Bouncy decking means the subframe below the boards is underbuilt, failing or rotten. Plex Group explains the causes and what a proper repair looks like across Worcestershire and the Cotswolds.
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Standard softwood decking boards need joists at 400mm centres at most, and 300mm centres where boards run diagonally or where composite boards are used. Many decks are built with joists at 600mm centres, the spacing the builder had in their head from stud walls. The boards then span further than they were designed to and deflect underfoot. Undersized joist timber causes the same problem over longer spans. The fix is not more screws through the boards. The fix is more support underneath them.
The whole deck sits on its posts, and the posts are the part you cannot see. Posts concreted in without ground contact rated timber rot at the point where they leave the soil, usually within eight to twelve years. Posts sat on paving slabs or bare soil sink unevenly, and spiked repair supports driven in beside a failing post rarely hold because they never reach undisturbed ground. When one post drops even ten millimetres, the beam above it hangs unsupported and the whole corner of the deck bounces. If the movement is worse in one area than another, failed support below ground is the most likely cause.
Joists need bridging, known as noggins, fixed between them to stop them twisting and to share load across the frame. A frame without noggins works as a set of individual planks rather than a single structure, so every footstep loads one joist at a time. The same applies to the main bearers. Where a single beam has been stretched between posts set too far apart, the beam itself flexes and the deck moves as one surface.
Ground conditions across our area work against deck frames in different ways. In the Vale of Evesham and on the clay soils around Cheltenham, the ground swells in winter and shrinks in summer, which rocks concrete pads and loosens post fixings year after year. On the limestone brash of the Cotswold wolds the soil drains freely but is often shallow, so pads bear at inconsistent depths and settle unevenly. In older gardens around Broadway and Winchcombe, established tree roots lift and tilt pads long after the deck was built. Add a frame built tight to the ground with no airflow beneath it and the joists stay damp, soften and lose their stiffness long before the boards on top show any sign of trouble.

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We start with a full site assessment. That means lifting boards to inspect the joists, checking joist centres and spans against the board type, probing posts at ground level for rot and checking pads and footings for settlement. Where the frame is sound but underbuilt, we add joists to close the centres to 400mm, fit noggins throughout and sister weak joists with new C24 timber. Where posts have failed, we excavate and set new ground contact rated posts in concrete to a proper depth, never spiked repair supports. Where rot has taken hold, we rebuild the subframe on a ventilated design with a membrane over the joists before the boards go back down. Plex Group repairs and rebuilds decking across Worcestershire, Gloucestershire, Oxfordshire, and Warwickshire.

A bouncy deck is always fixable once the cause is identified. Plex Group assesses and repairs decking across Worcestershire, Gloucestershire, and the Cotswolds. Get in touch to arrange a site assessment.
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Bouncy decking means the subframe below the boards is underbuilt, failing or rotten. Plex Group explains the causes and what a proper repair looks like across Worcestershire and the Cotswolds.
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