Then attach the metal roof material with screws make for roofing.
How to put a steel roof on a shed.
By following the 10 simple instructions below you will be able to install a corrugated metal roof on your garage or shed.
Be sure the larger edge is laid so that the small edge of the next panel will overlap it.
Align the first metal roofing panel so that it overlaps the edging by 1 2 to 3 4 of an inch and is square to the roof line.
Install the roofing screws vertically along each rib in the panel.
You might have to stagger the metal and cut one or both outside edges to get the correct overall width.
Corrugated metal roof installation instructions.
Build the roof as normal with the trim felt paper and metal flashing.
Then trim all edges of the roof with metal trim made for that purpose.