NZ Metal Roofing Manufactures has put out an update on the code of practice for metal roofing and cladding.

Update Code of Practice

In a major update, effective 1 November 2022, the Clause 15.5 – previously ‘Insulated Panels’ – has been revised and extended.

The main clause has been renamed 15.5 Warm Roofs, and it now includes sub-clauses dealing with 15.5.1 Insulated Panels, 15.5.2 Composite Systems and 15.5.3 Spray-On Systems.
Other notable updates include:

• Changed recommendations for 5.4.6 Asymmetrical Valleys.
• Changed recommendations for 15.4.7 Standing Seam Roofing Wind Loads to minimise wind noise.
• The performance requirements quoted from 5.1 NZBC: Clause E1 — Surface Water has been expanded to better reflect the intent of NZBC E1 — Surface Water.
• The 3.8B Altitudes for Snow Loading Design was renamed to remove ambiguity.
• Roofing products with adhered absorbent fleece were added to 10.10 Ventilation Pathways.
• 15.4.10.3 Standing Seam Flashing details added to 15.4 Standing Seam Cladding.

The rest of the updates consist of minor edits for clarity and layout.

The Code of Practice is a cited document in E2 and referred to for seeking guidance on flashing and cladding designs.

The COP can be found here – https://www.metalroofing.org.nz/cop