Galvanized/Galvalume roof sheet

Corrugated galvanized iron or steel is a building material composed of sheets of hot-dip galvanized mild steel, cold tolled to produce a linear corrugated pattern in them. Although it is still popularly called "iron" in the UK, the material used is actually steel (which is iron alloyed with carbon for strength, commonly 0.3% carbon), and only the surviving vintage sheets may actually be made up of 100% iron. The corrugations increase the bending strength of the sheet in the direction perpendicular to the corrugations, but not parallel to them, because the steel must be stretched to bend perpendicular to the corrugations. Normally each sheet is manufactured longer in its strong direction.

CGI is lightweight and easily transported.