H&S Carpentry Practice Test 2025 - Free Carpentry Exam Practice Questions and Study Guide

Joists play a crucial role in construction, primarily serving as horizontal structural members that support and distribute loads for flooring systems. They are typically made of wood or metal and are installed parallel to each other to provide a stable framework for floor structures. This arrangement not only supports the weight of the flooring materials and any loads applied on it, such as furniture and occupants, but it also helps to evenly distribute these loads to the walls and foundation below.

In addition, joists contribute to the overall rigidity and stability of the floor system, which is essential for ensuring safety and comfort within a building. Their design allows for some flexibility, which can help reduce the risk of cracking or damage to the flooring materials over time due to shifting loads.

While some options mention connecting walls to foundations or supporting roofing materials, these functions are not the primary purpose of joists. Joists focus specifically on the flooring support and load distribution, making them essential for the structural integrity of the floors in buildings.