This should give you a 1 inch overhang on the eaves including the top edge.
How to remove roll roofing.
If you can lift the edges use some more cement to seal them in place.
Clean the rolled roofing before you finish.
Pry up the ends and pull off the cap.
Place the top edge of the roofing along the chalk line.
Make sure you offset yo.
And tie it into your hip roof.
Remove the ridge shingles or roofing cap.
How to remove repair and install a flat roof.
When you re finished trimming test the edges to see if you can lift them.
This is a long video but it will show you how to do it.
Use your razor knife to remove any excess rolled roofing.
Flat roofing has some advantages but when it ages or falls into disrepair it can be troublesome.
This will either be laid out shingles or rolled roofing folded over the peak of the roof.
Take special note of the corners and edges of the roof.