Where is plastic gas pipe prohibited from being used?

The use of plastic gas pipe is prohibited under any building due to safety and regulatory considerations. The primary concern with using plastic gas piping in this context relates to the risk of a gas leak occurring without proper ventilation. If a leak happens beneath a building, there is potential for gas to accumulate in confined spaces, significantly increasing the risk of fire or explosion.

Construction codes and safety regulations typically require that natural gas lines be made of materials that can withstand the pressures involved and ensure that any potential leaks can be detected and vented away from living and working spaces. Metal piping is commonly preferred for underground applications as it is not only durable but also allows for better monitoring of gas leaks. Such regulations aim to enhance safety for all occupants and reduce the risk of catastrophic events.