How many feet should chimneys terminate above the highest point where they pass through the roof surface?

Chimneys must terminate at a specific height above the roof to ensure safe and effective venting of combustion gases. The requirement is that a chimney should extend at least three feet above the highest point of the roof surface where it penetrates. This height is critical because it helps to prevent downdrafts, ensures that smoke and gases can escape effectively, and minimizes the risk of structural fire hazards. By exceeding this height, the chimney is less likely to disturb the airflow around the roof, which is especially important in windy conditions. This standard is part of building codes and safety regulations designed to protect both life and property from hazards associated with chimneys.