Box Gutter Sump Design

Low and behold the box gutter is rotted out. 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. 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.

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The issue today is the copper would disappear not counting the cost to reinstall.

Box gutter sump design.

A sump with a high capacity overflow device. Sides must be vertical. Box gutter and rain water head at end of box gutter allowance for vertical faces and catchments on both sides of box gutter. Sizes the depth shown of the box gutter is the depth at the upstream end.

Box gutter design to as 3500 3 2015. 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. Box gutters must be straight no bends. A slate tile roof connecting to the box gutter and then to the copper spouts.

To do this we need 3 things what is the biggest storm we should design for. A a rainhead b a sump with a side overflow device. Or c a sump with a high capacity overflow device. Design a box gutter to an internal sump with a side overflow.

The minimum size of a sump is 400mm x 200mm minimum width of box gutter and 150mm deep. Sumps are to be appropriately sized in accordance with as nzs 3500 3 with a minimum length of 400 mm and when fitted with a high capacity overflow device with a depth of not less than 150 mm when either one or two box gutters enter the sump. Rainheads are an essential design element for buildings where internal box or trough gutters are used. Must have a constant slope between 1 40 and 1 200.

A rainhead or sump is a container located between the gutter and downpipe that aids the flow of water away from the roof. A box gutter is defined 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. Down pipe must be vertical from sump not to the side minimum sump length is 400mm. A sump with a side overflow device.

The old box gutters worked great in the day. Find the design rainfall. The esthetics of the box gutter hid the gutter from sight which was important during that time. Design a box gutter to an internal sump with a vertical overflow.

All of the above options provide overflow provision to the box gutter.

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