Dimond Box 125 Gutter Profile
All dimensions given are nominal
Effective cross sectional area (with 15mm free board)
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 1/2 hard
|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
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|
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 126.96.36.199, 188.8.131.52, 184.108.40.206, 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 220.127.116.11 of Roofing & Cladding Technical Manual.
- Awareness and implementation of maintenance requirements, particularly for surfaces not washed by natural rainfall. Refer Section 18.104.22.168 Roofing & Cladding Technical Manual.
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.