North Carolina Building Contractor License Practice Exam

What is the required thickness for nails connecting laminations in decking?

1. 1 inch

2. 1 1/4 inch

3. 1 1/2 inch

4. 1 3/4 inch

The correct answer is: 1 1/2 inch

The requirement for the thickness of nails connecting laminations in decking is grounded in structural integrity and safety. For laminations in decking, a nail thickness of 1 1/2 inch is appropriate because it provides sufficient penetration into the material to create a strong bond without compromising the structural qualities of the decking. Nails that are 1 1/2 inch long effectively penetrate the underlying layers of material, ensuring that the laminations are securely fastened together and can withstand the stresses they will encounter over time. This length also allows for adequate holding power, reducing the risk of the nails pulling out or shearing under load. In application, the choice of nail thickness must balance penetration with the risk of splitting the material. A nail of 1 1/2 inch strikes this balance well for most standard decking applications. Understanding why this specific thickness is critical helps in ensuring compliance with building codes and creating safe structures.