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Use our decking calculator to work out the size and quantity you'll need
Making sure you begin your project in the right way is crucial, and our structural composite joists will do exactly that, enabling you to place your deck boards or cladding in the right way. Ideally placed onto a concrete base underneath, these structural composite decking joists will ensure that everything is correctly positioned and crucially give a strong foundation for your project.
Produced from recycled plastics and measuring 4000mm x 100mm x 50mm, the structural composite joists are available in charcoal colour only as they will lay the foundations for the rest of your composite deck boards to be fitted on top.
Joist Length: 4m
Joist Width: 100mm
Used for elevated decked areas, you can also place structural composite joists directly onto grass if a solid concrete base isn’t an option. These are designed to ensure hard-wearing and long-lasting use for many years.
We recommend purchasing for every square metre of decking 1 structural composite joist and they should be spaced no more than 400m apart at a maximum so that your base is as strong and reliable as possible. For more on how to install correctly, consult our installation guides.