Posi-Joist Span Calculator

POSI-JOIST Span Calculator

Whats the Maximum Span I can Have?

Posi-Joist design is complex and impacted by many factors. Our Span calculator tool makes it simple to work out the spans you can achieve with Posi-Joists. It’s not an exact science but this guide will allow you to get started!


As there are so many design solutions and ways to meet your span, the actual span can only be calculated by our experienced designers who will take into account many factors such as your floor loads, design space of joists, depth of your floor zone and services.

POSI-JOIST Span Calculator

First we need to know your floor joist zone

POSI-JOIST Span Calculator

Or enter your length to check the clear span

Ready To Find Out More, Contact Our Design Team For A Free Quote And Interactive 3D Design

Hampshire Engineered Timber Solutions are a MiTek Posi-Joist manufacturer and benefit from the very latest industry leading design and layout software to create project specific designs.

Detailed output drawings can be provided for approval and manufacture, but it is the 3D viewer tools that really separates Posi-Joist from the rest.

Designs are shared via a free cloud based 3D viewing platform, allowing for a fully interactive 3D model of the floor or roof to be viewed on any internet enabled device. No apps are required, you will be sent a link to your model and simply click it to view in your browser..