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    2016
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Gutter Overflow Options

Gutter Overflow Options

Gutter overflow is an issue that has been hitting our industry hard over the last 12 months, even though it has been a part of the AS/NZS 3500.3 since 1992.

The issue has been that guttering installation has not changed in over 100 years and plumbers simply did not notice the changes, the Plumbing Industry commission (PIC) also did not police the changes. With the change to the Victorian Building Authority (VBA) a lot of the shortcomings of the PIC where beginning to come into focus.

The Residential Metal Roofing Industry Association of Victoria (RMRIAV) engaged all of its members to gage how much of an issue this was in the Victorian building market, they found that this was almost a non-issue.

As the vice chairman of the RMRIAV and with complete agreement from the board we decided that one was too many and we asked our suppliers to find a solution to this problem.

Stramit is the principal partner of Johnson Roofing and we have worked closely with them to be at the forefront of the development of a solution for our customers.

Stramit have developed a four options for solving this issue:

  • Slot area 720mm2/m – Overflow volume 0.3L/s/m. Meaning that the slot area for overflow in a meter of gutter is 720mm square allowing for 0.3 litres of overflow per second per meter.
  • Slot area 1200mm2/m – Overflow volume 0.5L/s/m. Meaning that the slot area for overflow in a meter of gutter is 1200mm square allowing for 0.5 litres of overflow per second per meter.
  • Stramit® Gutter Spacer – Overflow volume 1.2l/s/m. Meaning that the gutter spacer clip allows for 1.2 litres of overflow per second per meter.
  • Stramit BAT® clip – Overflow volume 1.5l/s/m. Meaning that the BAT® spacer clip allows for 1.5 litres of overflow per second per meter.

For all information on these new additions to our offering please see the brochure attached click link then look for Stramit Overflow Options.pdf on the right near the bottom.

Or contact the office to arrange an appointment to discuss the changes.

Warmest regards

Peter Coll
General Manager

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7 COMMENTS

  • Gutter Repairs Adelaide
    08/08/2016, 7:38 pm REPLY

    Great blog, I use some of these options all the time when it comes to dealing with customers roofing and gutter overflowing problems.

  • Gutter Repairs Adelaide
    08/08/2016, 7:38 pm REPLY

    Great blog, I use some of these options all the time when it comes to dealing with customers roofing and gutter overflowing problems.

    • Thank you so much for the feed back, we are finding in different parts of the country that it is becoming standard requirement so just check with your local regulatory body to ensure you are up with their requirements.

      Thanks again,

      Peter Coll

  • Gutter Repairs Adelaide
    15/08/2016, 7:58 pm REPLY

    We usually just install a downpipe pop around 50mm in diameter, and run off into a garden or nearby stormwater if more convenient than a complete gutter replacement.

    • You would think that that would be enough but sadly it wont, all downpipe’s are sized for a 1 in 20-year rain event and all overflow must be sized 1 in 100-year rain event.

      The AS/NZS3500.3 also states that it must be uninterrupted overflow! this has lead to the Australian Steel Industry conducting this testing that has lead to this information.

      Good luck with the implementation in South Australia.

      Regards

      Peter Coll

  • Jayden Pratten
    24/08/2016, 11:39 am REPLY

    Yeah,It is a big issue for roofing and should sort-out this problem at earliest as possible.I am sure the solution will be nice and helpful for the users.Thanks a lot for publishing such an article.

  • Civic Plumbing
    26/10/2016, 9:02 pm REPLY

    Great advice…….. Few points you mentioned above those are really useful, I called <a href="http://www.civicplumbing.net.au/">Civic Plumbing</a> once they take their job seriously and done it well.

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