Box Gutter Overflow Design

Making the box gutter wider will also reduce the box gutter depth.

Box gutter overflow design.

A wider overflow needs less depth of overflow hence the box gutter depth will also be reduced. The architect usually specifies the gutter width. This box gutter has a width of 450 mm. However a wider overflow may increase the length of the sump.

The hydraulic capacity of the overflow device must be no less than the design flow for the associated box gutter outlet. This effectively states that all box gutters must allow for 30mm of freeboard which is from the overflow point eg. What are the advantages of modern box gutter design and in what way are they a great investment while renovating or building. The water is drained via downpipe nozzles or via a sumps downpipes built into it.

A good box gutter design will have falls along its length together with sumps to collect water before it is fed into large downpipes. The box gutter depth and the sump length are influenced by the size of the overflow. All domestic box gutters must be a minimum of 200mm wide and 75mm deep. Starting from the determined design flow draw a line up the design graph for sump side overflow device chart in your copy of as nzs 3500 3 2003 until you intersect a width of box gutter curve that matches the specified gutter width.

Have a minimum depth of 75mm at the high end. State of victoria victorian building authority 2017 published june 2017. See more ideas about roof design roof detail box gutter. Rainhead overflow or specific box gutter overflow must be at least 30mm below the height of the back of the box gutter.

The width of the rainhead is to be at least equal to the width of the box gutter and the box gutter needs to be sealed to the rainhead. Have a sole width which is not reduced discharge at the downstream end without. Have a minimum width of 300mm for commercial installations 200mm for domestic installations. 2015 3 7 4 layout.

As a box gutter is usually located above a room or space in a building there is an increased risk that rainwater overflow could cause damage to the building or cause loss of amenity to its occupants. This free online box gutter calculator will calculate the size of box gutters and sumps with a vertical high capacity overflow in accordance with the australian plumbing code as nzs 3500 3 2003 part 3 storm water drainage. Failing to install appropriately designed box gutters and correctly sized and positioned overflow devices can lead to serious damage to buildings and contents especially in shed and flat house roof designs often resulting in hefty insurance claims which are a. Dec 2 2019 explore sophia imran s board box gutter on pinterest.