4m Structural Composite 100x50mm Joist
Ideal for garden decking projects, Cladco 4m structural composite joists combine exceptional strength with a lightweight, hollow-core design. Their wide supporting surface ensures a stable and reliable base, making installation easier and enhancing the durability of your decking from the ground up.
More About Cladco 4m Structural Composite Joists
Starting your decking project on the right foot is essential, and Cladco’s 4m structural composite joists are designed to provide a sturdy yet lightweight framework for your composite decking boards. Best installed over a solid concrete base, these joists create a reliable, long-lasting foundation that supports your decking with strength and precision.
Manufactured from 60% recycled hardwood fibres and 40% recycled plastics, the charcoal-coloured joists measure 4000mm x 100mm x 50mm. As these joists are concealed within the substructure, they do not need to match the decking or trim colours. Any visible edges can be neatly covered using Cladco decking and fascia boards.
Joist Specifications
- Length: 4m
- Width: 100mm
- Thickness: 50mm
- Weight (Approx.): 17.24kg
Ideal for elevated decking areas, these structural composite joists can also be placed directly onto grass if a concrete base is not feasible. They are engineered for hard-wearing, long-lasting performance.
For optimal strength and stability, we recommend using one joist per square metre of decking, spaced at a maximum of 400mm centres. Proper support for the joist substructure is required approximately every 1 metre.
For detailed installation guidance, please consult our installation guides.
Looking for an alternative?
Browse our decking frame department for composite joists/battens and more.
*Cladco composite products are available as FSC® certified at no additional cost. Please specify if you require FSC® certification when placing your order.
From £43.20 inc VAT
Order A Sample Pack!
Click Here to view our installation guide.
Download the datasheet for 4m Structural Composite 100x50mm Joist
| 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.
