Illinois Roofing Practice Exam

Which of these does the NRCA recommend when fastening a wood roofing system?

1. Using only glue for fastening.

2. Skipping fasteners on corners of the roofing system.

3. Determining fastener length based on unrelated factors.

4. Determine the length of the fasteners by thickness of all of the combined roofing materials.

The correct answer is: Determine the length of the fasteners by thickness of all of the combined roofing materials.

The correct choice emphasizes that the NRCA (National Roofing Contractors Association) recommends determining the length of fasteners based on the total thickness of all roofing materials being used. This practice ensures that the fasteners penetrate sufficiently into the substrate for a strong and secure attachment. Adequate length is crucial not only for performance and structural integrity but also for the longevity of the roofing system. Properly selected fastener lengths can help reduce the risk of failure, such as blow-offs or leaks, that can arise from inadequate fastening. Choosing fastener length based solely on unrelated factors could lead to improper installation, resulting in inadequate support for the roofing system. Similarly, relying on only adhesive without mechanical fasteners can compromise the system's stability, particularly in high-wind areas. Additionally, skipping fasteners on corners can create weak points in the roofing system, making it more vulnerable to damage. Thus, determining the fastener length appropriately is critical for ensuring the reliability of the wood roofing system.