Product Range

What is a JJI-Joist?

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 47mm 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.

James Jones & Sons Ltd. is pleased to announce our new Interactive Span Table. Visitors can enter their span and load conditions and receive a list of joists suitable for the application. Please use the link below to access this feature.

• Download JJI-Joist Construction Details for Floors.
  (JPEG Format)
• Download JJI-Joist Construction Details for Floors.
  (AutoCAD 2005 DWG Format)
• Download JJI-Joist Construction Details for Roofs.
  (JPEG Format)

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	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

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