Box Gutter Sump Design

At this stage plan the connection to the downpipe.

Box gutter sump design. A rainhead or sump is a container located between the gutter and downpipe that aids the flow of water away from the roof. 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. 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. 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.

Layout box gutters must. 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. Overflow box gutters must have independent overflow provision discharging to the atmosphere. A sump with a high capacity overflow device.

Establish the sump location this should be the lowest point in the box gutter. Sumps are attached between a box gutter and a downpipe where they collect stormwater before sending it down the downpipe. Stainless steel galvanized will be soldered not siliconed. The total flow is used to size the sump and overflow.

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. This is a video of a google slides presentation available here https docs. Box gutter with rain water head at end of box gutter. Sumps made in colorbond zincalume will be riveted and silicone.

Rainheads are an essential design element for buildings where internal box or trough gutters are used. Outlets box gutter outlets must discharge through either a rainhead or sump. Or c a sump with a high capacity overflow device. A a rainhead b a sump with a side overflow device.

Safe trays are useful in a variety of building applications. 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. All of the above options provide overflow provision to the box gutter. 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.