A JJI-Joist is a structurally engineered timber joist, combining high-grade softwood with an engineered composite panel. Using advanced technology these components are combined to produce an innovative alternative to conventional construction timber. They are produced on the first purpose-made I-joist production line in the UK, custom built to produce JJI-Joists to UK preferred dimensions.
Structurally engineered timber joist, combining high-grade softwood with an engineered composite panel.Using advanced technology these components are combined to produce an innovative alternative to conventional structural timber.
Product Range & Specification
JJI-Joists are available in a range of sizes familiar to the UK Construction Industry. Depths range from 145mm to 450mm and widths from 45mm to 97mm.
Due to the unique form of the JJI-Joist British Board of Agrément Approval, it is possible to design and produce large volumes of non-standard JJI-Joists to allow for particular span and depth situations that cannot be covered by the standard range.
The standard range of products available is indicated in the following table.
Product Code Breakdown
Flange Width Designations
Product Range Table
Joist A B C D Timber
Depth 45mm 60mm 72mm 97mm Grade
* This product is intended for use
as a timber frame wall stud only.
145mm C16 *
Overall Joist Length +/- 3.0
Overall Joist Depth +/- 2.0
Flange Thickness / Depth +/- 2.0
Web Thickness +/- 0.8