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posi joist

Posi-Joist – the metal web joist system

Our Posi-Joist factory in Rhyl will support our new venture of manufacturing bespoke timber materials which is fundamental to building our affordable homes programme over the coming years.

By taking a redundant building and giving it a new lease of life, we are hoping to play a key role in the regeneration of the local area. This new business will also assist to meet Welsh Government’s ambitions to build net zero carbon homes that are efficient for our tenants to live in.

This was made possible thanks to funding from the Welsh Government and the National Lottery. This funding will diversify our current workstreams and increase our ability to source local, build local and offer many employment opportunities to those furthest from the job market in line with our core principles.

As well as building the Posi Joist roof structures, the factory will also be a facility for the stick and panel modular build method with the possibility to have a flying factory in the yard.


  • Lightweight construction & easy to install
  • Free bespoke design service
  • Factory manufactured ensures a quality product, delivered made to measure
  • Reduced waste and environmentally sustainable
  • Drawing installation pack provided
  • Open web design creates a service void for ease of access, reducing installation costs
  • A wide range of end details provide flexibility and can eliminate hangers and metalwork
  • Longer span allow design freedom


STRENGTH – Posi-Joist combines the lightness of timber with the strength of the Posi-Strut steel web, allowing you to span far greater distances than would be possible with alternative timber products. This gives you unequalled design freedom across a wide range of applications for both floors and roofs in domestic, industrial and commercial applications. Posi-Joist allows a variety of internal room layouts within an external shell due to its clear spanning capabilities

SIMPLICITY – Easy access for the installation and maintenance of the services in the floor zone is the clear advantage of the Posi-Joist system, and with 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.

VERSATILITY – the depth, length and width can be adjusted to produce an enormous number of different specifications, each with clearly defined performance criteria.

The Posi-Joist Trimmable End incorporates a solid timber block which can be engineered with up to 130mm allowance for trimming on site. Top Hung joists can eliminate the need for hangers, saving cost and time on site.

EFFICIENCY – 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.

PERFORMANCE – Posi – Joist delivers outstanding acoustic performance, easily passing the relevant regulations. A comprehensive range of floor build ups have passed both BS and the more stringent EN standards for fire resistance, for both intermediate and separating floors.

Get in touch to find out more