
4m Aluminium Decking Joist 50mm x 50mm
Cladco 4m aluminium joists are designed to create a supportive substructure for aluminium decking installations. These aluminium joists are powder-coated and reinforce the structure of aluminium decking projects whilst being ultra-lightweight with superior strength when compared to timber or composite joists.
Begin Your Aluminium Decking Project With Our Aluminium Joists
Creating the supportive foundation for your aluminium decking boards is vital to ensure a high-quality finished product. Cladco aluminium joists will enable you to correctly install your decking boards upon a secure and supportive substructure.
These Joists can also be installed as a supportive substructure for timber and composite decking installations as well as aluminium boards.
Joists specifications
Length: 4m
Width: 50mm
Thickness: 50mm
Weight: 4.04kg approx.
Colour: Black
Material: Non-corrosive powder-coated aluminium
Manufactured from high-quality powder-coated aluminium, these joists are 4m in length and are available in black only. Due to the joists being concealed beneath the decking boards, they have no need to be colour-matched to the boards themselves.
These joists have an A2 fire rating alongside an S1 non-combustible rating and so can be installed in living spaces that are more than 18m high. Before carrying out any installation, ensure you have checked all information with your building regulator and contractor prior to purchase.
Looking for a skirting trim?
See our 2.2m aluminium skirting trim
Looking for a corner trim?
See our 2.2m aluminium corner trim
Or browse our aluminium decking department for decking boards and more…
Order A Sample Pack!

Download our printable installation guide.
Download the datasheet for 4m Aluminium Decking Joist 50mm x 50mm
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.