Definition
Asbestos sheets: these are roofing sheets that are made from a soft, grey, mineral that are used as a building material. When made into solid sheets they become good protection or insulation against fire and heat.
Tiles: these may be made from asbestos, concrete, wood, etc.
Iron sheets: usually galvanized iron sheets or can be corrugated. These are the lightest roofing materials and can be obtained in length from 1.2 meters to 3.6 meters. Large lengths can be obtained on specific order. They can also be used on walls when flat.
Concrete: This is a kind of roof made from strong tangible solid material made out of cement, sand, gravel etc.
Grass/Straw/Thatch: a traditional roofing material that works well at angles of 35 degree and more with thatch thickness of 12 centimeters to 15 centimeters. The thatch thickness increases with the decline in angle.