

Recycled Plastic Joist, 50mm x 125mm x 3m length, Black
Manufactured using 100% recycled plastics, these 50mm x 125mm joists are a high-quality, robust and durable product that is easy to handle during installation. Plastic joists will ensure your garden decking is well supported and structurally sound. Available in 3m lengths to fit specific decking subframe requirements.
Discover Our 100% Recycled 3m Plastic Joists
A sturdy base is crucial for any quality decking build. Properly installed, structurally sound, and secure joists are essential for long-lasting decking boards.
Our plastic joists are made from 100% recycled end-user plastics, for a robust and high-quality decking joist. These black joists can be installed underneath Nordeck, Millboard®, timber or composite decking boards.
Joist specifications
- Length: 3m
- Width: 125mm
- Height: 50mm
- Colour: black
To make these joists, the plastics are melted down, shaped into moulds and cooled to form strong and heavy-duty support battens. Not only do they offer eco-friendliness through recycling but also come with a 20-year warranty.
Other benefits include
- Greater strength compared to timber.
- Manufactured in the UK.
- Eco-friendly, lasting alternative to timber.
- Suitable for installation on grass, concrete, or uneven terrain.
- Compatible with multiple decking boards
- Resistant to splintering and rot.
- No need for varnish, treatment, or sanding
- Virtually maintenance-free.
- Simple to install, recycled plastic joists can be cut to custom sizes using traditional hand tools, ensuring a seamless fit for your decking project regardless of its shape or size.
Looking for a longer plastic post?
See our 3.6m recycled plastic joist, 50mm x 100mm
Looking for another size?
See our 3m recycled plastic joist, 100mm x 100mm
Or browse our recycled joist department for decking frames and more…
Order A Sample Pack!

Download the datasheet for Recycled Plastic Joist, 50mm x 125mm x 3m length, Black


Type | When? | Cost? | ||
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National Delivery | Orders under £1,000 | Est. 5 working days* Roofing items 7-10 working days* |
£192.00 |
Orders over £1,000 | Est. 5 working days* Roofing items 7-10 working days* |
£96.00 | ||
Orders over £1,500 | Est. 5 working days* Roofing items 7-10 working days* |
FREE | ||
Scotland Delivery | Postcodes: PA, PH, DD, AB, IV, & KW | Est. 15 working days* Roofing items 7-10 working days* |
£360.00 | |
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Millboard Delivery | Orders under £2,000 | Est. 5 working days* | £192.00 |
Orders over £2,000 | Est. 5 working days* | FREE | ||
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Parcelforce Standard | (Small Parcels) | 3-5 working days* | £8.50 |
Parcelforce Standard | (Large Parcels) | 3-5 working days* | £30.00 | |
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Sample Packs via Courier | 5 working days* | FREE |
*Please allow for public holidays and weekends (non-delivery days)
Some of our products are available for collection from our warehouses in Okehampton (Devon) and Andover (Hampshire) - This option will show at checkout, when available.
Standard collection lead time is 3-5 working days, this may vary depending on the product. If you would like to collect your order after 2 hours, please choose this option at checkout.
Please note that collections are only available from Monday-Friday, 08:00 - 17:00 & Saturday, 08:00 - 12:30 (Note: this IS the cut off time for collections, despite our closing time of 13:00)
Please Note The Following Prior To Collection:
Vehicles we can and cannot load
Cladco Profiles will only load flatbed lorries and flatbed trailers for insurance purposes. If the appropriate vehicle is not available, two people would be required for a collection.
Cladco Profiles will NOT load any vehicles with roof racks, horse boxes, cattle lorries or fixed-sided trailers. Cladco Profiles has the right to refuse loading a vehicle for any reason.
Before arranging a collection, please read our Customer Collection Notice below.

Our Okehampton HQ and Warehouses (Devon)

Our Andover Warehouses (Hampshire)








Customer Collection Notice
Please ensure you have pre-booked your collection slot before travelling to site.
When arriving to collect your order, please report to a member of our Warehouse Team who will register your arrival and locate your goods. Once ready, your items will be picked and brought to your vehicle loading area.
During busy periods, there may be a short wait while our yard team assist other customers or complete other loading tasks. We always do our best to work within your booked collection time.
We respectfully draw your attention to the following important points:
- Loading is ultimately the customer’s responsibility. While our team can assist with mechanical loading using forklifts, we cannot handball items into enclosed vehicles. Customers must ensure their vehicle is suitable and that goods are safely loaded and adequately secured before leaving the premises.
- Sharp sheeting, metal goods, and long/heavy items may pose additional handling risks. Please come prepared with high-quality protective gloves, and any appropriate protection materials to avoid damage to your vehicle or restraints (e.g. ropes or straps). The edges of roofing sheets and metal products can be extremely sharp, and care should be taken when handling.
- We strongly recommend that customers bring their own straps, ropes, or other securing materials, as we are unable to provide these at the point of collection.
- If you are unsure of your vehicle’s load capacity, we can advise the approximate weight of your order in advance. It is your responsibility to ensure your vehicle is suitable for transporting the goods safely and legally.
- Cladco will not be held liable for any damage to your vehicle or goods once they have been loaded and leave our premises. Loading assistance is provided entirely at the customer’s own risk.
Click & Collect – Pre-Booking Required
You are welcome to collect your order from either our Okehampton (Devon) or Andover (Hampshire) site. All collections must be pre-booked in advance so your items can be picked, packed and ready for you.
Please do not travel to site without a confirmed collection time, as we cannot guarantee your order will be available.
Once your items are ready, you will receive an email with a link to book your collection slot. Please note, same-day collections are not available and bookings must be made at least two hours in advance.
When you arrive, please bring your order confirmation and follow the signage to the collection area where a member of our team will assist you.