Corrugated roofing is made of overlapping sheets of metal, iron, steel, aluminum or fiber glass, which are joined together at the sides. The term “corrugated” refers to the shape of the roofing panels, which are a series of concave half-round shapes (grooves) alternating with convex half-round shapes (ridges), with their curves smoothly transitioning into one other. Corrugated roofing is used for roofs that have pitches of 3 to 12, or greater—with the pitch corresponding to the inclination and slope of the roof.
Corrugated roofs are available in several quality grades of metal, translucent plastic, iron, galvanized steel and fiber glass; tile thicknesses; and the thickness of the galvanization (outer, protective coating). According to Gilbert Brys in the book “Fiber and Micro-Concrete Roofing Tiles,” corrugated roofing sheets range in thicknesses from 0.15mm to 1.22mm, while the thickness of the galvanized coating lies within the range of 60 microns.