North Carolina Building Contractor License Practice Exam

What is the maximum slope for permanent fill?

1. 2 feet

2. 3 feet

3. 4 feet

4. 5 feet

The correct answer is: 4 feet

The maximum slope for permanent fill is governed by safety and stability considerations. A slope of 4 feet is typically accepted as the standard maximum for permanent fill, allowing for adequate drainage and avoiding erosion that can compromise the integrity of the fill material. Slopes that are too steep may lead to landslides or erosion, and thus the 4-foot maximum provides a balance between efficiency and safety in construction practices. When assessing the other options, they present slopes that are either too gentle or could lead to stability issues. For instance, a 2-foot slope might not provide the necessary stability in cases where the height of the fill demands a more gradual slope for safety. Meanwhile, while slopes of 3 feet and 5 feet are also common practices in various contexts, they can pose risks or be unsuitable depending on specific circumstances around the fill’s intended use and environmental conditions. Therefore, adhering to a maximum slope of 4 feet ensures compliance with safety standards in the construction industry.