Steel Roofing Systems?????

Hi, I’m studying architecture and I’ve been asked to research “steel roofing systems” as a project for Design Technology! Can somebody please tell me what exactly is meant by “steel roofing systems”?? Are there certain types? I have to analyse “steel roofing systems” under the headings [1] durability [2] finishes [3] availability [4] examples and [5] detailing. If somebody can please give me a brief explanation of “steel roofing systems”, I would greatly appreciate it, as I will then be able to research the topic further myself. I’m hesitant to go ahead and research steel construction, in case there are certain systems that I should be dealing with.

Any help will be greatly appreciated!!

PS I’m relatively new to Archiseek and although I did try to use the search facility, it said that there were no matches for previous threads regarding steel roofing systems, so if I have done the search wrong, I apologise in advance! 😮