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v25.06 June 2025

    The update to the Code of Practice published on 1 June 2025 focused on clarification and usability.

     

    Important Changes

    We replaced the illustration for Cricket Under-Soaker: Trapezoidal to show the width of the cricket flashing correctly.

    In Profile Closures, we removed a repeated paragraph and added illustrations showing vermin closures, and we removed a statement from Compatibility with Non-Metallic Substances that neither AZ-coated steel nor Aluminium should be used as a flashing embedded in concrete or masonry.

    In Flashing Expansion, we clarified the required moisture content of timber and removed a recommendation for using aluminium rivets in place of expansion joints.

    Other Notable Revisions

    We renamed three clauses: Runoff, Rainwater Heads, Sumps, and Overflows, and Outlets and Downpipes, with no changes to recommendations.

    In another bid to improve clarity and usability, we introduced an interactive table to Lichen And Mould. The table gives improved guidance on water/bleach ratios to achieve a 2% chlorine solution for treating lichen and mould on roofs.

    The rest of the updates and revisions consisted of minor edits for clarity, grammar, and spelling. There were no other changes to recommendations.

    Revision Detail v25.06 - 2025 - June

    CategoryClause Number (prior to update)Clause (As of current publication)Details
    3 - Substantial change to recommendation4.9.3Compatibility with Non-Metallic Substances Removed statement that neither AZ coated steel nor aluminium should be used a a flashing embedded in concerete or masonry.
    3 - Substantial change to recommendation7.1.1Minimum Roof Cladding Pitch Added an exception to Exceptions to the Minimum Recommended Roof Cladding Pitch requirements regarding guidance for Reroofing trough section roofs at less than 3°.
    3 - Substantial change to recommendation8.10.1Flashing Expansion Clarified statement of the required moisture content of timber and removed statement about using aluminium rivets in place of expansion joints.
    3 - Substantial change to recommendation8.10.2Building Expansion Joints Corrected the slope of parapet cap from 10° to 3 – 5° and updated the illustrations to be consistent with the Code of Practice format.
    3 - Substantial change to recommendation16.7.1Lichen And Mould We introduced a new interactive table to assist in diluting Sodium Hypochlorite for use on roofs.
    2 - Editing and rearrangement1Introduction New revision message for v25.03, published on 1 March 2025.
    1 - Minor Errata1.5.2Adjudication Minor typo fix: and to an. No change to recommendations.
    1 - Minor Errata4.3Metal Performance Typo fix in Metal Performance in Acid/Alkaline Environments, updated font in illustration—no changes to recommendations.
    1 - Minor Errata4.4.1Sacrificial Protection Typo fix: zinc-oxide to zinc oxide. No changes to recommendations.
    1 - Minor Errata4.5.2Sea Spray Minor for clarity and a typo fix. No changes to recommendations.
    1 - Minor Errata4.7.1West Coast of the South Island and South Coast of the North Island Edited the clause heading for clarity. No changes to recommendations.
    1 - Minor Errata4.9.4Compatibility Table Typo fix/ Changed prepainted Aluminium to Pre-Painted Aluminium.
    1 - Minor Errata4.10.1Unwashed Areas Edit for style, grammar, clarity, and consistency.
    1 - Minor Errata4.10.2Poultice Corrosion Punctuation fix: eg to e.g., No change to recommendations.
    1 - Minor Errata4.10.3Solar Collectors and Other Roof Mounted Structures Some punctuation and typo fixes. No changes to recommendations.
    1 - Minor Errata4.10.6Capillary Action Removed repeated sentence. No changes to recommendations.
    1 - Minor Errata4.11Inert Catchment Added some labels for clarification to Localised Damage due to Inert Catchment.
    1 - Minor Errata4.14Swarf Staining and Cut Edge Corrosion Grammar Fix. No changes to recommendations.
    1 - Minor Errata4.15Clearances Illustration reformatting. No changes to recommendations.
    1 - Minor Errata4.15.1Ground Clearance Illustration reformatting. No changes to recommendations.
    1 - Minor Errata5.3.2.1Designing for Climate Change Table fomatting for RCP Level Descriptions. No change to content or recommendations.
    1 - Minor Errata5.3.2.3Allowance for Short-Term Intensities Punctuation Fix. No change to content or recommendations.
    1 - Minor Errata5.4Gutters Grammar fix. No change to content or recommendations.
    1 - Minor Errata5.4.1External Gutters (Spouting) Grammar fix.
    1 - Minor Errata5.4.5Internal Gutters Font sizing in Separation of Butyl Gutter and Metal Roofing. No change to content or recommendations.
    1 - Minor Errata5.4.7Gutter Capacity Calculator Typo fix. No change to content or recommendations.
    The enforced minimum remains unchanged at 2.2.
    1 - Minor Errata5.5.2Valley Design Typo fix. No change to content or recommendations.
    1 - Minor Errata5.5.4Intersecting Valleys Font resizing in Correct Valley Intersection and Incorrect Valley Intersection. No change to content or recommendations.
    2 - Editing and rearrangement5.5.5Changing Angles in Valleys Added an illustration showing the details for changing angles or pitch in valleys.
    2 - Editing and rearrangement5.6Outlets The clause was renamed, and some content from Outlets and Downpipes relating to Outlets was moved to this clause. No changes to recommendations.
    2 - Editing and rearrangement5.7Downpipes This clause was renamed, and some content was moved to Rainwater Heads, Sumps, and Overflows. Minor edit for clarity: removed the reference to astragalus. No other changes to content or recommendations.
    2 - Editing and rearrangement5.8.1Maximum Area Above Spreader Calculator Updated casing of labels for consistency
    2 - Editing and rearrangement6External Moisture Overview Minor edit for clarity. No changes to recommendations.
    1 - Minor Errata6.3Related Topics Punctuation fix. No change to content or recommendations.
    2 - Editing and rearrangement7.1.2Runoff Capacity Renamed the clause Runoff for clarity. No changes to recommendations.
    1 - Minor Errata7.1.3Roof Drainage Capacity Font display fixed in Trough Capacity and Penetration Gutters. No other changes to content or recommendations.
    1 - Minor Errata7.3.2Roof Cladding Expansion Provisions Font resized for Favourable Circumstances for Controlling Expansion and Unfavourable Circumstances for Controlling Expansion. No changes to recommendations.
    1 - Minor Errata8.1Flashing Expansion Details Some grammar fixes and removed optional Caption tags from illustrations. No changes to recommendations.
    1 - Minor Errata8.4Flashing Cover Typo fix. No change to content or recommendations.
    1 - Minor Errata8.4.1Apron Upstands Typo fix in Undertray for an Aditional Upstand. No changes to content or recommendations.
    1 - Minor Errata8.4.4Flashing Laps Typo fix. No other changes.
    0 - Clause Removed8.5.2Head Barge/Ridge/Barge JunctionClause removed because it was a double-up. Head-Barge/Ridge/Barge Junction is still available under Ridge – barge Intersections.
    1 - Minor Errata8.5.4Parapet Cappings Typo in title of Parapcap Expansion Provisions and font updates in the other illustrations.
    1 - Minor Errata8.5.5.1Parapet And Apron Capping Terminations Typo fix, changed and to an, and deleted the optional caption tag from illustrations. No other changes.
    1 - Minor Errata8.9Compression Timber Grammar fix. Removed redundant word. No other changes.
    1 - Minor Errata9.5.2.2Mechanical Services Removed Optional Caption tag from below the illustrations.
    1 - Minor Errata9.5.3Flush Penetrations Grammar fix.
    1 - Minor Errata11.6Installing Translucent Sheets Fixed typo and text formatting in Translucent Sheet Stop End. No changes to recommendations.
    4 - Clause Inserted v25.06 June 2025 Revision details for the 1 June 2025 update.
    (optional caption)
    Clause: 
    019_001_000_000_000_000_000_000_000
    Clause Number: 
    19.1
    /cop/revision-history/v2506-june-2025
    Revision Category: 
    4 - Clause Inserted
    Revision Detail: 

    Revision details for the 1 June 2025 update.