Roll out and cut roll roofing to cover the length of the roof.
How to remove roll roofing.
How to remove old flat roofing.
How to remove repair and install a flat roof.
When you re finished trimming test the edges to see if you can lift them.
Make sure you offset yo.
Use your razor knife to remove any excess rolled roofing.
And tie it into your hip roof.
Take special note of the corners and edges of the roof.
Clean the rolled roofing before you finish.
Flat roofing has some advantages but when it ages or falls into disrepair it can be troublesome.
Pry up the ends and pull off the cap.
Place the top edge of the roofing along the chalk line.
Remove the ridge shingles or roofing cap.
Leaks form and the materials erode into something that is better.
This should give you a 1 inch overhang on the eaves including the top edge.