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Overflows

Overflows must discharge clear of the building to clearly show that downpipe capacity has been exceeded; it should be an obvious indication that the gutters need maintenance.

The overflow opening of a rainwater head from an external gutter must have a cross-sectional area equal to that of the downpipe. The bottom of the overflow must be no higher than 25 mm below the bottom of the spouting.

Where the position of an outlet of a parapet wall gutter is on an outside wall, any scupper outflow should discharge into a rainwater head.

/cop/roof-drainage/rainwater-heads-sumps-and-overflows#overflows
Revision Category: 
2 - Editing and rearrangement
Revision Detail: 

Clause renamed, Outlets are now discussed under Outlets and Downpipes.

Draft Clause: 
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