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How to choose Grating

Here you’ll find some steps you need to go through to ensure you select the correct Pit and Grate combination.


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Size

Generally when ‘talking grates’ we refer to the clear opening. The clear opening is the internal size of the grate that generally matches the pit or channel underneath and is the size that the water travels through.

  • If using a precast GRC pit or channel, determine the size of this and you’ll find a grate to suit.
  • If you are going to form a channel or pit on site, it’s important you choose a grate prior to beginning this work to ensure there is something off the shelf. Of course, we can manufacture a custom grate; however the price difference is great.
  • Ensure you review the product drawings and allow for the overall frame size and a suitable rebate.




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Load rating and the environment

  • Is the grate located in a trafficable area? Even if an area isn’t designed for vehicular traffic, it’s important to bear in mind possible delivery vehicles etc.
  • AS3996 is a standard covering load ratings and is a tool to help you choose the correct grating for your application. For information see the load ratings page on this website.
  • What will the finished surface look like? Does it matter if the grate is galvanised mild steel (silver) or cast iron (black)?
  • Is the area open to pedestrian traffic or a public space? If yes, you might want to consider a heelguard product.
  • Bicycles? Wheelchairs? If either will be used in the area, the width of bar spacing as well as bar direction should be considered.




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Access (Safety and security)

  • Do the contents need to be protected from unauthorised entry?
  • Does access pose a security risk?

A simple boltdown system will deter the opportunistic and keep children out of harm, while patented security bolts suit projects that must restrict access to only a few.