National Occupational Competency Testing Institute (NOCTI) Carpentry Practice Exam

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What is the primary function of the rim board in carpentry?

Support for floor joists
Subflooring material
Decoration of the structure
Waterproofing

The correct answer is: Support for floor joists

The primary function of the rim board in carpentry is to provide support for the floor joists. Rim boards are crucial components of the structural framework of a building, as they help create a stable edge for the floor system. They are typically installed at the ends of the floor joists and serve to reinforce the ends while also tying the floor system together. This allows for a balanced load distribution across all joists and helps enhance the overall integrity of the flooring structure. Additionally, rim boards can contribute to the prevention of potential movement in the joists, which further enhances stability and reduces the risk of squeaking or shifting over time. Their role in supporting and connecting the floor joists is fundamental to ensuring the safety and durability of the structure, explaining why this option is the primary function of the rim board in carpentry.