CRM are acknowleged as one of the leading authorities in the UK on siphonic drainage, with wide experience of physical testing of siphonic systems, and have sat as invited expert members of the panel for both the US and British Standards on siphonic roof drainage.
Siphonic roof drainage installations are quite complex in function, but can offer dramatic performance improvements over conventional systems. These systems are still bound by the same overall conditions as conventional systems, in that the level of rainfall to be used for any gutter which may spill water into the building when its capacity is reached should be designed using BSEN12056, although the siphonic system itself would be designed to BS8490. CRM carries out pre-tender designs on buildings for a limited cost, commenting on:
- The suitability of the building for a siphonic system.
- Suggested gutter sizes if these have not already been decided upon.
- Designing a suitable rainfall intensity, based on building use and area in the country.
- Putting together a specification and technical data pack to accompany the legal tender documentation.
CRM's lead consulatant in this area, Dr Malcolm Wearing, sat as members of both the UK and American Society of Mechanical Engineers steering groups on siphonic roof drainage standards. CRM have conducted long term researchers into the workings of siphonic systems and thus we can offer a level of expertise only possessed by a limited number of people in the country. Malcolm was responsible for the formation of the Siphonic Roof Drainage Association and still serves as technical consultant.
