For a building drainage system, which material is most commonly used for drainage pipes?

PVC, or polyvinyl chloride, is most commonly used for drainage pipes in building drainage systems due to several key advantages it offers. One significant benefit of PVC is its resistance to corrosion, which makes it ideal for handling wastewater and various drainage applications. Unlike metal pipes, PVC does not rust or corrode over time, ensuring a longer service life and reducing maintenance costs associated with replacements or repairs.

Additionally, PVC pipes are lightweight, making them easier to transport and install compared to heavier materials like cast iron or galvanized steel. This can lead to reduced labor costs during installation. PVC is also available in various sizes and can be easily connected to other plumbing fittings, providing flexibility in design and layout.

Furthermore, the smooth interior surface of PVC pipes enhances flow efficiency while minimizing blockages, which is crucial for any drainage system. These qualities combined make PVC the preferred choice for many contractors and plumbers when selecting materials for drainage systems in buildings.