Our Timber Systems Division was launched 27 years ago and has grown to become the UK’s largest manufacturer of certified I-Joists, branded as JJI-Joists. Today JJI-Joists have a 40% share of the UK's I-Joist market and are used by many major UK housebuilder.
Our JJI-Joist system combines the JJI-Joist products with custom sized glued laminated timber (glulam) and system specific metalwork to create a highly flexible offering, ideal for framing structural floors, roofs and walls.
Like all James Jones' products, the JJI-Joist production process has been independently audited, meaning we are able to provide accurate carbon negative numbers for those customers looking to measure the carbon footprint of their project.