New-look Posi Span Calculator Gets Technical Upgrade

As the uptake of Posi-Joists grows in the UK and Ireland, MiTek has expanded its Posi Span Calculator to help specifiers generate more detailed data. What’s changed and how does it work?

The adoption of Posi-Joists is on an upward trajectory in the UK and Ireland construction sector. Specifiers looking for solutions to help meet the demands of The Future Homes Standard for newbuilds are adopting the versatility and flexibility Posi-Joists offer. Ideal for supporting the integration of services like MVHR, Posi-Joists also offer a lightweight but strong joist option for wide spans, and are precision engineered offsite. In 2022 Posi-Joist and connector plates were Environmental Product Declaration (EPD) verified for the UK market, which quantified the environmental credentials of both products.

On the back of the product’s continued growth and development, MiTek has upgraded its Posi Span Calculator, ( to make it easier for specifiers to integrate Posi-Joists into their designs. Building on the existing calculator, architects, self-builders and engineers, for example, can now use it to get an instant idea of whether Posi-Joists are right for their project. And, if they are, what technical specs and quantities they’ll need to support the design.

Select your spec, step-by-step

The calculator has been re-designed as a simple to use step-by-step tool. Users will need to select the required joist application, either floor, flat or pitched roof, choose from a list of pre-defined loading configurations, specify the overall length of the joist(s) and the maximum required joist depth. A range of options are then presented, that provides the required information for specification purposes.

“We know the popularity of Posi-Joists continues to grow and we want to help facilitate the interest,” says Adam Williams, Director of Technical and Engineering Services at MiTek UK and Ireland.

“Upgrading our calculator in the way we have, now gives specifiers the opportunity to identify what products they need themselves. Created by MiTek’s in-house expert design team, thousands of combinations are fed into the calculator to give optimum results for the end user who can then go away with the results and reach out to a manufacturer, armed with information to get them started.”

Once the details have been generated, specifiers can use the ‘Find a manufacturer’ tool on the Posi Span Calculator homepage to search for local timber manufacturing companies to contact and start the Posi-Joist journey. If the measurements needed are outside the parameters of the Posi Span Calculator, then the design team at MiTek are available and can help generate specifications for you.

The new-look and upgraded Posi Span Calculator is now available to use – start generating your specifications today. The MiTek design team can help with the most complex of projects.

Contact them at: or call 01384 451408.

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