In conjunction with timber or lightweight steel framing that complies with the NZ Building Code, or for existing buildings, where the designer and/or installer have established that the existing structure is suitable for the intended building work.

In accordance with I-Joist span tables or to the requirements of NZS 3604 as referenced in and amended by B1/AS1 Within the building envelope where hazard class H1.2 or less applies. Fixing material to be in accordance with section 4, NZS 3604:2011.

• Available in two section sizes — 240mm and 300mm
• Lengths up to 12m in increments of 300mm

• With a maximum floor load of 3.0 kPa UDL.
• In accordance with IBuilt JJ-IJoist span tables or to the requirements of NZS 3604:2011 as referenced in and amended by B1/AS1 or specific engineering design to AS/NZS 1170 [set].

The span tables in this design guide were determined in accordance with NZS 3603:1993 Timber Structures Standard which is an Acceptable Solution to the New Zealand Building Code Clause B1 Structure.

Guidance has also been taken from AS 1684.1:1999, Residential timber framed construction in the preparation of this guide and complies with NZS 3604:2011 Timber Framed Buildings which is an Acceptable Solution to NZBC Clause B1 Structure.

The requirements set out in the New Zealand Building Code will be achieved when floor joists and rafter framing components are installed in accordance with the design guide. This design guide has been prepared and designed within the requirements of the following standards:

• AS/NZS 1170:2002 Structural Design Actions
• AS 1720.1:2010 Timber Structures, Part 1: Design methods

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 NZS3602:2003, 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.

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 1,200 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.

• Available FSC certified