The System

The siphonic roof drainage system is based on the ingenious gravity-induced vacuum principle. Comprising high quality stainless steel siphonic roof outlets, high density polyethylene (HDPE) pipes, fittings and a professional support package, the siphonic roof drainage system allows the complete drainage of a roof without the requirement of a slope in the pipework, thus saving valuable space, set-up time and money.

The siphonic roof drainage system has been used worldwide for over 30 years in both the industrial and commercial sectors. This includes flat (concrete deck) roofs and any form of roof shape, which drains into a box gutter or eave gutter. Some siphonic roof drainage applications include:

• Factories
• Warehouses
• Shopping centres
• Office buildings
• Apartment buildings
• Airports
• Sporting facilities
• Multi-storey carpark decks
• Renovations of existing drainage systems

The innovative component of the siphonic roof drainage system is the specially designed roof outlet which controls the pattern of discharge, preventing air from entering the pipework. By minimising the intake of air into the system, the water creates a siphoning effect, maximising the suction of the water into the outlet. The discharge capacity can be designed between 1 and 100 litres per second (l/s) per roof outlet. More detailed information and the principles of siphonic roof drainage can be found in the FAQ section.


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