Square and rectangular downpipes

We produce square and rectangular downpipes that are available in many sizes to suit any application for industrial and residential buildings. These downpipes are available in a range of Colorbond® Steel colours, Zincalume®, Galvanised, stainless steel and copper.

Available Colours

The Colorbond® steel colour swatches above have been reproduced to represent actual product colours as accurately as possible. However, we recommend checking your chosen colour against an actual sample of the product before purchasing, as varying light conditions, different screens and limitations of the printing process may affect colour tones.

Rectangular Downpipe Accessories

Additional Information

As a general guide, in non cyclonic areas, for every 1m² of roof area drained, 70mm² of downpipe is required. This calculation is based on the assumption that the maximum rainfall does not exceed 125mm per hour.

It is considered the best practice to drain to different points, using smaller downpipes rather than to one large outlet. Where possible, downpipes should be spaced at not more than 12000mm centres.

Profile BMT (mm) Tensile (MPa) Size A x B (mm) Roof Area Drained (m2) 
downpipe-image-for-graph 0.55 G300 50 x 50* 35
75 x 50 55
75 x 75 80
95 x 45 60
100 x 50 70
100 x 75 105
100 x 100 140
125 x 100 180
150 x 100 210
150 x 150 320
200 x 200 570

*1800mm lengths only

Note: Customised sizes are available upon request.