A C-purlin is a structural member used in construction, often as a support for roofs and walls. The “C” shape provides excellent strength and stability, making it a preferred choice for many builders. The thickness of the purlin, such as the 2.4mm option, influences its load-bearing capacity and durability. Galvanization involves coating the steel with zinc to enhance its resistance to corrosion, making it suitable for harsh environments, especially in coastal areas like Singapore.