Ace the Illinois Roofing Practice Exam 2026 – Nail It and Soar to New Heights!

To determine the amount of net drip edge required for a hip roof measuring 40 feet by 20 feet, we first need to understand the configuration of a hip roof. A hip roof has sloping sides that meet at the top, which tends to require drip edge installation along all the eaves and rakes.

For a roof with two sets of parallel sides, the total perimeter can be calculated as follows:

1. Calculate the lengths of all sides of the roof. A hip roof has two lengths of 40 feet and two lengths of 20 feet.

2. Therefore, the total perimeter is:

- 2 times 40 feet (the longer sides) equals 80 feet,

- 2 times 20 feet (the shorter sides) equals 40 feet.

3. Adding these together gives us:

- 80 feet + 40 feet = 120 feet.

Since drip edge needs to be installed around the entire perimeter of the roof, the total amount required is 120 feet.

This understanding of how to calculate the perimeter of the roof and the application of drip edge requirements clarifies why 120 feet is the appropriate choice for this scenario.