2. General: "RICOWI Best Practices Guides for Roofing - Steep Slope Metal" is available on the website of the Insurance Institute for Business & Home Safety. ("RICOWI" stands for the Roofing Industry Committee on Weather Issues).
3. General: How to determine the area of a steep-slope roof: see this page.
5. Inspection of Asphalt Shingle Roofs: ROOFER: Steep Roofing Inventory Procedures and Inspection and Distress Manual for Asphalt Shingle Roofs is an extremely detailed and valuable resource put together by the US Army Corps of Engineers' Engineer Research and Development Center.