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The height of a parapet wall is primarily influenced by building codes. These codes are established to ensure safety, structural integrity, and compliance with regulations related to fire safety, wind resistance, and overall building design. For example, codes may dictate specific heights for parapet walls to protect against potential hazards, such as falling debris or to mitigate wind uplift on the structure. Compliance with these codes is crucial for obtaining permits and ensuring the safety of the building and its occupants.

While aesthetic preference, roof type, and material used may play roles in the design and functionality aspects of a parapet wall, they are typically secondary to the regulatory requirements outlined in building codes. Aesthetic considerations might influence the final design, but those designs must still adhere to the minimum height regulations set forth in the codes. Similarly, different roof types or materials may allow for variances in design, but again, the primary governing factor remains the safety and legal standards established by the applicable building codes.