Decking that flexes or bounces when walked on

Bouncy Decking and Soft Spots Underfoot

Bounce is a structural signal. A deck should feel solid; noticeable deflection means the boards are spanning too far, the joists are undersized, or a support has moved.

It is worth taking seriously, especially on raised decks.

Composite Decking and Fencing work by Gardenscape in Essex

Joist spacing and board span

Every board has a maximum span between joists, and composite boards typically require closer centres than timber — often noticeably closer for boards laid diagonally.

Decks built to timber spacing and later re-boarded in composite are a common source of flex.

Supports and bearers

Posts sitting directly on soil settle and rot. Bearers spanning too far between posts sag in the middle. Both show as bounce that gets worse toward the centre of the deck.

Noggins between joists add considerable stiffness and are often missing.

Reinforcement versus rebuild

Adding intermediate joists, noggins and extra supports can transform a deck that is otherwise sound.

Where posts have rotted or the frame is undersized throughout, a rebuild on properly founded supports is the safe route — particularly on anything raised.

Frequently asked questions

Is a bouncy deck dangerous?

It can be, especially raised decks with balustrades relying on the same frame. It should be inspected.

Can joists be added without lifting all the boards?

Sometimes from below on a raised deck; on a low deck the boards usually need lifting.

What spacing do composite boards need?

It varies by product — always to the manufacturer's specification, which is tighter than typical timber practice.

Deck moving underfoot?

We assess the structure and reinforce or rebuild as needed.

Arrange an inspection Call 07535 661664