What is the material requirement for piping that passes through fire-rated walls?

The material requirement for piping that passes through fire-rated walls is that it must be double-wrapped. This measure ensures that the integrity of fire-rated barriers is maintained, thereby preventing the spread of fire and smoke through openings where pipes may penetrate. Double-wrapping involves using appropriate firestop materials that can withstand high temperatures, effectively sealing gaps and maintaining the fire-resistance rating of the wall.

The rationale for this requirement stems from the need for safety in buildings, particularly to comply with fire codes, which mandate that any penetrations through fire-rated assemblies must be adequately protected. Firestop systems are designed to seal these openings while also allowing for movement and flexibility in the piping, as thermal expansion can occur.

Choosing PVC piping would not meet the fire-resistance requirements typically mandated for such applications. Metal piping, while often necessary for certain gas lines, is not sufficient by itself without proper firestop measures. Insulation alone does not provide the same level of protection and does not address the integrity of the fire barrier. Therefore, double-wrapping is the most appropriate choice to ensure compliance with fire safety regulations.