Dimond Box 125 Gutter

Dimond Box 125 Gutter

Suitable for residential

Suitable for light commercial

Box 125 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 125 Gutter Profile

Designed for heavy rainfall intensity to give maximum flow where fewer downpipes are desired. Traditional box shaped spouting/gutter.

Dimond Box 125 Gutter Profile

Dimond Box 125 Gutter Profile Dimensions

All dimensions given are nominal

Profile Properties

Effective cross sectional area (with 15mm free board)


Flow capacity

112 litres/min

Minimum recommended fall

1:500 (2mm in 1 m)

Minimum downpipe - Circular


Minimum downpipe - Rectangular

min. cross sectional area of 4125mm², smallest dimension at least 50mm

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) 168 134 111 96 84 75 67 56 48 42 37 33

Material options including thickness and grade


0.55mm G300


0.90mm H34


0.55mm 1/2 hard

Stainless Steel

Refer Dimond

Roll-forming facility


Gutter Bracket Material Thickness
Internal Galvanised 1.15mm
External Hot dipped galvanised 3mm x 32mm
External Aluminium 5mm x 30mm
External Brass 3mm x 30mm
External Stainless steel 3mm x 30mm

Recommended bracket maximum spacings

Steel - 900mm spacing (refer to installation section for snow load bracket guide where snow fall is possible)

Aluminium - 450mm internal, 600mm external

Recommended fixings

Screw or nail fastenings to suit substrate

Dimond rainwater disposal systems are available in a variety of materials together with the appropriate brackets and


Material Grade Thickness (mm) Metal Coating Prepaint Finish Available Relevant Standard
Steel G 250/300 0.55 BMT Zinc/Aluminium/Magnesium Yes AS 1397
Aluminium (plain) 5052 / 5251 0.9 BMT N/A No AS 1734
Stainless Steel ​​​445m2​​​ 0.55 N/A No AS 1449
Copper 122A 0.55 N/A No AS 2738

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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