The characteristics implemented in a roof depends upon the intended use of the architectural structure.
How to build a metal roof gazebo.
The first step of the project is to attach the 2 6 beams to the top of the posts.
Drill pilot holes and insert 3 1 2 galvanized screws into the 4 4 posts.
As you can see in the image we recommend you to clamp the beams to the posts after leveling them and aligning them at both ends.
Kind of like the one in the picture its perm attached over our hot tub.
For instance a pergola or verandah is designed to admit only partial sunlight.
Have one of those 180 steel framed 10 x 10 two tier roof gazebos that every retailer seems to sell now a days.