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.

Product Range & Specification

JJI-Joists are available in a range of sizes familiar to the UK Construction Industry with joist depths ranging from 145mm to 450mm. JJI-Joists are constructed from 9mm OSB web and C24 softwood flanges ranging from 45mm to 97mm in width.

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 Range Table

Joist	A+	B+	C	D	Timber
Depth	47mm	63mm	72mm	97mm	Grade
145mm					C24
195mm					C24
220mm					C24
235mm					C24
245mm					C24
300mm					C24
350mm					C24
400mm					C24
450mm					C24

Product Tolerances

For more information on JJI-Joists please visit our Timber Systems Division Website