50mm x 50mm Black Composite Decking Joist – 2.4m Image

50mm x 50mm Black Composite Decking Joist – 2.4m

SKU: DECKJOIST-50

Brand: Dex

Durable Structural Support: Provides a strong and stable base for decking installations.
Made from Recycled Plastics: Eco-friendly construction reduces environmental impact.
Weather & Rot Resistant: Will not rot, warp, or splinter, ensuring long-lasting performance.
Low Maintenance: No need for painting, treating, or sealing — ideal for hassle-free decking.
Lightweight & Easy to Handle: Weighs just 5.1kg, making installation quick and efficient.

Description

50mm x 50mm Black Composite Decking Joist – 2.4m

Durable, Eco-Friendly Subframe Support for Composite Decking

Our 50mm x 50mm Solid Composite Decking Joist provides the strong, reliable foundation every decking project needs. Acting as the essential subframe between the ground and your decking boards, these composite joists ensure lasting stability and professional-grade structural support for both residential and commercial installations.

Manufactured from high-quality recycled plastics, these joists share all the same durable, low-maintenance properties as our Triton Composite Decking range — offering long-term resistance against rot, splintering, and warping, even in challenging outdoor conditions.

✅ Key Features

Robust Structural Support – Provides a solid, stable base for decking installations.
Durable Recycled Construction – Made from tough, eco-friendly recycled plastics designed to last.
Resistant to Rot and Warping – Maintains strength and shape even in wet or humid environments.
Low Maintenance – No painting, sealing, or treating required.
Eco-Friendly Material – Manufactured using sustainable, recycled materials for a greener build.

📏 Product Specifications

Size: 50mm x 50mm
Length: 2.4m
Colour: Black
Material: Solid composite (recycled plastic)
Weight: 5.1kg

Create a secure, long-lasting substructure for your composite decking with the Black Composite Decking Joist — a reliable, low-maintenance, and environmentally friendly solution built to perform and protect for years to come.

Technical Information

Delivery: 1-2 Working Days
Lead Time: Into Order 3-5 Days
Size: 50mm x 50mm x 2.4m
Colour: Black
Guarantee: 10 Years Manufacturers
Material: WPC

Delivery & Returns

Delivery

The despatch timings we publish are estimates and due consideration needs to be made when making purchases with tight deadlines and as such we shall not be liable for any losses, costs, damages, charges, or expenses caused by any delay for delivery of the goods.

Returns Policy For Brissco Online

We appreciate that there may be occasions you may wish to return items. To help you with this process please see our returns policy below.

Returning an item – Damaged

In the event you receive damaged goods we will arrange a replacement item for you. However, it is your responsibility to notify us within 72 hours of receipt that an item has been received damaged (please see risk below).

Returning an item – Risk

On receipt of the delivery you the customer, are responsible for those goods and any loss or damage to the goods shall be at your own risk.

Returning an item – Incorrect

If you receive incorrect goods it is your responsibility to notify us within 72 hours of receipt at which point we will make the necessary arrangements.

Delivery shortages

Firstly, our carrier delivers parcels/packages. Any shortages of them must be reported to the driver on receipt. Secondly, shortages of contents of the parcel(s)/package(s) against the enclosed Brissco advice note must be made within 72 hours.

PDFs

Decking Brochure

FAQs

1. What is the purpose of a composite decking joist?

The 50mm x 50mm Composite Decking Joist acts as the structural foundation for your decking system. It sits between the ground and the decking boards, providing essential support, stability, and alignment for a safe and long-lasting deck.

2. What is this joist made from?

It’s made from recycled plastics, offering an eco-friendly, sustainable alternative to traditional timber. The solid composite construction ensures strength and durability, even in challenging weather conditions.

3. What are the dimensions and weight of the joist?

Each joist measures 50mm x 50mm and is 2.4m long, with an approximate weight of 5.1kg — making it solid, sturdy, and easy to handle during installation.

4. Can this joist be used as part of the Triton Decking system?

Yes. These joists are fully compatible with Triton WPC Composite Decking and share the same high-quality recycled composite material for consistent performance and appearance.

5. What are the advantages of composite joists over timber joists?

Unlike timber, composite joists are:

Rot-resistant and moisture-proof
Splinter-free and warp-resistant
Insect and pest-resistant
Low-maintenance, with no need for staining, sealing, or painting
Long-lasting, providing a stable base for years

6. Is this joist suitable for all types of decking installations?

Yes — it’s ideal for use on solid, level bases such as patios, concrete, or compacted ground. However, for raised or uneven installations, a heavier-duty subframe system or pedestal support may be required.

7. How do I install composite decking joists?

Lay the joists evenly spaced across the base (typically 300–400mm apart, centre-to-centre).
Fix securely in place using suitable outdoor fixings.
Ensure proper drainage and ventilation beneath the deck to prevent moisture buildup.

8. Does the joist require maintenance?

No. The composite material is virtually maintenance-free. It won’t rot, crack, or warp — simply rinse occasionally to remove dirt or debris if exposed.

9. Is it environmentally friendly?

Yes — the joists are made from recycled materials, reducing waste and offering an environmentally responsible choice for decking foundations.

10. What are the key benefits of this 50mm x 50mm Composite Joist?