Description
A domestic rainwater head (rainhead) dimension detail, drawn as a 3D pictorial to AS/NZS 3500 figure I2, showing how an overflow rainhead is set up at the end of a box gutter. The box gutter discharges into the rainhead over a downpipe, with the front of the rainhead left open above an overflow weir so that a blocked or overloaded downpipe spills clear of the building rather than backing up into the roof – the arrangement the standard requires to protect against box-gutter overflow.
A dimension table defines the box-gutter width and depth and the rainhead width and depth as minimums, and the notes require the rainhead sealed to the gutter and a minimum 1:100 gutter fall. Drop it into a roof-plumbing drawing and enter the dimensions from your drainage design.
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