What is the primary material used for drainage pipes in residential plumbing?

The primary material used for drainage pipes in residential plumbing is PVC (Polyvinyl Chloride). PVC is favored due to its excellent properties for plumbing applications. It is lightweight, making it easier to handle and install. Furthermore, PVC is resistant to corrosion and chemical damage, which is crucial for drainage systems that may transport various waste products.

PVC pipes also have a smooth interior surface, which helps prevent clogs and allows for efficient flow of water and waste. This reduces the chances of build-up, making maintenance easier over time. Moreover, PVC is cost-effective compared to many other materials, which contributes to its widespread use in residential construction.

While other materials like cast iron and ABS have their applications, PVC's combination of durability, ease of installation, and low cost makes it the primary choice for drainage systems in most residential settings.