The flat roofing material must go up the wall a minimum of 12 or up the wall and over the top of the wall if the wall is less than 12 high.
How to attach a metal roof to a wall.
Here is an attempt though maybe not a very good one to make the roof flashing serve also as a through the wall flashing with a tile roof.
How to attach roof shingles to a tool shed how to build a tin roof cover tin roofs feature corrugated sheet metal installed with the grooves running downward to encourage water to drain off the roof.
Then cover the entire roof with a layer of insulation and secure it with a staple gun.
Make sure the panel is square to the eave of the roof so that all of panels installed afterwards are straight.
Next use 1 inch nails to secure some metal edging to the perimeter of the roof.
Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails.
Remember sealant tape goes between all layers of metal.
Now we can install our roof panels.
Apply the sealant tape along the center of the entire eave and remove the tape backing.
Metal roofing is also available in the form of shingles.
Follow the photo for illustrated instructions.
Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps.
Install base flashing under shingles or over metal roofing material.