What is the purpose of expansion joints in brick cladding?

The purpose of expansion joints in brick cladding is fundamentally to manage the movements caused by temperature fluctuations. When materials like brick expand and contract due to heat or cold, they can generate stress within the structure if there isn't adequate provision for that movement. Expansion joints provide a flexible connection that allows for this movement, thereby preventing cracking and potential damage to the cladding.

The correct choice indicates a fundamental understanding of structural engineering and material behavior under thermal stress. While aesthetic appeal and structural integrity are important in construction, they are not the primary function served by expansion joints. In fact, neglecting to include expansion joints can lead to significant issues, including premature failure of the cladding system.

In summary, the role of expansion joints is critical for the longevity and durability of brick cladding, ensuring that temperature-induced movements do not compromise the integrity of the structure.