All the same rules of flashing apply except only the measurements of chase depth and drop are required.
Fitting roof window flashing.
Http www fixmyroof co uk install roof flashings this video shows you the basics of installing lead roof flashings simple apron flashings or cover flashin.
Roof flashing is a thin material usually galvanized steel that professional roofers use to direct water away from critical areas of the roof wherever the roof plane meets a vertical surface like a wall or a dormer.
Secure the flashing as instructed with nails or roof cement.
Finally fit the flashing above the frame.
Unpack the window and flashing kit in the loft.
Then move up the sides of the frame.
When fitting flashings to flat roofs no overlap onto the roof is required as the roof itself will have it s own upstand flashing built into it.
Flashing is installed to surround roof features such as vents chimneys and skylights.
Once the roof window is unpacked only carry it by lifting it from the underside of the baseplate and store flat on the floor.