Horizontal gap or separation A horizontal gap or separation is an opening between adjacent sidewalk slabs or pavement sections without a significant difference in height. The space may widen as the pavement moves over time.
Gaps can develop because of shrinkage, settlement, erosion, or movement caused by changing temperatures. Although some joints are intentionally constructed, unusually wide separations may allow water infiltration, collect debris, or contribute to pavement deterioration. Repairs depend on the cause and the condition of the surrounding concrete.
Frequently Asked Questions About Horizontal gap or separation
What is a horizontal gap in a sidewalk?
An opening between adjacent slabs without a significant height difference, which can widen as the pavement moves.
What causes gaps to open?
Concrete shrinkage, settlement, soil erosion beneath the slabs, and seasonal thermal movement.
Are all gaps defects?
No. Joints are intentional. The concern is unusually wide separations that let water in, collect debris and accelerate deterioration.
How are they repaired?
Minor gaps may be cleaned and sealed. Wide separations tied to settlement usually require addressing the base and replacing the affected flags.