Minimum Pitch: 3 degrees (approx. 1:20)

Dimond long run metal roofing and cladding is intended for use in constructing the building envelope for commercial buildings and residential buildings subject to the limitations listed below.

Attention to the following details is required to ensure the expected system performance is achieved:

• The selection of the type and grade of sheeting material and fasteners must be based on the life expectancy required and the severity of the external and internal environments.
• Correct choice of breather type or vapour barrier underlay to suit the building environment.
• Site storage that keeps product dry and protected from damage.
• Sheeting handling that prevents surface damage.
• Avoidance of excessive spans or insufficient fasteners for the expected loads.
• Correct placement and flashing of penetrations through the roof.
• Correct layout and installation of the sheeting, underlay and netting.
• Allowance for thermal expansion and contraction.
• Sufficient roof pitch to permit complete surface water drainage.
• Control of allowable contact with dissimilar materials.
• Awareness and implementation of maintenance requirements, particularly for surfaces not washed by natural rainfall.
• Correct choice of material for collection of drinking water from a Zincalume or colour finished roof is required.

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Test information available from Pacific Coilcoaters and BHP NZ Steel, and past history of use of long run metal roofing and cladding products in New Zealand indicate that, provided the product use and maintenance is in line with the guidelines contained in the current literature referenced, Dimond long run metal roofing & wall cladding systems can be expected to meet the performance criteria in clause B2 and E2 of the New Zealand Building Code, for a period of not less than 15 years.

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