Which material is commonly used for gas piping in residential applications?

Galvanized steel is commonly used for gas piping in residential applications due to its durability and ability to withstand the pressures associated with gas systems. It provides good strength and resistance to corrosion, which is critical when transporting gases that might otherwise compromise weaker materials. Galvanized steel piping is tightly sealed at connections to prevent leaks, ensuring a safe distribution of natural gas or propane throughout the home.

Additionally, while PVC is often used for various plumbing applications, it is not suitable for gas piping due to its inability to withstand high temperatures and pressures. Fiberglass lacks the structural integrity required for gas transport and is typically used in different contexts, such as insulation. Cast iron, although strong and durable, is generally more common in older systems or specific applications but is not the preferred choice for modern residential gas piping due to its weight and susceptibility to rust. Thus, galvanized steel is favored for its combination of strength, resistance to environmental factors, and suitability for safe gas distribution.