Posi-joists — 2021

In a solid joist floor, running pipes or wires means drilling holes—often in the wrong place, weakening the structure, or forcing you to build bulky dropped ceilings to hide the mess. With Posi-Joists, the services simply run through the open web. No drilling. No notching. No compromise. The void between the flanges becomes a pre-planned superhighway for your home’s nervous system: wiring, water lines, heating ducts, and even speaker cables all weave through the steel lattice without touching the timber.

At its core, a Posi-Joist is a hybrid. It consists of strong, solid timber flanges (top and bottom) connected by a sinusoidal or zig-zag steel web. This “I” shape gives it incredible strength-to-weight ratio. But unlike a traditional I-joist (made of OSB), the open steel web of a Posi-Joist is its superpower.

For decades, the soul of a house was written in its floor joists: solid chunks of timber, creaking under the weight of time. But step into a modern build or renovation today, and you might notice something different. Look up at the ceiling of the basement or down through the unfinished floor, and you’ll see a lattice of steel and wood—a truss-like web that looks more like a bridge than a floor. posi-joists

That is the , and it is quietly revolutionizing how we build from the ground up.

Here is the moment every homeowner falls in love with Posi-Joists: the plumber arrives. Or the electrician. Or the HVAC technician. In a solid joist floor, running pipes or

For the contractor, Posi-Joists are a logistical dream. They are lightweight (one person can easily carry a 5-metre joist), arrive precut to length, and sit perfectly level on the wall plate. No more hunting through piles of warped, twisted, or crowned timber. And because the open web allows air to circulate freely, there’s less risk of condensation or dry rot in sealed floor zones.

Because of their engineered design, Posi-joists can span much further than a traditional solid timber joist of the same depth. Want a 6-metre wide living room with no intermediate support wall? A Posi-Joist can handle it without the bounce or the “trampoline” feel of cheaper alternatives. The steel web distributes loads evenly, meaning fewer vibrations, less squeaking, and a floor that feels like concrete—solid, silent, and secure. No notching

So next time you walk across a room that feels unnaturally still, with no creak and no shudder, remember: the secret is hiding in the steel zig-zag below. That’s the Posi-Joist, doing its silent, brilliant work.