[header] How to install corrugated metal roofing [title] Prepare the roof surface by removing any old roofing, any rotten wood, and adding roofing felt to the entire surface. [substeps] Roofing felt is a cheap and easy-to-install material: simply nail the sheets into wood, overlapping each sheet by 3 to 4 inches (or about 10 cm). [title] Calculate the number of sheets of corrugated metal needed. 
[step] Divide the area of your roof by the size of the sheets you will be using. Remember that you will want the metal sheets to overlap.