What type of roof is most likely to have parapet walls?

Flat roofs are most likely to have parapet walls because these structures are commonly designed for drainage, aesthetics, and fire safety. Parapet walls extend above the roof level and can help to contain water and prevent it from running off into adjacent areas. Additionally, they provide a barrier against falling hazards and can enhance the overall structural integrity by protecting the edges of the roof.

In commercial and industrial buildings with flat roofs, parapet walls are often used to hide equipment and provide a safer environment. These features are typically absent or less common in pitched, gabled, or thatched roofs, where the roof design and slope do not necessitate the same type of edge protection or aesthetic consideration that parapet walls offer. Thus, flat roofs and their associated design needs directly lead to the prevalence of parapet walls in those constructions.