What material is recommended for drain waste vent (DWV) piping?

The recommended materials for drain waste vent (DWV) piping are PVC (Polyvinyl Chloride) or ABS (Acrylonitrile Butadiene Styrene). These materials are favored in plumbing systems because they are lightweight, resistant to corrosion, and do not require special tools for cutting and joining. PVC and ABS are also cost-effective options that can be easily installed, making them practical for residential and commercial plumbing applications.

Additionally, both materials provide sound insulation, reducing noise associated with wastewater flow, which is an important consideration in building design. Their chemical resistance further ensures longevity and reliability in handling various types of wastewater.

Cast iron and steel may be used in specific situations, often for their durability in certain commercial applications, but they can be heavier and more expensive, which complicates installation and provides less flexibility. Copper is also a durable material but is typically used for water supply lines rather than DWV systems due to its higher cost and susceptibility to corrosion over time in a waste environment. Thus, PVC and ABS stand out as the best options for DWV piping in most plumbing projects.