Hold the end of a chalk line at one of the outermost top corners of the carport roof frame.
How to tie in metal roof to shingles.
I would also probably do a counter flash with ice shield over the tie in so if any water backs up under the shingles and rivers it way through the roof it won t come in as a leak at the metal roof.
Fixed with tar or caulk could cost a lot later to do it right duration.
Your metal roof can have this problem.
A metal shingles roof offers a unique look of conventional roof systems including composition shingles slate cedar shingles tiles and more.
Additionally a metal shingles roof will often cost less than a comparable in quality architectural standing seam roof while providing the same level of protection durability and longevity.
Instead it will flow right out ontop of the metal roof.
Also i always put ice shield under my metal roofs and especially under the tie ins.
String the line along the top of the frame until it meets the shingle roof.