About Posi-Joists

Posi-Joist combines the lightness of timber with the strength of the Posi-Strut steel web to produce a floor and roof system. Posi-joists have a good weight-to-span ratio allowing much design freedom for domestic, industrial and commercial flooring. It also allows a variety of internal room layouts within an external shell due to its clear spanning capabilities.

Easy access for the installation and maintenance of services in the floor zone is the clear advantage of the Posi-Joist system, and with the ever increasing need for MVHR (Mechanical Ventilation and Heat Recovery) systems, Posi-Joist provides a perfect and simple solution that just isn’t possible with alternative solid timber products.


Whilst an initial linear metre cost comparison with solid joist alternatives may suggest otherwise, Posi-Joist’s ability to span greater distances than its timber competitors, coupled with its open web design gives the contractor several important cost saving advantages.

The installation of services and utilities is far simpler and quicker with Posi-Joists, reducing both labour costs and build-up time on site.

Joists are manufactured in a controlled offsite environment ensuring a quality product, and are delivered ‘made to measure’ allowing for speedy erection. What’s more, Posi-Joists will often eliminate the need for load-bearing intermediate walls, all of which can dramatically cut overall building costs.


Exceptional floor performance from a wide fixing surface makes flooring easy, controls shrinkage and with precision engineering, it all reduces those tiresome return visits and remedial work.

More benefits such as the unique open web design provide an area in which Plumbers, Electricians and Mechanical Ventilation and Heating Contractors will find it easy and convenient to work.

The job’s done far more quickly and the contractor makes worthwhile savings.


Design flexibility is inherent in the concept of the Posi-Joist. The depth, length and width can all be adjusted to produce an enormous number of different specifications, each with clearly defined performance criteria. In addition, end details of the Posi-Joist can be altered to give a variety of support conditions.

Posi-Joists can incorporate a Trimmable End, incorporating a solid timber block which can be engineered to give up to 130mm allowance at each end for trimming on site.