Downpipe

A vertical pipe conveying rainwater from a roof outlet or gutter down to the drainage system at ground level. Downpipes are made from cast iron, steel, aluminium or plastics, and their number and size are determined by roof catchment area and design rainfall intensity.

Also known as: rainwater pipe, fall pipe, downspout

Related terms

Gutter

A channel that collects rainwater run-off from a roof and conveys it to outlets and downpipes. Gutters may be eaves-mounted, formed as valley or parapet gutters within the roof, or integrated into metal roofing systems, and are sized by rainfall calculation.

Roofing & waterproofingConstructionIndustrial

Rainwater outlet

The drainage fitting through which water leaves a flat roof or gutter into the downpipe system, incorporating a clamped or welded connection to the waterproofing and usually a leaf guard or grating. Outlets are positioned at the low points of the falls, with secondary overflow provision to guard against blockage.

Roofing & waterproofingConstruction

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