Appraisal number: 721 (2019)
Date issued: 9 Aug 2019
BGC Durabarrier™ Rigid Sheathing/Air Barrier
Description
BGC Durabarrier™ Rigid Sheathing/Air Barrier is a face-sealed fibre-cement sheet designed for use as a rigid wall underlay behind wall claddings and as a bracing system to resist wind and earthquake loads on timber-framed buildings.
Scope
BGC Durabarrier™ Rigid Sheathing/Air Barrier has been appraised for use as a rigid wall underlay and temporary weather-protecting sheathing on timber-framed buildings within the following scope:
- The scope limitations of NZBC Acceptable Solution E2/AS1 paragraph 1.1.
- With absorbent wall claddings directly fixed to framing.
- With non-absorbent wall claddings directly fixed to framing with a flexible wall underlay over the Durabarrier™ Rigid Sheathing/Air Barrier.
- With absorbent and non-absorbent wall claddings installed over an 18 mm minimum drained cavity.
- With masonry veneer in accordance with NZBC Acceptable Solution E2/AS1.
- Situated in NZS 3604 wind zones up to and including extra high.
BGC Durabarrier™ Rigid Sheathing/Air Barrier has also been appraised for use as a rigid wall underlay and temporary weather-protecting sheathing for buildings within the following scope:
- The scope limitations of NZBC Acceptable Solution E2/AS1 paragraph 1.1.
- Constructed with timber framing complying with the NZBC.
- Situated in specific design wind pressures up to a maximum design differential ultimate limit state (ULS) of 2.5 kPa.
BGC Durabarrier™ Rigid Sheathing/Air Barrier has also been appraised for use as wall bracing systems for timber-framed buildings within the scope of NZS 3604.
Technical literature
- Durabarrier Rigid Sheathing/Air Barrier Installation Manual, April 2019
- BGC Durabarrier Architectural Drawings DB-01 to DB22, August 2018
Consenting instructions
Always refer to the Appraisal in full and the technical literature.