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All grates for surface drains need to be durable, robust and load rated for service vehicles, cars and trolleys

To ensure long life, products must be carefully selected and installed correctly. An investigation of the application’s location is recommended to identify whether a corrosive environment (e.g. coastal areas, swimming pools) and/or or whether chemicals will be used for cleaning. This affects material choices. Grates are available in a variety of durable materials including cast iron, composites, stainless and galvanised steel.

Grates and their underlying drainage structures must also be designed to withstand trucks, cars and trolleys. Loading refers to any foot or vehicular traffic being applied to the grated trench drain. Load standards are a tool to enable comparison of products by providing an independent measurement scale.

grate loadings

AS 3996 specifies the requirements for access covers and grates for use in vehicular and pedestrian areas. The table opposite shows the recommended individual wheel load for each load class.

Consider the following factors when specifying drainage for urban hardscape areas. Important factors include:

  • Trench and grate material
  • Weight, type and size of wheels
  • Traffic patterns-traffic speed, frequency, braking, turning, etc
  • Edge protection
  • Chemical resistance
  • Installation

To learn more about factors affecting loading, visit ACO’s education pages.

As part of ACO’s continuous product development and commitment to quality, ACO has NATA certified testing equipment (License number 15193), operated by fully trained and certified technicians. ACO grates are load rated to AS 3996 to ensure they withstand the intended traffic for the application. ACO can supply NATA load test reports to AS 3996 and a Certificate of Compliance.

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