Build the roof as normal with the trim felt paper and metal flashing.
How to install metal roof on a shed.
Most metal shingles will be attached to the roof using metal shingle.
Our latest shed is also a pavilion and you can build it too.
If you want to install steel over asphalt your best choice for installing metal roofing is to use a steel shingle system like the one shown instead of the more common and more expensive standing seam steel.
In a standing seam roof long single panels run.
Then attach the metal roof material with screws make for roofing.
Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps.
Allow for at least 1 foot extra all the way around.
Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails.
Then trim all edges of the roof with metal trim made for that purpose.
My workshop shed is under a large tree constantly being attacked by falling cones and bird droppings.
Measure the roof to determine how much metal you will need.
This video shows how i installed a metal panelled roof.
You might have to stagger the metal and cut one or both outside edges to get the correct overall width.