Standing Seam Metal Roofing
3. Inspection of standing seam metal roof systems: "ROOFER Inventory Procedures and Inspection Manual for Metal Panel Roofing", available for download, is an extremely detailed and valuable resource put together by the US Army Corps of Engineers' Engineer Research and Development Center.
4. Technical: "Metal Roof Installation Manual" is probably the best, most thorough introduction to metal roofing you can find on the internet. Produced by the Metal Construction Association in 2014, it is available to MCA members as a free download from their Technical Resources page, but you can also view it on the ATAS International website.
5. Technical: "Technical Instructions - Structural Considerations for Metal Roofing", prepared by the US Army Corps of Engineers; produced in 1998. From the document: "This document prescribes the criteria and procedures for designing metal roofs for buildings".
6. Technical: See this instructive page for technical information about a fairly typical standing seam metal roof system at the Petersen Aluminum website.