Composite Decking Joists

Specially designed to support modern composite decking systems, Composite Decking Joists from Tough Decking are best when used on flat roofs or level concrete or compacted substrates.

Unlike traditional timber subframes, composite joists are resistant to rot and moisture damage.

This makes them a better choice than wood in terms of longevity and risk of maintenance in the future.

Tough Decking Composite Decking Joists can be installed quickly and efficiently by either screwing directly into position using decking screws or by haunching into cement where required. Once installed, the composite decking boards can be fitted directly on top to create a clean, modern, and future-proof decking installation suitable for both residential and commercial applications.

For optimal performance and longevity, composite decking joists should always be laid on a solid, level sub-base with a slight fall or gradient to encourage effective water drainage and prevent standing water.

Why Choose Composite Decking Joists?

Composite decking joists offer a practical alternative to traditional timber framing, combining strength, durability, and ease of maintenance in one reliable solution. Whether you are constructing a garden deck, patio extension, commercial outdoor seating area, or leisure space, composite joists help provide the structural support needed for a long-lasting decking system.

Key Benefits Include:

• Strong and durable composite construction
• Designed specifically for composite decking systems
• Low-maintenance and easy to clean
• Resistant to rot, moisture, splintering, and warping
• Excellent weather resistance for year-round outdoor use
• Expansion and contraction properties closely matched to composite decking boards
• Quick and straightforward installation process
• Creates a neat, professional, and long-lasting decking finish
• Suitable for both residential and commercial decking projects
• Ideal for gardens, patios, balconies, holiday parks, pubs, restaurants, and outdoor seating areas

Installation Guidance

To achieve the best possible results, always ensure your joists are installed on a stable, level foundation with adequate support and spacing. Correct spacing between joists is essential for maintaining structural integrity and ensuring your composite decking boards perform as intended.

Proper drainage should also be considered during installation to help maximise the lifespan of the decking system and maintain a safe, slip-resistant surface.

Need Help or Advice?

If you have any questions about installation, joist spacing, load requirements, or suitability for your project, our experienced team is here to help.

We are always happy to provide friendly, expert advice completely free of charge to help you choose the right composite decking products for your project.