What is NOT required in exterior nonbearing walls?

In the context of building construction, exterior nonbearing walls serve to enclose a structure and provide protection from the elements rather than to support the weight of the building above. Therefore, the inclusion of load-bearing headers is not a requirement for these types of walls. Load-bearing headers are necessary when the wall is supporting structural loads, allowing for openings like doors and windows. However, for nonbearing walls, such structural reinforcements are unnecessary, as these walls do not carry load from above.

Moisture barriers, insulation, and sheathing are critical components in nonbearing exterior walls. Moisture barriers prevent water infiltration, which is essential to maintain the integrity of the building envelope. Insulation is important for energy efficiency, helping to regulate indoor temperatures and improve comfort. Sheathing provides structural support and enhances the wall’s resistance to wind and other forces. Therefore, the absence of load-bearing headers stands out since they have no role in the structural integrity of nonbearing walls.