Half Round Gutter

Dimond 150 Half Round Gutter

Suitable for residential

Suitable for light commercial

150 Half Round Gutter is manufactured in Christchurch.

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Dimond 150 Half Round Gutter Profile

The 150 Half Round is an excellent finishing touch for any home. Manufactured in Christchurch for the South Island, the 150 Half Round is perfect for the classic kiwi home through to a unique architectural design.

Dimond 150 Half Round Gutter Profile

Dimond 150 Half Round Gutter Profile Dimensions

all dimensions given are nominal

Effective cross sectional area (with 10mm free board)


Flow capacity

100 litres/min

Minimum recommended fall

1:500 (2mm in 1m)

Minimum downpipe - circular


Catchment area per downpipe based on the above flow capacity is given in the following table.

Rainfall intensity (mm/hr) 40 50 60 70 80 90 100 120 140 160 180 200
Catchment area per downpipe (m²) 150 120 100 85 75 66 60 50 43 37 33 30

Material options including thickness and grade


0.55mm G300


0.55mm 1/2 hard

Roll-forming facility


*Only available in the South Island

Bracket Material Thickness
External Aluminium 4mm x 30mm

Recommended maximum spacings

900mm spacing (refer snow fall instructions for spacings where snow fall is possible)

Recommended fixings

Screw or nail fastenings to be compatible with substrate and bracket material avoiding dissimilar metal contact.

Scope of Use

Dimond Rainwater Disposal Systems are intended to collect and channel water that runs off a roof. It is intended that the metal gutters be placed at the perimeter of the building, and not in an internal situation.
Use of the products is 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 gutter and bracket material and fasteners must be based on the life expectancy required and the severity of the external and internal environments. Refer Sections,,, 2.2.3 of Roofing & Cladding Technical Manual.
  • Site storage that keeps the product dry and protected from damage.
  • Product handling that prevents surface damage.
  • Correct installation of the brackets and gutter.
  • Allowance for thermal expansion and contraction.
  • Sufficient fall to permit complete surface water drainage, allowing the gutter to completely dry out and not hold water.
  • Control of allowable contact with dissimilar materials. Refer Section of Roofing & Cladding Technical Manual.
  • Awareness and implementation of maintenance requirements, particularly for surfaces not washed by natural rainfall. Refer Section Roofing & Cladding Technical Manual.

NZBC Compliance

Test information available from Pacific Coil Coaters and BHP NZ Steel, and past history of rainwater products, indicate that provided the product use and maintenance is in line with the guidelines contained in the current literature referenced, Dimond Rainwater Disposal Systems can be expected to meet the performance criteria in Clause E2 of the New Zealand Building Code, for a period of not less than 5 years.

Use Outside the Stated Guidelines

If the need arises to use Dimond Rainwater Disposal Systems outside the limitations and procedures given in this or other referenced literature, or, if any doubt exists on product handling or use, written approval for use must be obtained from Dimond, before the project commences.

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