Curb mounted skylights can be installed flat at 0 degrees.
Velux skylight minimum roof pitch.
All flashings custom flashing some clarification.
The roof pitch and the roofing material used are both important in determining the type of flashing needed.
The roof pitch is important because it ensures that the roof has the proper slope to effectively drain water off of both the flashing and the skylight.
For many skylight applications on flat roofs there should be a minimum pitch or fall of 0 6.
The recommended pitch for skylight installation on a flat roof.