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IBS RigidRAP®-XT is an 8mm OSB3 (Oriented Strand Board) which has been manufactured specifically for New Zealand, for use as a bracing element and/or rigid air barrier. IBS RigidRAP-XT is the only triple layer rigid air barrier system available in New Zealand and comes laminated with a watertight wall underlay.

RigidRAP-XT is not only a temporary weather cladding, but it also provides bracing. IBS RigidRAP-XT has a 10mm lightweight rigid foam fixed to the rear of the board. This gives IBS RigidRAP-XT a R-Value of 0.39.

It replaces the traditional building wrap, and when compared to similar products it is more cost effective, easy to install and is lightweight.

As an OSB3 panel manufactured in accordance with EN13986:2004, it is suitable for use in humid conditions where the panel in-service moisture content does not exceed 20%.

Compliance with the NZ Building Code (NZBC) is established through Product Certification (CodeMark).

Compliance with NASH standard Part Two: ‘Light Steel Framed Buildings’ (or NZS 3404:2009 - Steel Structures) IBS RigidRAP-XT meets all the requirements of Table 23 of E2/AS1 from the compliance document for the NZ Building Code (NZBC).

Key Features
  • Reduces building time
  • Lightweight material, simple and easy to install
  • Provides rapid moisture protection of the building
  • Allows for interior construction to continue
  • Provides a greater level of site security
  • Reduces structural timber movement
  • Provides a rigid structure
  • Provides weather tightness for the building.
Scope of Use

Scope of use as an external wall bracing

IBS RigidRAP-XT may be used as a bracing element within the following scope:

In wind zones:

  • Up to and including extra high as defined in NASH standard Part Two 2019 “Light Steel Framed Building”
  • Up to 2.5 kPa ULS where the building is specifically engineered

Building scope

  • New buildings.
  • In conjunction with concrete and timber subfloor applications that comply with the NZBC
  • With all cladding types that comply with NZBC
  • In conjunction with a drained and ventilated nominal 20mm cavity system
  • With aluminium joinery complying with the NZBC. IBS RigidRAP-XT may be used as a bracing element in existing buildings, however in these cases IBS makes no claim as to the bracing value that will be achieved
  • Existing concrete and timber sub-floor structures where the designer and/or installer have assured themselves that the existing building is suitable for the intended building work

Scope of use as a rigid air barrier

Applied to the outer face of the exterior framing, IBS RigidRAP-XT will minimise the pressure difference across the wall construction, thereby forming part of a weathertight external envelope. When installed in accordance with Section 4, IBS RigidRAP-XT performs the function of a rigid air barrier with bracing capacity.

Limitations on Use
  • Allow a minimum of 4mm between panels both vertically and horizontally to accommodate dimension movement
  • Maximum spacings of wall studs must not exceed 600mm centres
  • A proprietary ‘Z’ flashing must be installed at mid floor level where IBS RigidRAP-XT is installed on multi levels
  • For wall heights greater than 3050mm horizontal wall joints are permitted, provided the panel joint is over solid blocking of the same gauge as the studs.
  • Other than mid floor level, all joints (vertical and horizontal) must be sealed with an IBS approved self-adhesive flashing tape as specified in section 3.7. IBS recommends 150mm flashing tape or a proprietary Z flashing for horizontal joints
  • Steel fixings and fastenings must be in accordance with table 4.1, NZS 3604: 2011
  • Do not install IBS RigidRAP®-XT if the building paper has delaminated from the OSB sheet

When specifying IBS RigidRAP-XT as a bracing element, the designer must take into account site specific conditions and the building with respect to, but not limited to, the following:

  • Environmental (exposure) zone
  • Wind zone
  • Wall bracing table for wind and EQ demand
  • Structural design loads
  • Structural framing requirements
  • Preparation of substrate
  • External envelope
  • Other materials likely to affect the performance of IBS RigidRAP-XT
Statement of Building Code Compliance

If designed, used, installed and maintained in accordance with the scope, this product will meet the following provisions of the NZBC:

  • B1 Structure: B1.3.1, B1.3.2, B1.3.3(a, b, f, h), B1.3.4
  • B2 Durability: B2.3.1(a), B2.3.2
  • E2 External moisture: E2.3.2 (contributes to), E2.3.7
  • E3 Internal moisture: E3.3.1 (contributes to)
  • F2 Hazardous building materials: F2.3.1
  • H1 Energy efficiency: H1.3.1 (contributes to), H1.3.2E (contributes to)

IBS RigidRAP-XT meets all the requirements of Table 23 of E2/AS1 from the compliance document for the NZ Building Code (NZBC).

Other Performance Attributes
  • OSB3 panel manufactured in accordance with EN13986:2004
  • Compliance with NASH standard Part Two: ‘Light Steel Framed Buildings’ (or NZS 3404:2009 — Steel Structures) 
B1 Structure compliant
B2 Durability compliant
E2 External Moisture compliant
External Moisture
E3 Internal Moisture compliant
Internal Moisture
F2 Hazardous Building Materials compliant
Hazardous Building Materials
H1 Energy Efficiency compliant
Energy Efficiency
Technical Properties
CodeMark CM70091

CM70091 Rev1 2022

Installation Guide
Care and Maintenance Guide

August 2021

Warranty General Terms

August 2021


August 2021

Since 1993, IBS has been working with the top building products producers from around the world to bring New Zealand a panel product range to help Kiwis build better.

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