JAS Design

In-house design

JAS has a technical team that will design JAS Siphonic according to your project needs. The heart of our in-house design lies in providing design, technical advice and customized solutions for each project. Our designers will work with you to design a siphonic roof drainage system that will meet your needs and suit your building conditions.

Our 5 core values in JAS Roof Drainage Design

Cost-effective roof drainage system

JAS Siphonic is the most durable and cost-effective roof drainage system in the market. The JAS Siphonic System allows you to reduce the number of downpipes, manholes and underground pipework compared to a gravity system.

Flexibility to create value-added engineering solution

We provide “Freedom & Flexibility” in roof drainage design, so downpipes can be located based on client project requirements.


“Great design is not just a solution, it is the elimination of the problem”, M. Cobanli

The JAS team is very concerned about the optimal design solution to rapidly remove water from your roof making the building safe from overflow problems.


“The materials we use and the way we use them can reduce the environmental impact of construction”

JAS Siphonic Roof Drainage Systems play an important role in reducing the carbon footprint of building projects. Our HDPE Pipe System has a low carbon footprint, high durability and 100% recyclable.


JAS Siphonic System is invented in the UK. Our designs are insured worldwide by LLOYD’S, the world’s leading insurance company.