C24 Sawn Green Treated Timber Decking Joist 47mm x 100mm – 4.2m & 4.8m Available

High-Quality Timber Decking Joists for Durable Deck Foundations

Create a strong and lasting base for your outdoor timber or composite decking with premium timber decking joists, precision-cut to 47mm x 150mm. These FSC-certified joists are pressure-treated with Tanalith E for exceptional resistance to decay, making them ideal for year-round outdoor use.

Why Use Timber Decking Joists for Your Decking Base?

Choosing the right timber decking joists is essential for building a safe and stable decking structure. These structural components provide critical support when installed beneath decking boards. When used with treated timber posts, they form a solid framework capable of withstanding long-term outdoor conditions.

Timber Decking Joists Specifications:

• Lengths Available: 4.2m and 4.8m

• Width: 150mm

• Depth: 47mm

• Weight: Approx. 14.94kg (4.2m), 17.07kg (4.8m)

• Treatment: High-pressure green treated with Tanalith E

• Grade: C24 ideal for structural use

• Certification: FSC certified for sustainability

These treated timber decking joists offer high strength and resistance to environmental elements, making them a reliable choice for any decking framework.

Building a Strong Deck with Timber Decking Joists

Available in two standard lengths, these decking joists are suitable for various garden and patio decking projects. The 150mm wide design offers more support compared to narrower alternatives, helping to ensure long-term performance and structural integrity.

To achieve the best results, it is recommended to install timber decking joists on a solid concrete base. This ensures even weight distribution and reduces the risk of movement over time. Installation is straightforward with available guides, trims, and fixings to support a smooth and efficient build.

C24 vs. C16 Timber Joists: What’s the Difference?

Understanding timber grading is crucial when selecting decking joists.

• C16 timber decking joists are sourced from fast-grown softwood, resulting in more knots and less strength.

• C24 timber decking joists, on the other hand, are cut from slower-grown trees, offering denser, stronger, and more durable timber ideal for structural applications.

C24 is typically up to 50% stronger than C16, making it the preferred choice for decking frames that demand superior load-bearing performance.