Underlayment and also Steel Roof-- Metal Roof Covering 101 with Todd Miller
https://station-wiki.win/index.php/Underlayment_and_also_Steel_Roof_Covering--_Metal_Roofing_101_with_Todd_Miller
By keeping rooftop temperatures a little bit cooler, shingle life can be maintained. This benefit does not actually have an influence on roof materials like metal, ceramic tile, and also slate which are untouched