COP v3.0:revision-history; 2019-december

19.1 2019 – December 

The following updates to the NZ Metal Roof and Wall Cladding Code Practice (COP), are effective 1 December 2019.

Major Revisions

  1. For this update, the COP section 5 Roof Drainage and all its sub-clauses have been substantially revised. The updates focussed heavily on creating new online tools for calculating Roof Drainage, Gutter Capacity, Downpipe Capacity and Valley Capacity, which are located in 5.7 Capacity Calculations.

Summary of other changes in this update

19.1A Revision Detail - 2019 - December

CategoryClause Number (at time of update)Clause (As of current publication)Details
2 - Editing and rearrangement11 IntroductionUpdate Revisions Message
2 - Editing and rearrangement2.12.1 DefinitionsRevised definition of "Load Spreading Washer", added a new item "Profiled Washer", added definition for "Finial",  minor grammatical fixes.
2 - Editing and rearrangement55 Roof Drainage The entire Roof Drainage-clause had been revised.
1 - Minor Errata5.15.1 NZBC: Clause E1 — Surface WaterFormatting
4 - Clause Inserted 5.2 Types of GutterNew clause.
4 - Clause Inserted 5.2.1 External Gutters (Spouting)New clause.
2 - Editing and rearrangement5.5.55.2.2 Concealed Fascia GuttersThis clause had been completely revised and renamed.
2 - Editing and rearrangement5.5.45.2.3 Internal GuttersClause completely revised.
4 - Clause Inserted 5.2.3.1 Internal Gutter Design FeaturesNew clause.
2 - Editing and rearrangement5.65.2.4 Valleys  Valleys had been completely revised and divided into smaller, more specific, sections.
4 - Clause Inserted 5.2.4.1 Valley FixingNew clause.
4 - Clause Inserted 5.2.4.2 Valley DesignNew clause.
4 - Clause Inserted 5.2.4.3 Internal CornersNew clause.
2 - Editing and rearrangement5.6.25.2.4.4 Bifurcated ValleysThe clause had been revised. Valleys are now discussed in smaller, more specific, clauses.
4 - Clause Inserted 5.2.4.5 Changing Angles in ValleysNew clause.
4 - Clause Inserted 5.2.4.6 Asymmetrical ValleysNew clause.
4 - Clause Inserted 5.2.5 Roof GuttersNew clause.
3 - Substantial change to recommendation5.5.75.2.6 Secret GuttersClause revised, for brevity and clarity.
4 - Clause Inserted 5.3 Rainwater Heads, Sumps, and OverflowsNew clause.
2 - Editing and rearrangement5.8.15.3.1 Rainwater HeadsClause revised, now providing more information.
2 - Editing and rearrangement5.85.3.2 SumpsThis clause has been revised.
2 - Editing and rearrangement5.8.25.3.3 OverflowsClause renamed, Outlets are now discussed under Outlets and Downpipes.
4 - Clause Inserted 5.4 Outlets and DownpipesNew clause.
4 - Clause Inserted 5.4.1 Placement of DownpipesNew clause.
4 - Clause Inserted 5.4.2 Capacity Table for Common Size DownpipesNew clause.
2 - Editing and rearrangement5.5.15.5 Gutter Installation and MaintenanceClause has been revised and edited.
4 - Clause Inserted 5.5.1 Maximum Gutter LengthNew clause.
2 - Editing and rearrangement5.5.25.5.2 Gutter Support SystemsClause revised.
4 - Clause Inserted 5.5.3 Gutter MaintenanceNew clause.
2 - Editing and rearrangement5.25.6 Roof Drainage DesignClause had been completely revised.
2 - Editing and rearrangement5.3.15.6.1 Catchment AreaCaluse has been completely revised. All calculations are now under a new clause Capacity Calculations.
2 - Editing and rearrangement5.5.85.6.2 Gutter FallClause revised and renamed.
3 - Substantial change to recommendation5.35.6.3 Rainfall IntensityClause had been completely revised, with updated Rainfall Intensity Maps at the end of the main Clause, Roof Drainage. 
4 - Clause Inserted 5.6.3.1.1 Allowance for Short-Term IntensitiesNew clause.
4 - Clause Inserted 5.6.3.1 DurationNew clause
2 - Editing and rearrangement5.3.25.7 Capacity CalculationsThe old clause, Capacity Calculations, replaced by a new clause of the same name but including new online tools.
4 - Clause Inserted 5.7.1 North Island 50-year ARI, 10-minute Rainfall Intensity MapNew clause.
4 - Clause Inserted 5.7.2 South Island 50-year ARI, 10-minute Rainfall Intensity MapNew clause.
4 - Clause Inserted8.38.3 Flashing CoverAdjusted spacing in Table 8.3A
2 - Editing and rearrangement8.4.4.38.4.4.3 Step ApronRemoved reference to "Fortress Fasteners" in drawing A:  Step Apron Details.
4 - Clause Inserted8.4.4.48.4.4.4 Eaves FlashingDrawing 8.4.4.4A renamed to Gutter Flashing.
2 - Editing and rearrangement12.212.2 Purlin CreasingInserted photograph.
4 - Clause Inserted17.1.217.1.2 Point Load Testing StandardNew Clause.
4 - Clause Inserted17.3.217.3.2 Point Load TestingNew clause.
1 - Minor Errata18.818.8 Sheet Metal Work For Roofing Contractors.Clause revised for gender neutrality. No significant changes.
4 - Clause Inserted 19.1 2019 – DecemberSummary of Changes – December 2019
0 - Clause Removed5.3.2.1Method 1: Gutter and Downpipe Capacity Determined by GraphThese methods have been replaced by online capacity calculating tools.
0 - Clause Removed5.3.2.3Method 2: Gutter and Downpipe Capacity Determined by CalculationsThese methods have been replaced by online capacity calculating tools.
0 - Clause Removed5.3.3Roof Cladding CapacityThese methods have been replaced by online capacity calculating tools.
0 - Clause Removed5.4SnowClause removed, Snow and hail are comprehensively discussed in Snow Loads.
0 - Clause Removed5.4.1HailClause removed. Leaf guards and maintenance are discussed under Gutter Maintenance.
0 - Clause Removed5.5GuttersThe clause had been removed. Gutters are now discussed in more detail in a separate clause for each type, under the main clause Types of Gutter.
0 - Clause Removed5.5.3Eaves GuttersClause deleted. Now discussed under External Gutters.
0 - Clause Removed5.6.1Valley CatchmentThis clause had been replaced with the newly developed online tool in Valley Capacity Calculations.
0 - Clause Removed5.7DownpipesInformation previously contained in this clause is now discussed in Outlets and Downpipes.
Out-of-band updates 16/12/2019
2 - Editing and rearrangement5.4.2A5.4.2A Downpipe Capacity TableRemoved obsolete column for Roof Area Drained as the online calculator replaces this.
2 - Editing and rearrangement5.75.7 Capacity CalculationsAdded link to Common Sized Downpipes.