Low and behold the box gutter is rotted out.
Box gutter sump design.
Sides must be vertical.
Down pipe must be vertical from sump not to the side minimum sump length is 400mm.
Design a box gutter to an internal sump with a side overflow.
Box gutter and rain water head at end of box gutter allowance for vertical faces and catchments on both sides of box gutter.
Must have a constant slope between 1 40 and 1 200.
The esthetics of the box gutter hid the gutter from sight which was important during that time.
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.
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.
All of the above options provide overflow provision to the box gutter.
Box gutters must be straight no bends.
To do this we need 3 things what is the biggest storm we should design for.
Or c a sump with a high capacity overflow device.
A sump with a side overflow device.
The issue today is the copper would disappear not counting the cost to reinstall.
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.
A sump with a high capacity overflow device.
Find the design rainfall.
Rainheads are an essential design element for buildings where internal box or trough gutters are used.
Design a box gutter to an internal sump with a vertical overflow.
The minimum size of a sump is 400mm x 200mm minimum width of box gutter and 150mm deep.
Box gutter design to as 3500 3 2015.
A a rainhead b a sump with a side overflow device.
The old box gutters worked great in the day.
A rainhead or sump is a container located between the gutter and downpipe that aids the flow of water away from the roof.