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Product Description and Features

These gutters have been designed with a unique curved base which can prevent build-up of water and dirt, allowing the gutter to clean itself with every shower of rain.

  • Half Round gutter is available with external brackets only
  • Flat Back gutter uses internal brackets only
  • Large water carrying capacity gutter with overflow slots in the design, specifically for the tropics. Available unslotted on request
  • Range of easy fix accessories and brackets, makes installation easier


  • Styles and dimensions vary for each state, see availability tables
  • It is important gutters slope towards the outlets (a minimum gutter fall of 1 in 500 is recommended). Without this slope, ‘ponding’ may occur, reducing the life of your gutter
  • When installing gutters, remove any metal particles or debris at the end of the day to prevent staining or corrosion
  • Do not install galvanised gutters with a ZINCALUME® steel or COLORBOND® prepainted steel roof. Galvanised gutters are only suitable with galvanised steel roof
  • The protective plastic film should be stripped off immediately on installation


Sizes & Lengths

Half round gutter is a simple profile, supported by external brackets. Ideal for tropical environments with huge water carrying capacity. Self cleaning with every shower of rain.

Available in 3000mm and 6000mm lengths only, subject to enquiry.

half-round-gutter-schem-def Dimensions
State B(mm) Material
QLD 150 ZINCALUME® steel & COLORBOND® steel
VIC 149 ZINCALUME® steel & COLORBOND® steel
SA 150 ZINCALUME® steel, COLORBOND® steel & GALVABOND® steel
half-round-gutter-schem-def NSW 100, 125, 150, 200, 250, 300 ZINCALUME® steel & COLORBOND® steel
half-round-gutter-schem-def WA   ZINCALUME® steel, COLORBOND® steel, COLORBOND® Stainless steel, COLORBOND® Metallic steel, copper, aluminium and hard zinc.

Flat Back gutter (Available Nth Qld, SA only)

half-round-gutter-schem-def Dimensions
State x(mm) Material
QLD 136 ZINCALUME® steel & COLORBOND® steel
SA 150 ZINCALUME® steel, COLORBOND® steel & GALVABOND® steel

Quarter Round (Available in WA only)



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Designing Roof Drainage

Correct design of a roof drainage system is critical to the waterproofing of a building. This is a task that should only be carried out by a suitably qualified trade professional in accordance with the BCA and Australian Standards.

In the design and detailing of a roof drainage system, consideration must be given to a range of factors such as:

  • rainfall intensity
  • roof catchment area
  • gutter size/capacity
  • gutter fall
  • gutter outlets (sumps, rain heads, nozzles)
  • downpipe size, quantity and placement
  • overflow consideration
  • material selection and
  • jointing

Downpipe Design

The downpipe size and spacing should be determined in accordance with AS/NZ3500.3.2:1998 National plumbing and drainage: Part 3.2: Stormwater drainage – Acceptable solutions.