Patio slabs that rock underfoot are a bedding or drainage problem, and they won't fix themselves. Plex Group explains why it happens and what a proper repair looks like across Worcestershire and Gloucestershire.
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The most reliable method for bedding paving slabs is a full mortar bed — mortar covering the entire underside of the slab, with no voids. A cheaper and faster alternative is to spot-bed: placing five blobs of mortar at the corners and centre. Spot-bedded slabs are structurally inferior from day one, particularly on clay ground. Any unevenness in the sub-base beneath creates a pivot point, and the slab rocks immediately or begins rocking within a season or two.
If your patio has open joints or cracked jointing compound, water enters the gaps and washes out the sand or mortar beneath each slab over time. Once the bedding is uneven or absent in places, the slab loses its stable platform. The heavier the slab, the more dramatically it rocks. This process accelerates in winter when frost also disrupts the bedding from below.
Even correctly bedded slabs can begin to rock if the sub-base beneath them moves. In Worcestershire and Gloucestershire, clay soils contract in dry summers and expand in wet winters. If the sub-base layer isn't thick enough to buffer this movement, it transmits directly to the bedding layer and then to the slab. Slabs in corners and along edges are often the first to be affected.
Roots growing beneath a patio create uneven upward pressure. They lift one side of a slab while leaving the other side at its original level, producing an obvious rocking motion. In established gardens across the Cotswolds and Vale of Evesham, root intrusion is a common cause of rocking slabs that returns quickly even after re-bedding.

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Plex Group inspects and repairs rocking patio slabs across Worcestershire, Gloucestershire, Oxfordshire, and Warwickshire. In most cases we can identify the problem in a single site visit — distinguishing between localised bedding failure, drainage problems, and more widespread sub-base issues. We'll tell you honestly what the repair involves and whether a full relay is necessary. Get in touch to arrange an assessment.

Rocking slabs are a symptom of a bedding or drainage problem, not just wear and tear. Plex Group diagnoses and fixes patio slab movement across Worcestershire, Gloucestershire, and Warwickshire.
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Patio slabs that rock underfoot are a bedding or drainage problem, and they won't fix themselves. Plex Group explains why it happens and what a proper repair looks like across Worcestershire and Gloucestershire.
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