Cladco Composite Structural Joist – 100mm x 50mm x 4m

£40.01 incl. VAT

Delivery Time: 5 to 10 Working Days



Ensuring that your project begins correctly is essential, and our structural composite joists can help you achieve that by providing a strong foundation for your deck boards or cladding to be placed correctly. Ideally placed onto a concrete base, these structural composite decking joists are made from recycled plastics and measure 4000mm x 100mm x 50mm.

The structural composite joists come in charcoal colour only. However, their colour does not need to match the rest of your installation as they will be installed within the foundations and can be hidden with Decking Boards and Fascia Boards.

Joist Specification

  • Joist Length: 4m
  • Joist Width: 100mm
  • Joist Thickness: 50mm
  • Joist Weight: 17.24kg

When building elevated decked areas, you need reliable support for your decking joists. Our structural composite joists are designed to provide just that, ensuring hard-wearing and long-lasting use for years to come.

If a solid concrete base isn’t an option, you can also place the structural composite joists directly onto the grass. To ensure maximum strength and reliability, we recommend purchasing one structural composite joist for every square meter of decking, with a maximum spacing of 400mm between each joist. For detailed installation instructions, please consult our installation guides.

Please note that Cladco Structural Joists require support every 1m for the structure of the joist itself. When installing composite decking onto structural joists, we advise 400mm centres. For PVC decking installations, we advise 300mm centres.

Standard Delivery Information

Delivery Costs: All delivery costs are given in the basket and during checkout after a delivery postcode is entered, this is because delivery costs are dependent on the products that you’re looking to purchase and where they need to be delivered to. Delivery costs are based on delivery to a single address within the UK Mainland, excluding the Scottish Highlands and Islands where additional costs may apply.

Delivery Times: An estimated delivery date will be given on the majority of product pages at the time of order. We aim to deliver on or around that date, but please keep in mind that it is only an estimate and accurate delivery information and updates will be provided after an order is processed by our team.

Delivery Updates: We will provide delivery updates to the contact information that you provide during checkout, many of these updates are automated so please ensure that the information provided is entered correctly, and be sure to check your junk/spam folder periodically. The level of delivery service and tracking that’s available is dependent on the products that are ordered, but please rest assured that we will always provide the best available level of service and updates.

During Delivery: All delivery costs are based on the customer being able to accept the goods, and on heavier items, this means having the ability and willingness to manually offload the goods, or have mechanical offloading facilities on site.

Delivery Access: Please let us know of any potential delivery or access issues as soon as possible, ideally by using the order notes section during checkout, we will then work with our delivery partners to ensure that an appropriate delivery service is planned (if available). Bulky and palletised items in particular will be delivered on a large vehicle, usually an 18t rigid lorry and if delivery fails due to us not being made aware of access issues or nobody being at the address to accept the delivery, then additional costs may apply.

Accepting Delivery: Please check your goods thoroughly before signing for them, and do not accept damaged goods. Orders signed for “unchecked” will be considered as being received in good condition. As soon as the order has been delivered as instructed, the goods become your property and the liability for product care, damage or loss passes to you.

Delivery Issues: If you experience an issue with your delivery, please get in touch and a member of our friendly team will be happy to help.

Additional information