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Responsibility and Liability

There is a joint responsibility between all the parties to ensure compliance with the terms of the warranty.

The designer, manufacturer, contractor, roofing contractor, and the owner should be made aware of their responsibilities, and all parties are considered to have been informed of their obligation if they have sighted or signed a warranty.

If the requirements of the NZBC or consumer legislation knowingly cannot be met, or if the conditions of the warranty or the requirements are knowingly impractical or ignored, the liability remains with those who ignored them. There is an implied warranty requirement within the Building Act that the material selected and used will be suitable for purpose. The material can be used without compliance with the NZBC, but only on a written statement to that effect given by the roofing contractor and with the consent of the T.A.

Metallically Coated Cladding Endurance and Naturally Washed Cladding Endurance give an indication of the period that metal roof and wall cladding will not perforate from corrosion in a well-washed situation providing maintenance requirements are met. See Maintenance (NZBC: C. Maintenance)


In unwashed areas the durability of wall cladding, spouting or flashings are likely to be less than that indicated in the tables.

Metallically Coated Cladding Endurance and Naturally Washed Cladding Endurance do not necessarily consider the aesthetic appearance of the metal coating or the 'life to first maintenance '. See Repainting Painted Claddings.

The indication for rainwater goods depends on the environment and the ability of any spouting or gutter to be able to drain and avoid ponding.

The COP strongly recommends an enquiry into the terms and conditions of an expected warranty before finalising material selection and issuing tender documents, as Metallically Coated Cladding Endurance and Naturally Washed Cladding Endurance are not warranties.

The range in years provides for differences in each environmental category as described in Environmental Categories.

 
COP Category B — Moderate Inland.
COP Category C — Moderate Marine
COP Category D —Severe Marine
COP Category E — Very Severe Marine

 

Important: Check with supplier as materials used in these areas may not satisfy the durability
requirements of the NZBC.

R/W = Roof and walls

RGS = Rain-water Goods

 

 

Metallically Coated Cladding Endurance

INDICATIVE PERFORMANCE IN YEARS THAT NATURALLY WASHED METALLIC COATED STEEL BASED CLADDING WILL NOT PERFORATE FROM CORROSION.

Environmental CategoryB/C D E B/C DE
CoatingR/WR/WR/WRGSRGSRGS
Galvanised Z450
AZ 150
Prepainted AZ150
Prepainted AZ200
15/30
15/40
30/40
30/50


15/25
20/40



15

10
10/15
12/15


10
10



(optional caption)

 

Naturally Washed Cladding Endurance

INDICATIVE PERFORMANCE IN YEARS THAT NATURALLY WASHED METAL CLADDING WILL NOT PERFORATE FROM CORROSION.

Environmental CategoryB/C D E B/C D E B/C D E
CoatingRoofRoofRoofWallWallWallRGSRGSRGS
Unpainted aluminium
Polyester/Acrylic Aluminium
PVF2 Aluminium
Zinc
Copper
Stainless steel
25/40
30/50
35/50
>50
>50
>50
20/30
25/50
30/50
>50
>50
>50
15/25
20/40
25/40
50
>50
>50
15/40
25/45
30/45
>50
>50
>50
15/30
20/40
25/40
>50
>50
>50
10/20
15/35
20/35
50
>50
>50
10
15
15
10
>50
>50
10
15
15
10
>50
>50
5
10
10
10
>50
>50
(optional caption)

 

Clause: 
016_009_003_000_000_000_000_000_000
Clause Number: 
16.9.3
/cop/maintenance/material-selection#responsibility-and-liability
Revision Category: 
0 - Clause Removed
Revision Detail: 

This clause was removed during an overall revision of Maintenance.

Draft Clause: 
015_009_003_000_000_000_000_000_000