I-joists
We are an authorised distributor of James Jones & Sons timber i-joists.
The JJI Joist is a structural, engineered timber i-joist, manufactured to UK preferred dimensions. Ideally suited for both residential and commercial applications, JJI Joists are available in a range of sizes (see our product comparison chart below for more information) and are FSC® and PAS 2050 accredited.
Product features and specifications
Superior strength
With a high strength to weight ratio, i-joists can be supplied in longer lengths than solid timber.
Quicker to install
I-joists weigh much less than solid timber joists, so are easier and faster to install.
High structural efficiency
I-joists don’t bow, warp or split, so your building will be stronger.
Durability and treatment
Standard product
JJI-Joists are untreated and when used in a Service Class 1 or 2 environment, the European Technical Assessment (ETA) certificate advises that the joists can be expected to have a service life in excess of 50 years.
Preservative treatment
JJI-Joists are also available with preservative treated timber flanges. This allows their use in Use Class 2 conditions in accordance with BS EN335-1, and Hazard Class 2 conditions in accordance with NHBC. This treatment does not affect the structural properties of the JJI-Joist. Please note a minimum order quantity will apply.
Compare joist depths and sizes
| Joist depth | A+ | B+ | C | D |
|---|---|---|---|---|
| 47mm | 63mm | 72mm | 97mm | |
| 195mm | ||||
| 220mm | ||||
| 235mm | ||||
| 245mm | ||||
| 300mm | ||||
| 350mm | ||||
| 400mm |
Adam Ding
Department Manager Stairs & I-Joists 01480 309900 [email protected] Request a quoteWe’ve worked with David Smith st Ives for a very long time. We need suppliers who can cope with our workload, and David Smith St Ives has plenty of capacity.
Kevin Dundas, Supply Chain Manager, Willmott Dixon
