RAB® Board is a pre-sealed rigid air barrier for use behind cavities in medium to high-rise facade constructions. It forms part of a drained and ventilated cavity or rainscreen systems and helps in equalizing the wind pressures within a cavity to that experienced on a building façade. It is normally used in specific engineering design projects. RAB® Board also forms an effective drainage plane which helps in draining moisture. The sealer applied on RAB® Board surface acts as moisture repellant and helps protects the timber frame from moisture.
New Zealand Building Code (NZBC)
The product will, if employed in accordance with the supplier's installation and maintenance requirements, assist with meeting the following provisions of the building code:
- Clause B1 Structure: Performance B1.3.1, B1.3.2
- Clause B2 Durability: Performance B2.3.1(a), B2.3.1(b), B2.3.2
- Clause C3 Fire affecting areas beyond the fire source: Performance C3.6, C3.7(a)
- Clause E2 External moisture: Performance E2.3.2, E2.3.3, E2.3.4, E2.3.5, E2.3.6
- Clause F2 Hazardous building materials: Performance F2.3.1
- Clause H1 Energy efficiency : Performance H1.3.1
The product meets the requirements set out in the following documents, or relevant parts of cited standards within the documents:
Structure - B1: RAB Board installed as per its installation manual has been assessed to withstand wind pressures for various wind zones as per NZS 3604 and Specific Engineering Design (SED) wind zones up to a wind pressure of 4.5kPa and meets the requirements of B1.3.1, B1.3.2 and B1.3.4 of Clause B1. RAB Board is tested as per BRANZ P21 test and is suitable for use in bracing applications for buildings within the scope of NZS 3604.
Durability - B2: RAB Board is manufactured in accordance with AS/NZS 2908.2 and meets the durability performance requirements of section B2.3.1(a) and B2.3.2 of Clause-B2.
External Moisture - E2: RAB Board has been tested and meets the requirements of Table 23 of E2/AS1.
Hazardous Building Materials - F2: RAB Board complies with the requirements of F2.3.1 and will not present a health hazard when handled as per its technical specifications.
Fire Performance - C: RAB Board has been assessed and is classified as non-combustible material and are suitable for use in fire rated external walls close to boundaries.
The product has and can make available the following additional evidence to support the above statements:
RAB Board is a 6.0mm thick fibre cement sheet which is sealed on the face and edges and is suitable for use as a rigid air barrier in Extra High Wind (EH) zones or in wind pressures up to 4.5kPa. It complies with the requirements of Table 23 of E2/AS1. It is suitable for use as rigid underlay as per the requirement of section 9.1.4 of E2/AS1. RAB Board is also suitable to withstand high wind pressures experienced on building facades where it creates a wind barrier which equalises pressure within the cavity to the external pressures. Most flexible building underlays cannot withstand high wind pressures due to the fatigue caused by positive/negative pumping actions created by gusting winds within the cavity and on building façade.
Fix as per the rigid air barriers installation manual.
When being used as a bracing element or in a fire rated system fixings are closer together. Refer to the Bracing Design Manual and/or the Fire and Acoustic Design Manual respectively.
RAB Board has a standard product warranty of 15 years
We aim to conduct business in an environmentally sound and sustainable manner and to use management systems and operating procedures to identify, monitor, control and reduce the impact of our operations and our products on the environment. We strive to continually improve our manufacturing processes and product formulations to minimise our carbon footprint. As such, we are committed to ecologically sustainable development (ESD) principles.
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