Used centering sheets are pre-owned, temporary molds for wet concrete, often made of steel, plywood, or metal, and are used in construction for support until the concrete cures. They are a cost-effective alternative to new sheets, available in various sizes and materials like steel, and can be reused, making them a popular choice for projects. What they are and why they are used Temporary molds: Centering sheets act as a temporary structure, or formwork, to give shape to wet concrete as it is poured. Support and curing: They hold the concrete in place and provide support until it hardens and becomes strong enough to be self-supporting. Commonly used for: They are used for horizontal surfaces like slabs and beams, while the term “shuttering“ is often used for vertical elements like columns and walls. Materials they are made of Steel: Commonly used for durable and strong formwork, made from high-quality mild steel. Plywood: A type of plywood specifically engineered for use in formwork, also known as centring plywood. Metal: A general term for durable, often steel or aluminum, sheets used in construction. Other materials: Historically, materials like wood and bamboo were used, but modern options like high-density polyethylene (HDPE) are also available, according to Justdial. Advantages of using used sheets Cost-effective: They are a more affordable option for builders compared to buying new sheets. Environmentally friendly: Using pre-owned sheets is a way to reuse materials. Reusable: They can be reused multiple times across different projects.