It’s a two Tale house with two layers of old shingles that could have to be taken out ahead of new roof currently being set up. Start off laying the metal roofing panels, starting from the eaves and working your way up into the ridge. Use proper fasteners, such as https://residential-rubber-roof-i80134.tribunablog.com/new-step-by-step-map-for-top-rated-residential-roof-installation-49846431