What is a Posi-Joist?

Put simply, a Posi-Joist (also known as a metal web joist, engineered joist or simply floor joist), is a system of timber and steel webbing that can be used for both floor and roof structures. Each design is unique to suit a chosen project and can be manufactured to a range of different widths, depths and lengths. The below image is a good example of the structure achieved by this mixture of materials. 

What are their benefits?

Service Routing: One of the main benefits of a Posi-Joist over a traditional floor joist is the ability to easily route pipework, ducting, and cabling through the open structure. With a standard timber floor joist, installers must drill or cut sections to fit services, potentially weakening the structure. Posi-Joists, however, feature an open web design, allowing unlimited service routing without compromising strength.

Strength: Compared to a traditional wooden floor joist, Posi-Joists offer superior strength and stiffness. This enables longer spans, reducing the need for load-bearing walls or steel beams, ultimately increasing design flexibility.

Weight: Unlike a solid timber floor joist, Posi-Joists use less material while maintaining strength, making them significantly lighter and easier to install—often without requiring crane hire.

No Shrinkage: A common issue with a traditional floor joist system is shrinkage, which can lead to squeaky floors over time. Posi-Joists eliminate this issue as they do not suffer from shrinkage or distortion.

Quality: Every Posi-Joist is designed using specialist software and manufactured in a factory-controlled environment, ensuring precision and consistency. We also provide 3D renders, allowing you to visualise the finished product before construction begins.

Want to know how Posi-Joists are made? Watch our YouTube video here.

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