Which construction technique improves the structural integrity of a framework?

Doubling joists under load is a technique that significantly enhances the structural integrity of a framework. When joists are doubled, it effectively increases the load-bearing capacity of the floor or ceiling system. This method distributes weight more evenly and minimizes the risk of deflection or failure under heavy loads or stress. By providing extra support where it's needed most, doubling joists can accommodate more weight, which is especially important in residential construction where floors may support heavy appliances, furniture, and human activity.

Using lighter materials or reducing the number of trimmers may seem beneficial for reducing construction costs or making the project easier to manage, but these approaches do not inherently improve structural integrity. Instead, they could lead to a weaker framework if not properly considered. Additionally, using smaller headers can negatively impact structural support, particularly in load-bearing situations. Therefore, doubling joists under load remains the correct choice for enhancing the strength and stability of a building's structure.