Combine Elegance and Strength with Kāhu Cladding

Kāhu is a high strength steel external wall cladding system designed to add elegance, strength and style to residential and commercial projects.

The system can be laid horizontally or vertically and features high ribs combined with a symmetrical profile for strength and rigidity. When installed vertically as a wall cladding, Kāhu may be direct-fixed up to a risk score of 12 when risk calculation relies on the E2/AS1 risk matrix methodology.

Kāhu has a double capillary overlap which provides greater weather performance. For wall cladding applications, the exposed capillary groove on the overlap can be omitted, providing a smoother appearance.

The grade of steel used to fabricate Kāhu has been manufactured in accordance with AS 1397-2001 and meets B1 and B2 of the NZBC. Kāhu steel is non-combustible meeting C3.4(a), C3.5, C3.7(a) of the NZBC. In addition, the wall cladding system meets E2/AS1 of the NZBC.

Since being launched, the Kāhu external wall cladding system has been installed in a range of residential and commercial projects including for high-performance cladding at Lemonwood Grove School in Christchurch. In the school's design, the ribs create strong defined shadow lines and the double capillary barrier provides exceptional weather performance, while the chosen colour palette reflects the school's identity.

Kāhu is available in a sheet width of 950mm and a cover width of 875mm. The system is available in Colorsteel Endura and Colorsteel Maxx in a range of colour options — from subtle blacks, greys, browns and whites, through to eye-catching reds and greens.

The system has been load span tested to AS/NZS 1170.2 at the Metal Rollformers Manufacturers Associations testing facility in Huntly, New Zealand.

Kāhu Roofing and Cladding System

Metalcraft Roofing

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Kāhu® is a steel roofing and external wall cladding system comprised of a long run steel sheet with a symmetrical profile, along with associated design and installation information.

Metalcraft Roofing supply the Kāhu® system as a horizontal and vertical external wall cladding, and for roofs with a defined minimum pitch of 3 degrees for use on commercial and residential buildings within the following scope:

Location:

In wind zones:
- Up to and including Extra High as defined by NZS-3604:2011
- Subject to specific engineering, if the engineer has satisfied themselves that the product, pitch and fixings will meet the conditions
In all climate zones as defined by NZS-3604:2011, subject to the limitations set out below
On buildings located within 1m of the relevant boundary, in respect of fire spread only

Up to and including Extra High as defined by NZS-3604:2011
Subject to specific engineering, if the engineer has satisfied themselves that the product, pitch and fixings will meet the conditions

Building;

On new buildings that have been designed and constructed to comply with the NZ Building Code (NZBC) using timber or steel framing
On existing buildings using timber and steel framing where the designer and installer have satisfied themselves that the building is suitable for the intended building work
In conjunction with a vapour permeable building wrap that has a permeability of 36g/m2/day of a vapour resistance of no more than 500MNs/g
Can be used in conjunction with a potable water collection system

3°

Corrosion Exposure Zone D

Extra High Wind Zone

Specific Design Wind Zone

If designed, installed and maintained in accordance with all Metalcraft Roofing requirements, the Kāhu® Roofing and External Cladding system will comply with or contribute to compliance with the following provisions of the New Zealand Building Code:

B1 Structure: B1.3.1, B1.3.2, B1.3.3 (a, b, c, d, g, i)
B2 Durability: B2.3.1 (b)
C3 Fire Affecting Areas Beyond the Fire Source: C3.4(a), C3.5, C3.7 (a)
E2 External Moisture: E2.3.1, E2.3.2, E2.3.7 (a-c)
F2 Hazardous Building Materials: F2.3.1

See product technical statement for full information.

Structure

Durability

Protection from Fire

External Moisture

Hazardous Building Materials

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