The growing flood risk and why all blue roof systems are not the same

While many solutions exist, there has been an evolution in blue roofs, taking the whole concept of stormwater management to a new level. This has led to the launch of the Attenu8 system from Proteus Waterproofing, a uniquely engineered solution, offering a level of security, longevity and performance unparalleled in the market. The Attenu8 system from Proteus Waterproofing is a specialised blue roof solution designed for effective stormwater management on buildings. Its core distinguishing feature is a dual-containment design, which works alongside the company’s patented blue roof system - setting it apart from others on the market.

Conventional blue roof systems typically utilise the main roof waterproofing membrane as the primary and often sole, barrier for temporarily stored water. This means the building’s essential waterproof layer is under constant hydrostatic pressure, directly exposed to retained rainwater for extended periods. While designed to withstand such conditions, this continuous exposure can introduce long-term risks, potentially reducing the lifespan of the membrane and increasing the vulnerability of the building envelope over time. 

This critical difference ensures that the primary roof waterproofing remains dry and unburdened by standing water under normal operating conditions. The blue roof functions by storing any collected rainwater within this dedicated upper reservoir. Within this innovative Attenu8 system, sophisticated, purpose-designed drainage components from a our specialist provider are seamlessly integrated to create an independent attenuation zone. 

This zone acts as a robust, self-contained reservoir, precisely engineered to manage and control rainwater flow. Any water entering this reservoir is carefully held and then released at a pre-determined, controlled rate through a calibrated outflow restrictor. The integrity of this primary containment is handled entirely by the design of the reservoir itself and its integrated drainage components, ensuring water is purposefully managed within this dedicated upper layer. 

The fail-safe barrier

The main waterproofing membrane, which forms the core of the building envelope, therefore serves as an extraordinary, fail-safe secondary barrier. Only in extremely rare and unforeseen circumstances, such as an extreme rainfall event exceeding the system's design capacity or an unlikely blockage within the primary reservoir, would see water rise sufficiently to come into contact with the main waterproof membrane. Even then, that membrane, independently installed and protected, would act as a final, impermeable safeguard, providing an unparalleled layer of security. This unique, two-tiered containment strategy is what truly sets the Attenu8 system apart in the market, offering building owners a level of peace of mind previously unattainable with traditional blue roof technology. It is important to note, however, that regular maintenance, including periodic checks of drainage components, which are usually provided by third party suppliers, still remains a vital part of any blue roof's operational plan.

For additional security, every Attenu8 project is supported by a full design and technical team from project inception to completion. This dedicated support ensures that every Attenu8 installation is optimised for each specific project requirements, taking into account factors such as roof structure, desired attenuation capacity, site conditions and all building regulations. The technical team at Proteus Waterproofing collaborates closely with architects, consultants and contractors to develop bespoke solutions, providing detailed specifications, drawings and performance calculations that guarantee the system meets or exceeds objectives. 

Furthermore, Attenu8 offers flexibility in design and integration. While engineered for high performance, the system can be adapted to various roof configurations and project requirements, integrating seamlessly with other roof elements such as green roof finishes, paving systems, or access walkways. The early engagement with the technical team ensures that these elements are designed correctly from the outset, avoiding conflicts and ensuring optimal performance across the entire roof build-up. This flexibility allows architects greater creative freedom while ensuring critical stormwater management objectives are met.

Attenu8 is also exclusively fitted by licensed contractors who are rigorously trained by Proteus Waterproofing. This controlled installation network ensures that every aspect of the system, from the placement of the independent reservoir components to the integration of the specialised drainage elements, adheres to the highest standards of workmanship. 

Equally as important, the long-term cost-effectiveness of Attenu8 is a significant benefit. While the initial investment in a highly engineered, dual-containment system may appear higher than conventional alternatives, the extended lifespan of the primary membrane, reduced maintenance requirements, mitigated flood risk and enhanced building protection deliver substantial savings over the building's lifecycle. Avoiding costly water damage claims, preventing business interruption and ensuring regulatory compliance also contributes to a lower total cost of ownership.

As increasing climate volatility, extreme weather events, particularly heavy rainfall, become more frequent, Attenu8 provides a robust, engineered response to these conditions, contributing significantly to urban flood resilience and ensuring buildings are protected against the growing threat of water damage. For building owners and insurers, this translates into reduced risk exposure and potentially more favourable insurance terms – because not all blue roofs are the same.