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BI01 The Importance of Maintenance of Metal Roofing and Walling

Regular cleaning and annual inspections are essential to improve the durability and performance of metal roof and wall cladding.

31 May 2024, Version 1

bi01_the_importance_of_maintenance.pdf

BWLS01 End Spans of Roofing Sheets

Using the load/span fixing patterns in E2/AS1, where reduced end spans are not applied, will still comply with the performance requirements of NZBC B1-Structure.

17 October 2025, Version 1

bwls01_end_spans_of_roofing_sheets.pdf

BU02 Over-Saturation of Underlay

Advice and explanation for underlay failure.

11 November 2025, Version 1

bu02_oversaturation_of_underlay.pdf

 

BSP01 Replacing Secret Fixed Trough Section at a 1° Pitch

Roof replacement with a “like with like” does not require a building consent (Exemptions Guidance for Schedule 1 of the Building Act 2004, Fifth edition August 2020).

Version 2, 4 March 2024

Re-Roofing at 1 Degree.pdf

Bulletin BA01 Required Temper for Aluminium Cladding

The temper and the alloy affect the tensile strength of aluminium cladding, which affects both point load and distributed load performance.

Version 1, 11 February 2025

 

BA01-Required_Temper_for_Aluminium_Cladding.pdf

Bulletin BGC01 Pre-painted Metal Wall-Ground Clearance

Durability, rather than weatherproofness, motivates metal wall-to-ground clearances. Clearances are designed to prevent the build-up of vegetation or debris, which can be corrosive.

Version 1, 29 February 2025

BGC01_Ground_Clearance.pdf

Bulletin BCVW01 Support Spacings on Vertical Wall Cladding

The Code of Practice (COP) can be used to support designs for vertical corrugated cladding at spans greater than 480 mm. 

Version 1, 7 May 2024..

BCVW01 Support Spacings on Corrugate Wall Cladding.pdf

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