GI (Galvanized Iron) and GL (Galvalume) steel sheets are both types of metal roofing sheets commonly used in construction.

GI steel sheets are made from plain carbon steel sheets coated with a layer of zinc through a process called galvanization.

The zinc coating provides excellent corrosion resistance, protecting the underlying steel from rust and corrosion.

GL steel sheets are made from carbon steel sheets coated with a combination of aluminum and zinc through a process called hot-dip galvanization.

The aluminum-zinc coating provides enhanced corrosion resistance and heat reflectivity compared to traditional galvanized coatings.

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