CR-21 Landscapes and Irrigation Practice Test 2026 – Comprehensive Exam Prep

Expansion joints are designed to absorb movement in pavement and keep water and debris out. The width of cracks that can still be effectively sealed is limited, so the joint remains functional. The maximum allowable crack width is three-eighths of an inch. Cracks that large or wider mean the sealant and filler may fail, letting water infiltrate and causing more damage, so the joint should be repaired or resealed. Smaller cracks, like one-sixteenth or one-quarter inch, are within the tolerance and typically still acceptable, while a half-inch crack would exceed the limit and compromise the joint’s performance.