Iron cast and wrought iron are two distinctly different products both with specific purposes in construction.
Iron used for roofing.
Cast iron is melted poured and molded.
It is also rust resistant fire resistant and termite resistant.
This provides incredible strength and durability making it ideal for long lasting structures with wide open spaces.
Although it is still popularly called iron in the uk the material used is actually steel which is iron alloyed with.
Within the construction industry copper is most often used for cladding electrical wiring heating systems oil and gas lines rainwater systems and roofing.