Box Gutter Sump Design

With building design being so restrictive on space these days this is the area where designers must think about how the roofing contractor will make the box gutter comply.

Box gutter sump design.

How to design box gutters to the australian plumbing code as nzs 3500 3 2015. The side with the maximum flow is used to size the box gutter. Refer to hints for box gutter design marking and cutting the sump spigot mark cut sump hole dress the cut out to neatly fit to the sump decide on the position of the spigot mark and cut the hole. Rainheads are an essential design element for buildings where internal box or trough gutters are used.

Each box gutter run must discharge independently to ether a sump or directly out of the building without changing the size of the gutter or changing direction. Outlets box gutter outlets must discharge through either a rainhead or sump. Simplified suitable for flattish roofs with little or no vertical faces or steep roofs draining to one side of box gutter only or any roof if you are in a hurry and make the necessary allowances for all catchments. At this stage plan the connection to the downpipe.

All of the above options provide overflow provision to the box gutter. Establish the sump location this should be the lowest point in the box gutter. The hydraulic capacity of these overflow devices must not be less than the design flow for the associated gutter outlet and must discharge to the atmosphere. Support the entire weight of the gutter and sumps when full of water as well as a trafficable load at any point in the gutter and sumps.

A rainhead or sump is a container located between the gutter and downpipe that aids the flow of water away from the roof. To avoid problems plumbers need to calculate the hydraulic capacity of a box gutter and when designing overflow devices consider whether the discharge of the box gutter is to. Sumps are attached between a box gutter and a downpipe where they collect stormwater before sending it down the downpipe. A a rainhead b a sump with a side overflow device.

The total flow is used to size the sump and overflow. Overflow box gutters must have independent overflow provision discharging to the atmosphere. Box gutter with rain water head at end of box gutter. Or c a sump with a high capacity overflow device.

Sumps made in colorbond zincalume will be riveted and silicone. A sump with a high capacity overflow device. This is a video of a google slides presentation available here https docs. Safe trays are useful in a variety of building applications.