Dimond Box 175 Gutter

Dimond Box 175 Gutter

Suitable for light commercial

Suitable for commercial

Box 175 Gutter is manufactured in Hamilton and Christchurch.

If this product is not suitable for your project... Click here to find product options suitable for your requirements.

Dimond Box 175 Gutter Profile

For extreme conditions where a bold look is desired. Box 175 allows rainwater or snow to be drained quickly because of its large size it is also easy to clean out.

Dimond Box 175 Gutter Profile

Dimond Box 175 Gutter Profile Dimensions

All dimensions given are nominal

Effective cross sectional area (with 15mm free board)


Flow capacity

363 litres/min

Minimum recommended fall

1:500 (2mm in 1m)

Minimum downpipe - Circular


Minimum downpipe - Rectangular

min. cross sectional area of 10,600mm²

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) 545 435 360 310 270 240 220 180 155 135 120 110

Material options including thickness and grade


0.55mm G300


0.90mm H34 offered in folded shape only

Stainless steel

refer Dimond

Roll-forming facility

Hamilton (all Dimond branches can fold gutter shapes1)

1 internal brackets are not recommended with folded gutter without a 4mm diameter aluminium rivet fixing through the gutter and bracket, it is better to use external brackets.

Bracket Material Thickness
Internal² Galvsteel 1.55mm
External Hot dipped galvanised 5mm x 30mm
External Aluminium 7mm x 30mm
External Stainless steel 5mm x 30mm

2 Internal brackets are not recommended for use in areas that are subject to snow fall and/or wind above medium velocity (as determined by NZS 3604)

Recommended maximum spacings

Steel 900mm (refer to installation section for snow bracket guide for recommended spacings where snow fall is possible)

Contact Dimond to discuss Aluminium options

Recommended fixings

Bolt, screw or nail fastenings to be compatible with substrate and bracket material

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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