Your Expert in Siphonic Drainage
By providing many of the largest architecture firms and construction partners across Ireland and the UK with siphonic drainage solutions, our reputation has grown in this specialist area. And you can trust us to deliver a complete end-to-end siphonic rainwater drainage solution customised to your project.
From design to supply and install to maintenance, we’ll work with you and your team from start to finish. Keep in mind that all our siphonic systems are designed by our in-house design team, in full compliance with BS EN 12056 -3:2000 & BS EN 8490:2007. Our teams are also trained, certified, and experienced in the design and installation of leading brands including Valsir Rainplus®, Terrain Hydromax®, and Blucher® Stainless Steel Siphonic Systems.
Capcon are the Siphonic Specialists
Expertise and Track record
Excellence in design and production
We understand the value of bespoke design and use best-practice design technologies including BIM and 2D to deliver truly design -focused work. Our prefabrication facility means we pre-fabricate pipework systems off-site, in factory-controlled conditions, ensuring precision, accuracy and reducing waste significantly.
Installation and Support
With trained, certified, and experienced teams completing customised installation of all pipework on your project, your project will be in safe hands with Capcon. We can also offer a range of maintenance options includes planned preventative measures, specific repairs and survey services as well as emergency call-outs where necessary.

What is Siphonic drainage?
Siphonic Drainage is a bespoke, engineered solution that utilises the power of a vertical-induced vacuum to create an efficient, high-velocity roof drainage solution.
The system was originally developed in Scandinavia in the 1960s, and has been in use in the UK and Ireland since the early 1990’s.
- Pipes run horizontally within building envelope
- Reduces underground drainage requirements
- Up to 45% cost saving overall
- Exceptionally accurate design software
- Easy routing of rainwater from roof to desired discharge location, making system an ideal partner for rainwater harvesting
Offering a range of key advantages, it is seen by many as the most significant innovation in construction roofing technology within the last 25 years. From its high performance and space-saving properties to its capability to reduce infrastructure and plumbing maintenance, siphonic drainage can offer your projects so much. Architects also prefer it thanks to its renowned flexibility in design and capacity for eco sustainability.
We also specialise in hybrid siphonic-gravity drainage solutions.
Siphonic Drainage Experts
Meet Donnacha Tobin
Find out how we can design and supply a bespoke siphonic drainage solution for your next project by speaking directly with our Divisional Director.
