Appraisal number: 930 (2016)
Date issued: 25 Nov 2016
Triboard Construction System
The Triboard Construction System is a structural wall and ceiling panel system for use in the construction of Triboard Panel houses. All other aspects of the design and construction of Triboard Panel houses, such as foundations, floors, roofs, joinery, cladding, services and interior finishing, are conventional.
Triboard wall panels are 36 mm thick, and Triboard ceiling panels are 18 mm thick. Triboard panels are manufactured to consist of a strandboard core flanked by two outer layers of fibreboard.
Wall and ceiling panels are factory cut to shape and size, including window and door openings, by Triboard remanufacturers. All panel surfaces and exposed edges are prepainted by the remanufacturer prior to delivery to site.
On site, the wall panels are connected by specified structural connectors to a ground floor platform of either a concrete slab on ground or a suspended timber-framed floor. The exterior wall panels are strengthened externally by vertical timber battens, and the lintels can be strengthened either with a double thickness of Triboard or flitch plates.
For 2-storey houses, the upper floor construction is of standard timber framing and the upper floor wall panels connected to the floor.
Ceiling panels are installed over the wall panels, and roof trusses are fixed over the ceiling panels. Conventional ceiling systems may also be used. The building is then completed using conventional construction.
The Triboard Construction System has been appraised for construction of housing within the scope of clause 1.4 of AS 1684.2, i.e. single unit (detached) class 1 and class 10 buildings as defined by the Building Code of Australia (BCA) with the following limitations:
- Buildings must be single or 2-storey.
- The ground floor construction platform must comprise of a concrete slab on ground constructed in accordance with AS 2879 or a suspended timber-framed floor supported on a concrete wall or piled foundation constructed in accordance with AS 1684.
- The first (upper) floor is a suspended timber floor constructed in accordance with AS 1684.
- The first floor live load does not exceed 1.5 kPa.
- Roof construction comprises trusses or roof framing in accordance with AS 1684.
- Roof pitches must be greater than 5° but not exceed 35° to the horizontal.
Triboard ceiling panel diaphragms can be up to 8 m long.
This Appraisal covers internal walls, external walls up to the cladding line and an expanded polystyrene (EPS) insulation solution, ceilings up to the supporting frame and the following connections:
- Wall panel to floor.
- Wall panel to ceiling panel.
- Timber battens to wall panel.
- Ceiling panel to roof framing.
This Appraisal does not cover the following areas of construction:
- Exterior cladding (including sarking) and joinery.
- General or wet area finishing to walls.
- Foundation and floor construction.
- Services such as plumbing and electricity.
- Roof framing and cladding.
This Appraisal covers buildings sited south of the Tropic of Capricorn in wind regions A and B with
a wind classification of N1, N2 or N3.
The use of Triboard wall and ceiling panels in the following situations has not been assessed and is outside the scope of this Appraisal:
- Sauna rooms and the like where Triboard panels may be exposed to sustained high humidities
(greater than 85% RH) or liquid water.
- Where temperatures are in excess of 35°C over large areas for prolonged periods (e.g. ceiling
heating installations) or in excess of 50°C in localised areas (e.g. the area adjacent to a fuel-
- In skillion roofs or low-pitch roofs (less than 10° pitch).
Triboard Construction Manual for Australia, August 2002
Always refer to the Appraisal in full and the technical literature.