What does a metal chimney with a thickness of less than 3/16 inch require?

A metal chimney with a thickness of less than 3/16 inch requires protection in the standard manner because thinner materials are more vulnerable to thermal expansion and the erosive effects of combustion gases. Standard protection methods often include applying lightning protection systems, which may involve the installation of grounding systems and bonding to ensure safe discharge of electrical currents. The standard approach ensures the chimney is safeguarded against potential lightning strikes, which can cause significant damage to structures, especially those made of thinner metal.

In contrast, options suggesting no protection or requiring a special coating do not adequately address the heightened risk associated with thinner metals. Similarly, suggesting a thicker lining, while it may improve durability, does not inherently provide the necessary protective measures against electrical strikes, making it an incomplete solution for this requirement.