What is a control joint's typical requirement regarding the area of panel sizes?

The typical requirement for a control joint is to limit the area of panel sizes to 144 square feet. Control joints are used in concrete and masonry to help control cracking caused by temperature changes and shrinkage. By establishing a specific size for the panels, the likelihood of cracking can be minimized as the joints create a predetermined place for cracks to occur rather than allowing them to form arbitrarily across large areas.

The limit of 144 square feet is based on general industry standards and practices that aim to provide the best balance between aesthetic appeal and structural integrity. This guideline helps ensure that the expansion and contraction resulting from temperature fluctuations can be effectively managed, reducing the risk of excessive cracking that could compromise the durability and appearance of the surface.