How far apart should expansion joints be placed in concrete sidewalks?

The appropriate distance for placing expansion joints in concrete sidewalks is at intervals of 30 feet or less. Expansion joints serve a critical purpose in allowing for the natural expansion and contraction of concrete caused by temperature changes.

Since concrete expands when heated and contracts when cooled, properly placed expansion joints reduce the risk of cracks forming in the concrete. By specifying a distance of 30 feet or less, it ensures that the concrete has adequate spacing to accommodate these movements without leading to structural issues. This distance helps maintain the integrity and longevity of the sidewalk, as well as provides a smooth surface for pedestrians.

In practice, the specific placement of expansion joints can depend on various factors, including the environmental conditions of the area and the width of the sidewalk. However, adhering to the guideline of 30 feet or less is essential for effective control of expansion and contraction in most situations.