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 | 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
For those customers wishing to collect materials, we ask you report to the office first in order to be seen by a member of the sales team. Your goods will then be picked and brought to your vehicle.
Please note that during busy periods you may experience a wait while our yard staff serve other customers or are loading/unloading other vehicles.
We respectfully draw your attention to the following points:
- It is the ultimately the responsibility of the customer to load his/her vehicle and to ensure the goods are safely/ securely strapped down.
- Our staff will be happy to assist you load your goods onto appropriate vehicles by way of fork lift trucks. Our staff will not handball any goods into enclose vehicles. The loading of the vehicle is carried out entirely at the customers own risk. We will not be held liable for any damage that may occur to your vehicle or goods collected from our premises during the transport of said goods.
- It is the responsibility of the customer to ensure both their vehicle and the goods are safe when they leave our premises.
- We can advise the approximate weight of materials prior to you arriving so that you can be sure your vehicle is capable of carrying the intended load. Please ensure that you bring appropriate ropes, straps or other securing materials as we are unable to provide you with any upon arrival.
- We strongly recommend you bring suitable protection materials to prevent your ropes/straps etc. be damaged by these edges. We recommend that you use good quality protective gloves when handling materials.
