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Siphonic Drainage Regulations

Stay Compliant with the Latest Siphonic Drainage Regulations

Siphonic Drainage System

Recent updates to UK Building Regulations and the BS EN 12056 standards have reinforced the need for robust, efficient rainwater management — particularly for large-scale commercial and industrial properties. These changes place greater emphasis on the design and performance of siphonic drainage systems, ensuring they not only cope with increasingly unpredictable weather patterns but also meet stricter safety and compliance criteria.

At RMLFS, we specialise in helping commercial property owners, developers and facilities managers understand and adapt to these evolving requirements. Whether you’re planning a new roofing project or upgrading existing systems, our expert team ensures your rainwater drainage is designed for maximum efficiency, fully compliant with current regulations, and built to stand the test of time.

From initial surveys and system design to installation and ongoing maintenance, we provide a complete, end-to-end service — giving you peace of mind that your property is protected, compliant and future-ready.

The latest regulations focus on

  • Improved design calculations using accredited software
  • Correct system sizing to prevent blockages and backflow
  • Access and maintenance requirements

  • Mandatory checks for ageing or non-compliant systems in refurbishments and extensions

  • Non-compliance can result in significant liability during heavy rainfall events, leading to water ingress, property damage, and insurance issues.

Commercial Bird Netting Solutions

How RMLFS Can Help

As a leading commercial roofing contractor, we offer a full-service solution to help clients upgrade and maintain compliant siphonic drainage systems

  • Full System Surveys We carry out detailed inspections of your current siphonic drainage, identifying any regulatory or performance issues.
  • Design & Specification Our experts design or re-specify systems in line with updated standards, using industry-leading hydraulic modelling software.
  • Installation & Upgrades Whether it’s a full replacement or targeted upgrades, our experienced teams work efficiently with minimal disruption to your operations.
  • Ongoing Maintenance & Reporting We offer planned maintenance and reporting to keep your system operating at peak performance and ensure ongoing compliance.

Let’s work on your project together

Why Choose RMLFS?

With over 20 years of experience in commercial roofing and drainage, RMLFS brings unrivalled expertise to every project. Our fully qualified teams stay up to date with the latest regulatory changes, ensuring your systems are not only compliant but built to perform. We work seamlessly alongside architects, M&E consultants, and facilities teams to deliver fully integrated solutions that meet your project’s specific needs.

Some of our recent projects

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