What is a primary function of an expansion joint?

The primary function of an expansion joint is to allow for thermal expansion and contraction. As materials such as concrete and tile absorb heat, they expand; conversely, when temperatures drop, these materials contract. Without expansion joints, the inevitable movement due to thermal changes can lead to cracking, buckling, or other structural damage.

Expansion joints accommodate this movement by providing a designed gap or a flexible element within the structure, which allows for the necessary space to prevent stress concentrations that could lead to failure. This is particularly critical in large concrete slabs and tiled surfaces, where uniformity and integrity must be maintained despite fluctuations in temperature. Therefore, understanding the role of expansion joints is essential for ensuring the longevity and performance of tiling systems and other structures.