Aluminum Structural Joist 50mmW x 70mmH x 4000mm long
- Availability: In Stock
- Brand: Honorwood
- Product Code: 50x70mm aluminium joist
ENGINEERED ALUMINIUM JOISTS
Super Strong • Perfect for Composite Decking
ENGINEERED FOR MODERN DECKING PROJECTS
Our engineered aluminium joists are specifically designed for 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 70mm high
- 4000mm long lengths
- Engineered extruded aluminium profile
- Designed to generally be used at 1100mm centres
- 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:
$75 per 4m length
FLOATING DECK SYSTEMS
These aluminium joists are ideal for 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 1100mm.
As an example, a 4m joist would normally require approximately 5 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 4m 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
