Channel rainwater efficiently
Downpipes
Product Overview
Essential to any roofing system, a downpipe is a vertical pipe that channels rainwater from gutters to the ground or, ideally, a plumbed drainage system.
Roofmart distributes a coordinated range of COLORBOND® and ZINCALUME® steel downpipes and the accessories needed for downpipe installation from Metroll. These include clips, outlets, and gutter guards, as well as sumps and rain heads. Our products are manufactured to meet the challenges of Australia’s climate, to last decades, and to complement any rooftop and architectural aesthetic.
The most popular downpipe choice is the traditional rectangular shape; however, we also supply round downpipes, giving you the ideal solution to suit your architectural style and gutter system.
Common Sizes
- 100mm x 50mm
- 100mm x 75mm
- 90mm round
- Other sizes available
Technical Specifications
Rainwater Goods Data Sheet
Download PDFComplete System
Roofing Sheets
- Roofing sheets in your chosen material and length
- Calculate your requirements based on your roof area plus 10% allowance for wastage
Fixings & Fasteners
- Roofing screws (weather sealed)
- Hex Head Type 17 Screw with EPDM Washers for timber supports
- Allow 8-10 screws per square metre of roof area
Ridge Capping & Flashings
- Ridge capping for rooftop peaks
- Barge flashings for gable ends
- Apron flashings for wall junctions
- Valley gutters for roof valleys
Guttering System
- Quad or fascia gutters (half round or flat back)
- Downpies & brackets
Support Structure
- Purlins/battens (if not existing)
- Appropriate spacing to suit the corrugated profile
IMAGE CREDIT: https://colorbond.com/
Photo by: Matthew Moyes | Built by: Phil Kelleher Homes
DIY Installation
Tools You’ll Need
- Cordless drill with hex bits
- Measuring tape and chalk line
- Metal-cutting circular saw or angle grinder
- Ladder or scaffolding
- Safety equipment (harnesses, anchors, non-slip footwear, eye protection)
Safety First
Installation Overview
IMAGE CREDIT: https://colorbond.com/inspiration/gallery
Builder: Saltbox Building | Designed by Rama Architects
Measure & plan
Calculate how many sheets you need. Mark purlin positions.
Prepare the structure
Install purlins and roof batterns, ensure they are correctly spaced and level.
Add guttering
Complete the rooftop water management system, including downpipes.
Install roofing sheets
Begin at one end, overlap sheets correctly, and maintain straight lines.
Secure sheets
Use the appropriate screws in the correct positions.
Install flashings
Seal all joints and roof penetrations.
Wash down
Thoroughly wash down to clean off swarf (metal shavings)
Frequently Asked Questions
Depending on the local environment, basic maintenance, and the correct installation technique, COLORBOND® guttering can typically last between 25 and 30 years, or longer. It is a durable, robust, and stylish guttering system for both metal and non-metal roofs.
No matter what material they are made from, downpipes must be periodically checked and cleaned to prevent blockages from debris, such as leaf litter, insects, and dirt. Moreover, keeping gutters clean will subsequently help keep downpipes clear.
Downpipes, like gutters and flashings, must be compatible with all “upstream” roofing materials per the Australian National Construction Code. You’ll need to consider not only the aesthetic result you’re looking to achieve in terms of material, colour, shape, etc, but also factors such as rainfall volume and debris volume for our property (e.g. leaf litter falling onto your rooftop). Speak with a friendly member of the Roofmart team for specific guidance and professional advice.
It’s simple! Just get in touch with us to get the ball rolling.