Aluminum Structural Joist 50mmW x 25mmH x 3000mm long

ENGINEERED ALUMINIUM JOISTS

Low Height • Super Strong • Perfect for Composite Decking

ENGINEERED FOR MODERN DECKING PROJECTS

Our engineered aluminium joists are specifically designed for low-height decking applications where traditional timber framing is not practical.

Manufactured from heavy-duty extruded aluminium, these joists provide a straight, stable and long-lasting sub-frame solution for both composite and timber decking systems.

Ideal for:

- Rooftop decks
- Alfresco areas
- Pool surrounds
- Balconies
- Concrete slab installations
- Waterproof membrane applications
- Floating deck systems
- Residential & commercial projects

JOIST SPECIFICATIONS

- 50mm wide x 25mm high
- 3000mm long lengths
- Engineered extruded aluminium profile
- Designed to generally be used at 400mm centres
- Ideal for low-height deck construction
- Stronger and more stable than timber in compact build situations
- Corrosion resistant and low maintenance

JOIST PRICING

The listed price is only available when purchasing Honorwood Composite Decking in the same order.

If purchased separately without our decking:

$55 per 3m length

LOW HEIGHT & FLOATING DECK SYSTEMS

These aluminium joists are ideal for low-level deck builds where drainage, moisture or limited height clearance prevents the use of traditional timber framing.

Using our adjustable deck pedestals, the system can easily level uneven surfaces and create a perfectly flat deck structure over:

- Concrete slabs
- Existing pavers
- Waterproof membranes
- Natural ground
- Existing deck areas

The system is designed to “float” over waterproof membranes without penetrating them, making it ideal for rooftop and balcony applications.

It is also an excellent solution for covering old or uneven pavers without expensive demolition work.

DIY INSTALLATION NOTES

For DIY installations, aluminium joists must still be properly supported throughout the span like any structural decking sub-frame.

Generally, support spacing should be approximately every 400mm.

Some customers have advised that 600mm centres have worked for their particular applications, however this depends on the decking product, loading and overall deck design.

As an example, a 3m joist would normally require approximately 6–8 support points underneath.

You cannot lay joists directly onto dirt or grass without proper supports underneath.

Most projects use a combination of:

- Adjustable deck pedestals
- Existing posts or piers
- Packers or levelling plates
- Concrete supports

Please also follow your decking manufacturer’s specifications, as different decking boards may require different joist spacing requirements.

RUBBER JOIST MEMBRANE

To help reduce potential tapping or movement noise between the deck boards and aluminium joists, we recommend using our rubber joist membrane tape between the joist and decking boards.

We also supply 9 different pedestal riser heights to help you perfectly level your deck structure.

BULKY GOODS DELIVERY

- If only buying small quantities, Australia-wide wrapping and shipping is approximately $12 to $28 per 3m joist depending on your location and order quantity.

- Please message us with your suburb, postcode and quantities required for a custom freight quote.

- Pedestals, joists and decking can all be combined together for freight savings.

HONORWOOD COMPOSITE DECKING SYSTEM

Pair these engineered aluminium joists with our premium Honorwood Composite Decking system for a complete low-maintenance decking solution.

Strong • Straight • Long Lasting • DIY Friendly