Description

Plastic Decking Clips

Plastic decking clips are small but essential component used in modern decking systems. Used to secure composite decking boards neatly and efficiently. Designed to create a uniform 5mm gap between each board, these clips ensure consistent spacing that promotes proper drainage, ventilation and expansion.

The key factors in maintaining the longevity and stability of outdoor decking structures. Made from durable reinforced polymer materials they are resistant to corrosion, rot and moisture, making them particularly suitable for composite or timber installations exposed to the elements.

The primary advantage of 5mm plastic clips is their ability to deliver a clean, professional finish. Unlike traditional screws or nails, which are visible and can damage the board surface over time. These hidden fasteners sit discreetly between boards, preserving the decks smooth aesthetic.

Installation is straight forward; clips are positioned along the joist and the deck boards are fitted over them, with the clips locking into the grooves of adjacent boards. This system not only speeds up installation but also allows for easy board removal and replacement if needed.

Each pack of our plastic clips contains 100 clips and 100 black square head screws. Every plastic clip order also comes with at least one square head drill bit included.

Working out joist spacing 

Joists are usually spaced 400mm (0.4m) apart (centre to centre)

3.6m boards

3.6 / 0.4 = 9 gaps between joists – 10 joists total

4.8m boards

4.8 / 0.4 = 12 gaps between joists – 13 joists total

Clips per joist

Each joist intersection between two boards typically uses one clip per board edge, so if you’re installing multiple boards side by side, each shared joists line will have one clip between them.

That means:

• For a single board edge (say the starter side) you’ll use one clip per joist.
• For a shared joist (between two boards) one clip secures both boards.

Approximate clips per board

Assuming you’re doing a full width deck (multiple boards) and you count clips per board run:

• 3.6m board: about 10 clips per board
• 4.8m board: about 13 clips per board
• if you’re including starter clips add one per end of the first and last board