What is the minimum thickness for un-reinforced masonry parapet walls?

The minimum thickness for un-reinforced masonry parapet walls is established to ensure adequate structural integrity and stability, especially given the elevated position of parapet walls which must withstand various loads such as wind, rain, and potential impacts. A thickness of 8 inches is specified because it provides sufficient mass and resistance against lateral forces, contributing to the wall’s overall durability and performance.

Opting for a thickness that is thinner than 8 inches could compromise the wall's strength and increase the risk of failure over time, especially under adverse weather conditions or when supporting additional architectural elements on the roof. Thus, adhering to the 8-inch thickness requirement helps ensure safety, code compliance, and longevity of the structure.