What is the primary reason for sealing the space between gas piping and the building?

The primary reason for sealing the space between gas piping and the building is to prevent the entry of gas or water. Proper sealing ensures that if there is a leak in the gas piping, the gas is contained and does not enter the living or working space, reducing the risk of fire or explosion. Additionally, sealing helps to prevent water, which can cause corrosion or damage to the gas pipes, from entering the building. This practice enhances overall safety and integrity of the gas piping system, complying with safety standards and best practices in gas installations.

While enhancing security, improving aesthetic appeal, and facilitating maintenance are relevant considerations in construction and piping installation, they do not encompass the critical safety aspects that sealing against gas and water intrusion provides. Ensuring the safe operation of gas systems is paramount and is the reason behind this sealing requirement in the National Fuel Gas Code.