The characteristics implemented in a roof depends upon the intended use of the architectural structure.
How to build a metal roof gazebo.
Drill pilot holes and insert 3 1 2 galvanized screws into the 4 4 posts.
A roof is the uppermost part of a building that provides shelter and protection from the heat rain wind a variety of weather conditions.
Have one of those 180 steel framed 10 x 10 two tier roof gazebos that every retailer seems to sell now a days.
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.
For instance a pergola or verandah is designed to admit only partial sunlight.
Problem is the nylon top keeps deteriorating and then shreds and has to be replaced.