Integrated cascade drainage system

Integrated cascade drainage system

Controlled dewatering across several roof levels

Our cascade drainage solution provides you with a complete system for the controlled drainage of rainwater across multiple roof levels. It is especially suited to multi-storey buildings featuring roof spaces, balconies, terraces or canopies that are positioned one on top of the other.

Accumulating water does not fall freely onto the surfaces below but is collected via adapters before being directed into a shallow-channel system and drained away in a targeted manner. This creates an enclosed dewatering solution that runs from the upper roof surface to the subsequent dewatering connection point.

How you benefit from our cascade drainage: 
 

• controlled dewatering of precipitation across multiple roof levels  
• water does not spill over onto lower balconies, terraces or canopies
• modular shallow-channel system for individual drainage lines
• installed above the insulation and sealing level
• can be integrated into gravel fills, slab flooring and terrace substructures
• large, rectangular shallow-channel cross section for high flow rate
• screwed connections with wraparound EPDM seal
• channels can be cut to size on site

Why cascade drainage is essential for multilevel roof surfaces 
 

Multilevel roof surfaces place particular demands on dewatering. In order to protect exposed areas such as balconies, roof terraces or canopies, rainwater should not be allowed to simply fall onto the levels below. 
 

Our cascade drainage solution therefore directs rainwater systematically over several levels. The water is collected in a targeted manner before being directed over the roof membrane and fed into the dewatering system at appropriate points.

This results in a controlled flow of water for construction projects featuring several roof and terrace areas arranged one on top of the other. 
 

Systematic direction rather than free-fall drainage 
 

Water enters the system through compatible adapters right at the rainwater pipe. It then passes through connectors and flows into a modular shallow-channel system. The individual elements can be flexibly combined and adjusted to fit the respective installation location. 
 

Changes in direction are created using straight or angled connectors as well as corner connectors. This allows even complicated drainage lines to be laid on the roof surface. The shallow channels run above the actual waterproofing layer without penetrating it.

Due to their low installation height, the channels can be incorporated into various installation locations: into gravel fills, beneath slab flooring or into terrace substructures, for example. 
 

Modern shallow channels for flexible drainage lines 
 

The system is based on stainless-steel shallow channels, designed with a 250 x 40 mm rectangular cross section. Straight channel elements, downpipe mounts, variants incorporating outlet nozzles and sections that feed through parapets and balustrades allow the system to be adapted to the project at hand. 
 

The channels can be cut to length as needed on site. As the shallow channels do not feature fixed brackets, every component can be fully utilised. This makes it easier to fit the components to specific roof geometries, downpipe positions and connection points.

High flow rate without penetrating the sealing level 
 

The shallow channels’ rectangular cross section is designed to be larger than that of a conventional downpipe. This prevents the drainage volume from being curbed and enables efficient channelling of the water. 
 

At the same time, the shallow design enables the channel to be installed above the insulation and sealing layers. The system thus runs over the roof surface without having to penetrate the sealing level.

Securely connected and permanently sealed 
 

A key feature of our cascade drainage solution is its connection technology. The individual elements are joined together using screwable connectors with socket head screws and dummy rivets. 
 

A wraparound EPDM strip is attached at either end to ensure sealing. The seal is pressed between the elements when the components are screwed in place. This creates a watertight connection along the entire drainage line.

Corner designs can also be realised using angled connectors. This reduces the number of required components and connection points while facilitating efficient installation.

Easy installation on the building site 
 

The cascade drainage solution is designed with an eye to its flexible handling on the building site. The channels can be cut to size and adapted to fit the respective location using the connectors. The connectors offer plenty of flexibility here to compensate for tolerance values when cutting the channels to size. 
 

Made from 1.5 mm-thick stainless steel, the system was developed for use in demanding outdoor applications. The combination of modular construction, reliable connection technology and flexible adaptability makes planning and installation a breeze.

Compatible with a range of dewatering solutions 
 

Our cascade drainage solution can also be combined with other dewatering systems from our range of products. On the roof surface, for instance, façade dewatering solutions, gullies or branch channels can be used to initially collect and channel accumulating water. 
 

The water is then led away in a controlled manner via the cascade dewatering solution. At ground level, drainage and dewatering systems can gather the precipitation collected from all roof levels and drain it away. This makes for a coordinated dewatering solution from roof to sewer.