If expansion joints are not provided in long masonry runs, what is the most likely consequence?

• A. Reduced construction time.
• B. No impact on performance.
• C. Cracking due to thermal expansion and contraction.
• D. Improved insulation.

Answer: (C)

Long masonry runs must be able to absorb movement from temperature changes and other effects. When the wall is built as a single, restrained piece, it can’t flex or slide as bricks and mortar expand and contract with heat and moisture. Masonry handles compression well but is weak in tension, so the restrained movement creates tensile stresses within the units and joints. Those stresses lead to cracks—often developing along mortar joints or through bricks—over time, especially in long runs where movement is greatest. This is why expansion joints are placed to relieve that movement and prevent cracking. The other options don’t fit because expansion joints don’t speed up construction, don’t improve insulation, and their absence doesn’t leave performance unchanged; it typically results in cracking and potential damage from the restrained movement.