RAB® Board | James Hardie

A pre-sealed air barrier for use behind cavities in medium to high-rise facade construction.


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 acrylic sealer applied on RAB® Board surface acts as moisture repellant and prevents the timber frame from moisture. RAB® Board can be used in both residential & commercial markets.
6mm thick x 2450 or 3000mm long x1200mm wide


  • Prevents the frame from being exposed to air leakage due to high wind pressures.
  • Provides a drainage plane to manage moisture within a cavity.
  • Painted green for easy identification on site.
  • RAB® Board is suitable to resist high wind pressures within the cavities.
  • Provides excellent temporary weather protection before final cladding is erected.
  • RAB® Board also achieves good bracing values.
  • Product warranty of 15 years.

Fire Resistance Rating: 30 or 60 minute fire resistance rated systems can be achieved when installed as per the current James Hardie Fire and Acoustic Technical Specification.