practice.
Len