General Contractor Practice Exam

How far above the roof line must a parapet wall extend where it meets the roof?

1. 24 inches

2. 30 inches

3. 36 inches

4. 42 inches

The correct answer is: 30 inches

A parapet wall is a low wall that extends above the roofline, often serving as a safety feature and a barrier against wind uplift or fire. The specific height requirement for a parapet wall depends on local building codes, which are influenced by factors such as the type of building, the surrounding environment, and safety standards. In many jurisdictions, a parapet wall should extend at least 30 inches above the roof line where it meets the roof. This height is generally considered adequate to prevent materials or equipment on the roof from being blown off and to provide a certain level of safety for individuals who may be working near the perimeter of the roof. The 30-inch height also promotes visibility and helps ensure that the wall is effective in preventing people from accidentally falling off the roof. While other heights, such as 24 inches, 36 inches, or 42 inches, could potentially serve similar functions, building codes typically stipulate a minimum of 30 inches as a standard practice. It is essential for contractors to be familiar with local building regulations to ensure compliance and safety in construction practices.