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For designs & advice contact:
Chris Fairclough
i-joists@timberlink.co.uk
01630 638111
I-Joists technical manual (Download 22.8mb)
Advantages
JJI-Joists are designed to give a superior strength to weight ratio enabling the manufacture of longer and lighter structural members. The JJI-Joist, with a softwood flange.
- Is capable of spanning longer distances
- Is easier to handle
- Is easier to fix and nail
- Is less prone to splitting
- Is quicker to install
- Is extremely stable
- Reduces building maintenance
- Provides a less complex design solution
- Is simple to specify using superior software
- Has Part E compliant details available
- Is FSC®/PEFC® accredited
- Has very low embodied energy
- Has independently assured carbon accounting to PAS2050:2011
What are JJI-Joists?
JJI-Joists made by James Jones make up 40% of the UK market and are the brand most specified by architects. They are FSC® certified and manufactured in the UK to a very high specification using top quality C24 Scandinavian solid (not composite, as most other brands) timber horizontal finger jointed 45mm flanges, bonded to a 9mm OSB/3 web. JJI-joists, weighing around half the weight of solid timber, are very easy to handle and install on site.

JJI-Joist range and tolerances
JJI-Joists are available in a comprehensive range of sizes, designed specifically for the UK market. JJI-Joists are available in lengths of up to 12m. For information span and load information please see the interactive span table here
