SmartJoist
SmartJoist Engineered Timber I-Joists
SmartJoist is an engineered timber I-joist built for long, light, stable floor and roof framing. The I-profile gives you high load capacity at a fraction of the weight of solid timber, so longer spans go in faster with less labour and fewer intermediate supports. We stock SmartJoist H2S in depths from 200mm to 360mm, with flange widths from 40mm to 90mm, covering everything from standard residential floors to wide-span roof systems.
Why an I-Joist
The shape does the work. Concentrating the timber in top and bottom flanges with a web between them puts the strength where the load is, which is why an I-joist carries further than solid timber of the same weight and runs dead straight across the span. That means flatter floors with less bounce, fewer squeaks, and a frame that does not move on you after lock-up. Consistent depth and grading also speeds the floor system in, with less packing and waste.
The H2S treatment protects against termites for joists kept dry inside the building envelope, the standard for structural floor and roof framing in termite-prone Sydney areas. Match the depth to your span and the flange width to your load: deeper sections like 300 and 360mm for the longer runs, narrower flanges where the load is lighter.
What Goes With It
A joist system needs the right hangers and the right deck. Joist hangers and framing connectors sized for I-joists are stocked here, with the structural screws and bolts to fix them. Sheet the floor with structural flooring plywood, and where the same frame carries a beam or bearer, run LVL E13 H2 beams. See the full LVL and engineered timber range for every member on the job.
Serving Sydney Tradies and Renovators
- Trade pricing and bulk quantities: Competitive rates on volume orders. Call 1300 554 775 for trade and project pricing.
- Delivered to site across Sydney: Sydney, the Blue Mountains, Wollongong, and the Central Coast.
- Huge range, one supplier: SmartJoist alongside E13 beams, E10 framing, I-beams, and formwork LVL. Every engineered member from one supplier.
- Australian-owned family business: Western Sydney based. Real people, real stock, real advice.
Whatever the span calls for, we’ve got the joist.
Call 1300 554 775 or request a quote online and our team will help with depths, spans, and hangers for your floor or roof.
Frequently Asked Questions
What is SmartJoist?
An engineered timber I-joist used for floor and roof framing. Its I-shaped profile gives high load capacity at low weight, allowing longer spans than solid timber of the same weight.
What sizes are available?
Depths from 200mm to 360mm, with flange widths from 40mm to 90mm. Deeper sections suit longer spans; flange width is matched to the load.
What does H2S treatment mean?
H2S protects against termites for joists kept dry inside the building envelope. Confirm it suits your application and check the product specification sheet before ordering.
Why use an I-joist instead of solid timber?
I-joists run straighter, weigh less, and span further for their weight, giving flatter, quieter floors with less movement after the build and faster installation.
How do I choose the right depth?
Depth depends on span, spacing, and load. Call 1300 554 775 and our team can help, or work to your engineer’s floor or roof design.