Description

Certificate holder: Independent Building Suppliers Ltd.

IBS FIBRE® Flex is an internal wall and ceiling lining suitable for use in wet and dry areas, soffit and eaves lining. It can also be used as a cladding substrate (e.g. for tile or stone) but not when exposed to the weather.

IBS FIBRE® Flex is an autoclaved cellulose fibre-reinforced cement sheet available in in 4.5 mm, 6.0 mm and 9.0 mm thicknesses and sheet sizes from 300 mm – 1200 mm (w) x 2400 mm – 3000 mm (l). Refer to section 10 for further information.

Scope

1. IBS FIBRE® Flex have been certified for the uses as an internal wall and ceiling lining (in both wet and dry areas), as a soffit for use in eaves and as cladding backer subject to:

• a) in applications where a Material Group Number of 1 or more is required (clause C3.4(a)), the IBS FIBRE® Flex board shall be the 6 mm or 10 mm options and any waterborne or solvent borne paint coating is not greater than 0.4 mm thick.
• b) in applications where E3.3.3 to E3.3.6 applies the IBS FIBRE® Flex board shall be covered in a coating meeting the requirements of E3/AS1 section 3.1.2.

2. IBS FIBRE® Flex shall be installed in accordance with the IBS FIBRE® Flex Design & Installation Guide – December 2025.

3. Only aluminium window and door joinery compliant with NZS 4211:2008 (including Amendment 1) for the relevant wind zone or wind pressure and installed with vertical jambs and horizontal heads and sills, shall be used with IBS FIBRE® Flex.

4. Where IBS FIBRE® Flex is used as a backer for a cladding system:

• a) It shall not be exposed to the weather.
• b) with walls designed in accordance with NZS3604:2011 Timber-framed buildings, as modified by Acceptable Solution B1/AS1 and within the scope of Acceptable Solution E2/AS1, Section 1.1.1, or of at least equivalent stiffness to the framing provisions of NZS3604:2011, and situated in Wind Zones (as defined in NZS 3604:2011) up to and including Extra High; or;
• c) subject to specific engineering design in accordance with Verification Method B1/VM1 up to a maximum design differential ultimate limit state (ULS) wind pressure of 2.5 kPa, and;
• d) up to 10 m in height, and;
• e) with a risk score of 0-20, calculated in accordance with NZBC Acceptable Solution E2/AS1, Table 3.1.3.2: Suitable wall claddings, and
• f) situated:
  • i. in all exposure zones (excluding microclimates) as defined in NZS3604:2011, Paragraph 4.2.4, and;
  • ii. more than 1m from a relevant boundary.