A retaining edge (Dutch: borgrand) is a border element installed along the perimeter of a paved surface to prevent the lateral displacement of tiles, pavers, or cobblestones. Without this edge restraint, horizontal forces from traffic and thermal expansion would gradually push pavers outward, causing the surface to spread, shift, and ultimately fail.
Retaining edges are a fundamental but often overlooked component of any interlocking paver or tile installation, whether it is a garden path, driveway, patio, or public plaza.
Application
Retaining edges are used wherever segmental paving requires lateral confinement:
- Driveways and parking areas: Heavy vehicle loads generate significant horizontal thrust; robust concrete or steel retaining edges keep pavers locked in place.
- Garden paths and patios: Lighter-duty aluminium or plastic edge profiles are sufficient for pedestrian-only surfaces.
- Interior floor tiling: In large-format tile floors without grouted perimeters, retaining edges within expansion joints prevent tile creep.
- Permeable paving systems: Special retaining edges with drainage slots allow water to pass through while still providing lateral support.
- Raised terrace decking: Edge profiles double as a finishing strip, concealing the cut edges of deck tiles or pavers.
Retaining edges come in various materials depending on the application and required strength: concrete kerbs, galvanised steel strips, aluminium profiles, recycled plastic borders, and natural stone edging. They are typically set on a concrete haunch or secured with steel ground stakes driven into the sub-base. The top of the retaining edge may sit flush with the paving surface (hidden edge) or project slightly above it (visible border), depending on the design intent and drainage requirements.
Related terms
- Kerb
- Edge restraint
- Paving border
- Expansion joint
- Interlocking pavers
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