Aluminium Metal Joists – Black powder-coated


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Black powder-coated aluminium joists for decking sub structures

Aluminium Metal Joists - Black powder-coated


The aluminium black powder-coated joists are ideal for a more discreet look, below your decking surface. The joists are the ultimate decking patio support solution, when installing a composite decking area. This strong support system is also A1/A2 fire rated. Using the aluminium metal joists substructure allows you to create a sturdy base for your project that will not need replacing over time, unlike a traditional wooden frame, which would eventually rot. Quickly becoming the go to substructure in the industry. Widths of all joists is 48mm, choice available is for the 3 heights only.

Joist support spans.

25mm joist - 400mm
50mm joist - 600mm
75mm joist - 1000mm
*This is not a 100% requirement for the composite decking Also available in un-coated aluminium here.

Available in three heights. All with a width of 48mm and length of 3.6m

Lengths are all 3600mm (3.6m)

  • 25mm depth – suitable for joist support spans f0r 400mm
  • 50mm depth – suitable for joist support spans f0r 600mm
  • 75mm depth – suitable for joist support spans f0r 1000mm

Is it only available in Black powder-coated?

No you can also purchase the joists in regular un-coated aluminium here.

Do you only offer these 3 lengths?

Yes we only supply the three sizes listed below, all are 3.6m in length.

22mm depth

38mm depth

72mm depth

Do I have to use aluminium for my decking sub-structure (framework)?

No you do not have to use the aluminium, you can choose to use a regular wooden framework below. We do not supply this other option, but your installer will be able to easily source this for you.

Delivery 3-5 working days

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