8 great reasons to use Posi-Joist

In response to the need to reduce costs and improve efficiency in the building industry, MiTek has developed the Posi-Joist system. These specially designed flooring joists are chord trusses that combine the lightness of timber with the strength of MiTek’s Posi-Strut steel web to allow greater spans and easier installation than would be possible with any alternative timber products. Here are the main benefits that these unique flooring joists can offer you.

posi-joist  flooring joints

Longer spans

Posi-Joists can span much further than any of their competitors – up to a maximum of 8.3m. This reduces the need for loadbearing interior walls and gives you greater freedom when it comes to designing your building.

Posi-Joists are capable of spanning further than other flooring solutions. This is a result of their engineered, lightweight but robust structure, which uses the strength of Posi-Strut steel webbing to bear greater loads over greater lengths. Because you can now enjoy flooring joists with almost double the span of solid timber options, you can have fewer load-bearing interior walls. This opens up space both literally and creatively, enabling greater flexibility in your designs and allowing you to build larger spaces.

However, the benefits of the longer span of Posi-Joists go further than mere aesthetic and functional considerations. In addition to freeing you up to design the spaces you want, they also reduce your costs. The reduction in the need for interior support means that you can save on materials and labour.

Open web design

The basic structure of Posi-Joists consists of planks joined together with Posi-Strut steel webs. The gap between the planks, as well as the increased distance between joist centres, creates a service void, which provides plenty of space for the installation and maintenance of utilities such as plumbing and HVAC systems.

The open web design of Posi-Joists provides dual benefits. This design, together with the steel webbing that makes it possible, provide the strength that enables the longer spans discussed above. It also provides the extra benefit of a large service void, which allows for easy installation of utilities.

The combination of these two qualities gives Posi-Joists both versatility and efficiency. You have greater freedom with regard to your design choices and you can also reduce your costs and provide for faster and more efficient utility installation and maintenance.

Lightweight construction

Posi-Joists are made light and easy to handle, which makes storage, carrying and installation very easy for construction crews. Posi-Joists have tested extremely favourably in the UK and EU with regard to both fire resistance and sound resistance. These are both essential qualities in structures that will meet all the needs of a building’s owners and occupants. The unique design of Posi-Joists – provided the products are used with the correct floorboards, ensures that they meet the British and European standards for acoustics and fire. These standards are similar to those imposed by the South African Bureau of Standards (SABS), making Posi-Joists ideal and safe for use in construction projects here in South Africa.

posi-joist flooring system

Factory manufactured

Each Posi-Joist is manufactured offsite, ensuring a quality product. The final products are then delivered made-to-measure and ready to install. One of the primary benefits of MiTek’s Posi-Joists is that they make the installation and maintenance of HVAC and utilities much easier, quicker and more cost-effective.  The installation of utilities can be a costly and time-consuming part of the construction, but Posi-Joists help to reduce both the monetary costs and the time spent on completing jobs. How do these flooring solutions make this possible?

Wide fixing surface

The wide surfaces of Posi-Joists make the fixing of floorboards simple and help to minimise shrinkage.

Posi-Joists feature a unique open web design that provides a sizeable service void through which pipes and ducts can very easily be run. In addition, because of the increased strength and support provided over spans far longer than can be covered by competing products, Posi-Joists allow for greater distances between their centres.

The service void is an innovation that offers tremendous assistance to contractors in the service and utility industries, providing large, comfortable areas in which plumbers, electricians, and HVAC contractors can work comfortably and conveniently.

Acoustic performance

Posi-Joists have been tested for their acoustic qualities and comply with all the requirements for sound performance in the UK and Ireland. When it comes to sound resistance, Posi-Joists were tested with a variety of chipboard walking surfaces ranging in thickness from 202mm to 253mm. In each case, they met or exceeded the British Standards requirement of airborne sound resistance of 40dB. With the thicker chipboard, a resistance against 44dB was achieved.

Fire performance

Posi-Joists are fully compliant with British and European fire standards, making them ideal for use in South African construction projects too. he requirement for fire resistance of domestic intermediate floors is 30 minutes. Most of this resistance is actually provided by the floorboards, assisted by the flooring joists. In the UK and Europe, Posi-Joists were tested with a variety of plasterboards and were found to be compliant with the standards of both authorities. With both 15mm and 12.5mm Type A plasterboards, Posi-Joists were found to provide at least 30 minutes of fire resistance.

End details

There is a wide range of end details available, providing flexibility and eliminating the need for expensive hangers and metalwork.

With its performance and cost benefits, as well as versatility, this flooring solution can help you build quality floors at reduced costs. For more information on how you can enjoy these benefits on your next construction project,

Posi-Rafters are becoming increasingly popular for roof applications. As with Posi-Joist floor joists they are designed and manufactured offsite and tailored to the requirements of each individual project. They arrive made to measure and accompanied by full layout drawings for the speed of erection.
Posi-Rafters are suitable for both pitched roofs and flat roofs. They are stronger than solid timber rafters and so can span further and require less internal support.

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