Products | I-Joists

Product Overview:

The JJ-IJoist is an engineered composite ‘I-Joist’ manufactured by James Jones and Sons Ltd that offers several advantages over traditional structural timber beams, including:

• longer lengths,
• a composition that resists shrinking and warping,
• an excellent strength-to-weight ratio,
• dimensionally stable.

Constructed from high-grade finger-jointed Scots Pine for the top and bottom flanges and an Oriented Strand Board (OSB) webbing, I-Joists allow large holes to be cut for ducting, plumbing, and cabling.

Treated with Koppers FramePro™ preservative (Boron) treatment, I-Joists are suitable for all hazard class H1.2 applications.

Lightweight and easy to install, you will find the JJ-IJoist will be perfect for your next midfloor or rafter project.

James Jones & Sons Ltd

A 5th generation family-run business, James Jones & Sons Ltd is one of the UK’s largest and most progressive timber processing companies with core activities across the whole timber industry. Operating from 25 sites across the UK, and 13 sites in Australasia they employ over 2,100 people worldwide. Their Timber Systems Division launched over 20 years ago and has grown to become the UK’s largest manufacturer of certified I-Joists.

Features & Benefits

• Available in two section sizes, 240 & 300mm,
• Available in lengths up to 12m,
• Lightweight and easy to install,
• Available Forest Stewardship Council® (FSC®) certified,
• Available as part of our Midfloor design and supply service,
• Simple specification using span tables, or with Hyne Design software.

Range

Available in 300mm increments up to 12m long.

Applications

JJ-IJoists are best used for floor joists, rafters or purlin applications. They are a major component of IBuilt’s midfloor design & supply service.

Building Code Compliance

JJ-IJoists meet the performance requirements of the New Zealand Building Code.

B1 Structure:

The span tables and construction details contained in this document have been developed primarily for domestic/residential applications in accordance with the following standards:

• NZS3604:2011 'Timber Framed Buildings',
• NZS3603:1993 'Timber Structures Standard',
• NZS/AS1720.1:2022 'Timber Structures – Design Methods'.

Loading data is taken from AS/NZS1170:2002 'Structural Design Actions' to satisfy the requirements of Section B1 of the New Zealand Building Code

B2 Durability:

IBuilt JJ-IJoists are pressure-treated with Koppers FramePro™ preservative (boron) treatment. Boron-treated joists are limited to internal, dry-protected areas where moisture levels are maintained below the requirements specified in NZS 3602:2003, i.e. in hazard class H1.2 applications only.

Buildings must remain weather-tight and structural framing members must be protected from internal and external moisture exposure.

Refer to the JJ-IJoist PASS (Product Assurance Supplier Statement) for further information.

Holes in I-Joist Web

Service holes can be cut in the IJoist web to accommodate electrical wiring, plumbing, and other utilities. For specific details, please refer to the JJ-IJoist Installation Guide.

Chain of Custody

JJ-IJoists are manufactured from sustainable sources and are Forest Stewardship Council™ (FSC™) certified. All product claims are independently verified by a certification body on an ongoing basis.

Certificates: