What requirement must be fulfilled when walls run parallel to the floor joists?

When walls run parallel to the floor joists, it is crucial to recognize the structural implications involved. In this scenario, both doubled joists and laddered joists serve important roles in maintaining the integrity of the floor system.

Doubled joists are used to provide additional support where walls intersect with floor joists, ensuring that there is enough load-bearing capability to support the weight above the wall. This method enhances the strength of the floor system and helps distribute the weight more evenly across the structure.

On the other hand, laddered joists, which involve a structural configuration that increases the joists' rigidity and strength, also accommodate parallel walls effectively. The design creates a network that helps to support load and maintain floor stability.

Thus, selecting either doubled joists or laddered joists meets the requirements for these specific wall placements. This dual option ensures that builders can choose the method that best fits their particular building design while still adhering to structural integrity and safety standards.