Siphonic Roof Drainage Association

Hdpe can be connected using either electrofusion couplings which are heated by internal elements or by butt jointing where the cut ends of the pipe are melted and then forced together under pressure to make a joint.

Siphonic roof drainage association.

The srda promotes a wider understanding of the principles of siphonic drainage encourages best practice by suppliers and installers and provides a recognised platform for specifiers. Siphonic systems run at higher capacity and higher velocity that a gravity system because the water collected from individual roof outlets is literally sucked along the collector pipe suspended in the space about 1 metre below the roof membrane or gutter sole level. Adequate difference in height of at least four metres between the roof and the buried drains. The srda promotes a wider understanding of the principles of siphonic drainage encourages best practice by suppliers and installers and provides a recognised platform for specifiers.

The water is sucked or siphoned from the roof down into the drain at high velocity. Developed by two engineers in finland siphonic roof drainage made its first appearance in europe in 1968. Materials the majority of siphonic drainage systems in the uk use high density polyethylene hdpe pipework. Siphonic roof drainage association how it works.

Siphonic drainage systems can be used to drain a roof if the following criteria are met. Drainage of large roof surfaces requiring a minimum outflow capacity of 1 0 l s.