Benefits

Consisting of structural LVL flanges and a structural plywood web connected using a Type A waterproof bond, hyJOIST is strong, light and easy to install.

Straight, uniform & dimensionally stable in a lightweight form
Greater design flexibility for an economical floor joist layout
- Available in 10 section depths
- 3 different flange widths
- Long lengths up to 13.2 metres
Easier installation of services within the floor space
Easier to install compared to hardwood and steel alternatives
Sourced from environmentally sustainable plantation pine
Stringent quality control - EPWAA certified

Suitable Applications include

Floor joists for houses and commercial floors
Roof rafters & purlins for houses and commercial systems (suited to low pitch applications)

HYJOIST DISTRIBUTORS

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FREE TIMBER DESIGN SOFTWARE

Peace of Mind against terminates - hyJOIST H2-S Terminator

hyJOIST is also available treated (H2-S) for protection against termites and other insects in above ground, weather protected applications in areas south of the Tropic of Capricorn. It gives all the benefits of structural LVL with added termite deterrent qualities.

Backed by a 25-year fully transferable guarantee from the chemical manufacturers

Each beam is treated to the core during manufacture.
Clearly marked with H2-S for ease of identification
Backed by a 25-year fully transferable guarantee from the chemical manufacturers

Field & Product Support

hyJOIST is supported in the field by an experienced engineering support group able to assist with enquiries ranging from design to installation advice.

PHONE - 1800 808 131

Local TECHNICAL MANAGERS

Click here to locate your local technical manager

Range	Depth (mm)	Pieces per packs
		Flange Width (mm)
		45	63	90
HJ200 45	200	41
HJ240 45	240	41
HJ240 63	240		31
HJ240 90	240			21
HJ300 45	300	41
HJ300 63	300		31
HJ300 90	300			21
HJ360 63	360		31
HJ360 90	360			21
HJ400 90	400			21

Legend Treatment
	H2- S Treatment
	H2-S treated or untreated

More options for more economical floor joist layouts

Select the economy section (HJ240 45, HJ300 45 & HJ360 63) of appropriate depth to accommodate the spans of the main area of the floor. Cater for any larger spans in the floor area using the wider flange options of corresponding depth.

Quick Links

Description and Applications
Certification and Compliance
- Technical Literature
Handling and Installation

Technical enquiries

Expert technical support is only a phone call away. Carter Holt Harvey provides expert technical support through an in-house network of engineers and technical managers. This free service is available by simply calling 1800 808 131.

Description and Applications

hyJOIST is an engineered I-Joist manufactured using structural LVL flanges and a plywood web connected using a Type A waterproof bond.

Applications

hyJOIST is suitable for structural applications including residential and commercial floor and roof rafter systems, and industrial purlins. hyJOIST is not intended to support brickwork or other heavy masonry products.

Treatment for Durability

hyJOIST H2-S Terminator is available in all sizes and is part of the Carter Holt Harvey Terminator range. hyJOIST H2-S Terminator is treated against termites south of the Tropic of Capricorn. The treatment is applied to the glueline during manufacture to achieve full termite protection to the core of the beam. No further sealing is required on cut ends or holes.

Moisture content

hyJOIST, at time of despatch from the manufacturing site has a moisture content of between 8-15%.

Structural grading

The properties of hyJOIST have been determined by testing as required by AS/NZS 4357, and are not substitutable for F grades, MGP grade, or other proprietary I-joists. Design verification using the Carter Holt Harvey free designIT software or selection guide (located in the hyJOIST design guide) is required to ensure suitability.

Certification & Compliance

hyJOIST flanges are manufactured in accordance with AS/NZS 4357, and the plywood web is manufactured in accordance with AS/NZS 2269. hyJOIST is product certified by the Engineered Wood Products Association of Australasia (EWPAA), which is JAS-ANZ certified. Participation and compliance with this process based quality control scheme ensures ‘Evidence of Suitability’ in accordance with Clause 1.2.2 of the Building Code of Australia (BCA).

Formaldehyde Emissions

All hyJOIST is manufactured using an 'A' Bond with less than 0.3mg/l Formaldehyde (equivalent to Super E0) emissions from the final product.

Technical Literature

See the brochure tab for all available literature related to hyJOIST.

Handling and Installation

Storage

The following recommendations regarding storage are made in order to ensure that the full benefits of hyJOIST as a dry, straight and true material are available at the time of installation.

Stack on level bearers to keep flat and straight.
Stack well clear of the ground for good ventilation.
Store under cover to keep dry prior to installation.

Note: After installation, exposure to sun and rain for normal periods of construction is not a cause for concern.

General Installation

hyJOIST should be installed strictly in accordance with the details supplied in the hyJOIST Installation Guide.

Technical Note: Rimboard

Carter Holt Harvey sometimes receive requests to assist specifiers with technical advice on other generic products when used in conjunction with hySPAN LVL and hyJOIST Engineered I-Joists. The following Technical Note entitled 'Rimboard' is an example of this - Download.

Racking Through Floors

Modern house designs often feature large open plan living areas with large windows or doors to 'bring the outdoors inside'. In two storey houses this normally means deep section engineered floor joists capable of spanning over lower level open areas.
More information is contained in the hyJOIST design guide and hyJOIST installation guide

Racking Through Floors - Detail

hyJOIST Cantilevers

hyJOIST floor joists are capable of meeting the loading requirements for cantilevers as defined in AS/NZS 1170. For external use, hyJOIST floor joists must be protected from becoming wet by a fully waterproof deck. In the case of non-waterproofed decks the use of outriggers of suitable natural durability or preservative treated to H3 as per AS/NZS 1604 is suggested. Outriggers can also provide a step down to the deck reducing the likelihood of water ingress at openings.
More information is contained in the hyJOIST design guide and hyJOIST installation guide.

Health & Safety

The MSDS available from the website details all health and safety precautions required when using hyJOIST

Environmental certification

hyJOIST is manufactured from 100% renewable plantation timber. All timber is sourced from Australian Forestry Standard and/or FSC certified forests.

Technical Publications

hyJOIST: Introduction

6 pages
Format: PDF
FileSize: 1.2MB
Download File>

hyJOIST 'Options Range Design Guide'

12 pages
Format: PDF
FileSize: 509K
Download File>

hyJOIST 'Options Range - Guide for installation'

16 pages
Format: PDF
FileSize: 767K
Download File>

hySPAN: Use in weather exposed applications

2 page
Format: PDF
FileSize: 208K
Download File>

MSDS

	Hyjoist H2-S Terminator Material Safety Data Sheet (MSDS)
	Format: PDF Filesize: 1KB Download file >>

	Hyjoist Material Safety Data Sheet (MSDS)
	Format: PDF Filesize: 1KB Download file >>

Carter Holt Harvey is committed to on-going reviews of its MSDS's to ensure they reflect all currently available information. In the event that you require more detail on any MSDS or would like to confirm that you have the most recent MSDS for a particular product, please contact the Marketing Department via phoning 132 321.

New curved technology block gives students the edge

Peddle Thorp Architects (Hamilton) are linked to a multinational partnership of architects with offices in Australia, South East Asia and in the UK. Each partnership is an independent business with their own focus and specialities. The Hamilton studio, where architect Mike Angelo is based, has developed an extensive portfolio of educational buildings throughout the Waikato region. Renovations to Peachgrove Intermediate in Hamilton East is a recent project, in which Angelo added an extra storey to an existing classroom block and an extra space for innovative young minds.

There are many school projects around at the moment, for both builders and architects. Angelo explains the phenomenon: “The work never stops. Many schools in the Waikato were built in the 40’s and 50’s and need to be updated. Enrolments are increasing, cities are growing…”

Peachgrove Intermediate is on the main arterial through Hamilton East. The school is for those students 10 to13 years of age who, in New Zealand, do intermediate studies before they move on to high school. It is a preparation time, getting students accustomed to being in different classes for different studies.

This school was built in the 40’s and had an aging technology block. This four classroom block is at the front of the school and is highly visible from the main arterial so the school wanted it to look its best. The classrooms are used to introduce the students to various areas – food technology; woodwork; metal work; and soft materials. Other than an improvement to the building, the brief was to add a digital projection room and a central design room, that is a gathering place off the four separate classrooms where ideas could be exchanged, projects developed and research done before moving on to the hands-on workshops.

Angelo developed the curved room, one long suite, to be the central linking element on the ground floor by extending a new top storey out two metres. The long suite creates direct visual links to the rest of the building with the top storey addition housing the digital projection room. This was stage one, with the refurbishment of the existing classrooms as stage two.

The additional top storey has a barrel vault design, which was aimed at adding a digital projection room for the students, without adding too much height to the building visually. The original building had a flat roof. The new plan straddles the old roof using steel portal legs and Hyspan as the floor between. To form the barrelled roof, Hyspan was used for its long straight spans and to help to create the curve of the roof easily. The Hyspan members were not curved but supported the curved structure. “It was really very simple,” he says, “I could have done it myself.” Though he suggests the builder might not have agreed to that.

Commenting on using the futurebuild engineered building products and supporting software, Angelo says: “I have used Hyspan a lot prior to this. Builders find it stays straight and easy to cut and handle on-site and from our point of view there are the big long spans, which you need for classrooms. We also use designIT software in the office. I see that software as a model for how these things should work – it is very easy to use. We get a lot of software which just stays on the shelf, whereas designIT works well.”

Hyspan features not only in the roof of the top storey but also over the ground floor extension and the curved verandah walkway. The extended Hyspan beams in combination with bold use of primary colour and glass has modernised the face of the block.

The Hyspan is also a key design feature in the interior. The Hyspan beams are semi-exposed as purlins, curved exposed ribs in the ceiling and painted white in the barrel vault section through to the ground floor extension. They are deep beams of 450 x 63 millimetres but only a small part of the sections are showing with the remainder framed in by acoustic tiles. These were required because the room will be used for digital projection and presentations.

The digital projection room is part of the current push at the school for technical proficiency in these areas. Peachgrove has been moving rapidly into the digital world and now has a new principal who is also driving the school in that direction. The students all have electives now that involve the use of advanced computer skills. It seems that there is also movement forward in the area of school design and architecture. Architects like Peddle Thorp are needed to bring the buildings themselves into the 21st Century in terms of both the innovative spaces created and the materials and methods used on the project.

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