Construction Supervisor License Practice Exam

What is the number 17 on a steel framing square used for?

1. To lay out hip and valley rafters

2. To lay out a 3, 4, 5 right triangle

3. To lay out the rise and run of a stairway stringer

4. To square a wall

The correct answer is: To lay out hip and valley rafters

The number 17 on a steel framing square is specifically utilized for laying out hip and valley rafters. In the context of roofing, hip and valley rafters are crucial for forming the angles and ensuring that the roof structure is properly supported and aligned. When constructing a roof with slopes, using the 17 measurement helps accurately determine the angle at which these specific rafters need to be cut. It aids the builder in laying out the exact geometry necessary to accommodate the design of the roof, taking into consideration the pitch and the intersections where hips and valleys meet. Understanding the practical application of the steel framing square, especially in relation to rafter layouts, is essential for constructing roofs that are both aesthetically pleasing and structurally sound. This practical knowledge is vital for making precise cuts and achieving the desired angles, which leads to a more efficient building process and longevity of the roof structure.