In victoria the installation of box gutters is regulated plumbing work that must be carried out and certified by suitably registered licensed plumbers.
Vba box gutter design.
Which some practitioners have not realised.
Box gutter design compliance box gutters are an essential part of the roof drainage system.
The total flow is used to size the sump and overflow.
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The vba has a number of documents on their website that gives more details on roof drainage and box gutters.
Overflow provision for box gutters home vba.
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The side with the maximum flow is used to size the box gutter.
Plumbers must install the box gutter system in accordance with as nzs 3500 3 as nzs 3500 5 hb 114 and hb 39.
They are simply described on the vba s box gutter design fact sheet as a graded channel generally of a rectangular shape for the conveyance of rainwater within the building footprint including adjacent to a wall or parapet.
In my last article i discussed the emergence of the issue of provision for overflow in external eaves gutters or more specifically the lack of provision for overflow.
This has become a big issue in the past few months particularly in victoria and is going to be a new section in the upcoming.
Box gutter with sump and side overflow.
Downpipe eaves gutter long straight eaves gutters box gutter to rain water head box gutter vertical faces box gutter side o flow box gutter vertical o flow storm water pipe size storm water network overland flow path spitter upstream end custom rain water head.
Compliant box gutters require architects designers builders and plumbers to work together too often the vba finds box gutters installed that aren t the right size don t terminate correctly or have other problems that make them non compliant.
Overflow provisions for gutters here box gutter design click here hia will also develop further information on the new plumbing regulations as more information becomes available.
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This free online box gutter calculator will calculate the size of box gutters and sumps with a side overflow in accordance with the australian plumbing code as nzs 3500 3 2003 part 3 storm water drainage.
Built in gutter design and detailing.
The vba guidance in this fact sheet is based on.
The builder has told us the gutters are compliant but others have told us the bca requires downpipes to be no more than 12 metres apart.
Overflow provision for box gutters october 2014 the vba has identified several instances of plumbing practitioners failing to install appropriate overflow provision in box gutters and rainheads.
Plumbers are reminded that roof drainage systems need to be designed and installed with appropriate overflow provision.
