Triboard Construction System
- Appraisal number 481
- Valid from
- Information provider
- BRANZ Limited
- Information type
- BRANZ Appraisal
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 Re-manufacturers. All panel surfaces and exposed edges are pre-painted by the Re-manufacturer prior to delivery to site.
Onsite the wall panels are connected by specified structural connectors to a ground floor platform of either concrete-slab-on-ground or suspended timber framed floor. The exterior wall panels are strengthened externally by vertical battens, and the lintels can be strengthened either with a double thickness of Triboard or flitch plates.
For two-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 use in single unit (detached) Risk Group SH housing which meets the scope of Clause 1.1.2 of NZS 3604 with the following limitations:
- buildings must be single or two-storey; and
- in NZS 3604 Wind Zones up to and including Extra High; and
- in all NZS 3604 Earthquake Zones; and
- the ground floor construction platform must comprise one of: a concrete slab-on-ground or a suspended timber framed floor constructed in accordance with NZS 3604; and,
- the first (upper) floor is a suspended timber floor constructed in accordance with NZS 3604; and
- the first floor live load does not exceed 1.5 kPa; and
- roof construction comprises trusses or roof framing in accordance with NZS 3604; and
- roof pitches must not exceed 35º, nor be less than 5º; and
- Triboard ceiling panel diaphragms not exceeding 8 m in length.
This Appraisal does not cover the general or wet area finishing to walls or ceilings.
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 they may be exposed to sustained high humidity (greater than 95% RH) or liquid water.
- where temperatures are in excess of 35ºC over large areas for prolonged periods (e.g. ceiling heating installations) or in excess of 50ºC in localised areas (e.g. the area adjacent to a fuel burning appliance - see Paragraph 11.1).
- in skillion roofs.