Rethink Façade Design with RAB Board

Introducing RAB Board, the rigid weather defence barrier by James Hardie. Designed as a high-performance weather barrier, RAB Board is a fibre-cement sheathing installed behind external cladding or rainscreens to improve the durability, performance and comfort of the building.

Smart façade design is key when it comes to protecting a building from the elements. Finding a balance between water and condensation management, air-tightness and non-combustibility can be challenging - particularly when it comes to designing taller and more complex façades. This is why a solution that offers protection and peace of mind is the only way to overcome poor building performance and reduced comfort levels for occupants.

How does RAB™ improve building performance and lower risk?


Improved weatherproofing for the life of the building

The RAB™ Board solution creates a continuous weatherproof seal across the building. This innovative solution ensures full flexibility when it comes to cladding selection. James Hardie's durable CoreShield™ penetrating sealer technology provides a barrier that stops moisture getting in, while RAB™ Board’s advanced breathable design allows vapours to escape. This combination protects the framework and water sensitive materials from mould and degradation, during and after the construction process. Building performance is therefore improved through condensation management and thermal efficiency improvements.


Made for high wind pressures

RAB™ Board’s exceptional strength helps equalise air pressure inside the wall cavity, allowing buildings to stand up to 7kPa high wind pressures. Because RAB™ Board is made from fibre cement, high wind pressures won't cause tears or openings, a fact that is especially important in taller buildings or in cyclone-prone regions.


Suitable for non-combustible construction

RAB™ Board is deemed non-combustible and suitable for all classes of building, offering ongoing peace of mind.


Quick and Easy Install

RAB™ Board is lightweight, easy to cut with a 'score and snap' knife, and screw or nail to the frame, while the joints are simply taped. Leave RAB™ Board exposed for up to 180 days before installing the cladding.

How does it work?

RAB™ works by equalising the air pressure within the external wall cavity, making buildings airtight and providing superior weather-tightness, structural bracing and fire protection. This differs to traditional flexible wall underlay, which can struggle to perform in challenging weather conditions.

RAB™ Board not only provides a rigid air barrier, but due to its patented CoreShield™ sealer technology, it provides an all-in-one rigid, water-resistant and a vapour permeable membrane, meaning there is no need for additional sarking or treatment.

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Download the RAB Board brochure and installation guide.

RAB™ Board v HardieWrap™

3 Simple Questions to Determine What To Use
Is the building wind pressure
> 2kpa?
Does the building have an
airtightness / energy effeciency requirement (eg, Green Star)?
Is the façade cladding a sealed system (eg, ExoTec™) or a rainscreen (eg, ceramic)? Yes Yes No No
Open Sealed

James Hardie Deemed-To-Satisfy Wall Solution

Reduce risk and mitigate building failure by using the James Hardie deemed-to-satisfy wall solution. All components are deemed non-combustible or exempt in accordance with NCC C1.9. The James Hardie façade solution has also been extensively tested at James Hardie’s state-of-the-art R&D facility and other accredited laboratories.

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Villaboard™ or Plasterboard Internal Lining

Deemed non-combustable

Bulk Insulation

Must be tested

RAB™ Board

Deemed non-combustible

ExoTec™ Top Hat Fixing System

Deemed non-combustible

ExoTec™ Façade Panel

Deemed non-combustible

Weather Resistant
Deemed Non-Combustible
Resistant to Moisture
Speed of Installation

Features & Benefits

  • Superior weather defence behind ventilated rainscreen cladding
  • Suitable for non-combustible construction
  • Resistant to moisture and the elements
  • Breathable, allowing water vapour to get out
  • Provides 180 days protection during construction
  • Withstands wind pressures up to 7kpa
  • 10 year warranty

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