Durable stainless steel roof drainage – suitable for all flat roofs

Whether you’re working on a new build or refurbishment project, use RESITRIX® drainage elements for quick and safe installation

Drainage elements for flat-sloped roofs are counted among the most important system supplements as, unlike on pitched roofs, rainwater on flat-sloped roofs cannot be drained using the roof pitch. The large volumes of water can also have an impact on the roof or building statics. Accordingly, the requirements placed on drainage elements and roof ducts are particularly high. This makes it all the more important to plan roof drainage properly. The drainage type and system should be selected as early as possible, as charges incurred due accumulation heights (including emergency drainage) and trailing cable suspensions, particularly on lightweight roofs, are included in the support structure planning costs.

We are more than happy to advise you. Please either simply download our drainage system calculation form, or fill it out directly and email it to Technik-HH@ccm-europe.com.

The RESITRIX® drainage accessories include versatile, corrosion-resistant and acid-resistant stainless steel elements. They already have factory-connected EPDM sleeves made from the self-adhesive RESITRIX® SKW Full Bond. So the waterproof connection to the surface waterproofing solution is made particularly quickly and easily. The range has the right element for every drainage situation.

Our RESITRIX® stainless steel drainage elements – whether they’re for main or emergency drainage, or for new build or refurbishment projects – are the perfect products to supplement our range of extremely durable roof waterproofing membranes.

RESITRIX® drainage

Benefits at a glance

  • Safe installation without any risk of fire due to welding with hot air
  • Simple mounting without any need for special tools
  • Service life that spans decades
  • Stainless steel is insensitive to acids and the cold, and is also extremely heat-resistant
  • Safe complete solution
  • Tested by the TÜV
  • Fire protection in accordance with DIN 18234

Click here to view our drainage elements

General information about flat roof drainage

As a result of climate change, both rainfall intensity and rainfall frequency
are constantly increasing, and this may lead to drainage systems being overwhelmed. Careful planning above all else is particularly important if subsequent damage is to be avoided. “Together, drainage systems and emergency drainage systems must be capable of draining the volume of water expected to fall at the building’s location over the course of a century (r (5,100)) within 5 minutes.” This is precisely why a drainage plan should be created for every property. This plan must include details of the type, number and diameter of drains, as well as the position, dimensions and accumulation height of emergency drainage.

Some of the most important standards that must be observed in this regard are DIN EN 12056, DIN EN 752, DIN 1986-100, DIN 18234-3, the Flat Roof Guidelines and the VDI 3806 standard.

Types of flat roof drainage

A distinction is made between three types of drainage system that are used in roof drainage:

  • Gravity drainage (interior drainage)
  • Vacuum drainage (suction system / interior drainage)
  • Exterior drainage

Gravity drainage is the most common type of drainage. Regulations for the gravity system are set down in DIN EN 12056-3 and DIN 1986-100 in this regard. Depending on the slope situation, gravity drainage systems can be designed as interior or exterior systems. Flat roofs should have a minimum slope of 2% according to the rules and regulations. There should be a roof drain at every low point on a flat roof, and every roof drain should have an emergency overflow. Emergency overflows must be arranged at the outer edges of the roof surfaces so that water can be drained freely. A separate emergency drainage system with accumulation height, which drains water onto the premises freely, is included in the interior drainage channels / grooves.

Cutting development and construction costs

A remarkable cost minimisation approach for new build projects can be found where it is least expected: in the plan for the roof drainage system. Often, people don’t give rainwater drainage a second thought until the very end of the project. Yet, from a financial point of view, considering roof drainage while planning a building with a view to cutting development and construction costs is certainly an idea worth pursuing.

+ General information

General information about flat roof drainage

As a result of climate change, both rainfall intensity and rainfall frequency
are constantly increasing, and this may lead to drainage systems being overwhelmed. Careful planning above all else is particularly important if subsequent damage is to be avoided. “Together, drainage systems and emergency drainage systems must be capable of draining the volume of water expected to fall at the building’s location over the course of a century (r (5,100)) within 5 minutes.” This is precisely why a drainage plan should be created for every property. This plan must include details of the type, number and diameter of drains, as well as the position, dimensions and accumulation height of emergency drainage.

Some of the most important standards that must be observed in this regard are DIN EN 12056, DIN EN 752, DIN 1986-100, DIN 18234-3, the Flat Roof Guidelines and the VDI 3806 standard.

+ Types of flat roof drainage

Types of flat roof drainage

A distinction is made between three types of drainage system that are used in roof drainage:

  • Gravity drainage (interior drainage)
  • Vacuum drainage (suction system / interior drainage)
  • Exterior drainage

Gravity drainage is the most common type of drainage. Regulations for the gravity system are set down in DIN EN 12056-3 and DIN 1986-100 in this regard. Depending on the slope situation, gravity drainage systems can be designed as interior or exterior systems. Flat roofs should have a minimum slope of 2% according to the rules and regulations. There should be a roof drain at every low point on a flat roof, and every roof drain should have an emergency overflow. Emergency overflows must be arranged at the outer edges of the roof surfaces so that water can be drained freely. A separate emergency drainage system with accumulation height, which drains water onto the premises freely, is included in the interior drainage channels / grooves.

+ Cutting costs

Cutting development and construction costs

A remarkable cost minimisation approach for new build projects can be found where it is least expected: in the plan for the roof drainage system. Often, people don’t give rainwater drainage a second thought until the very end of the project. Yet, from a financial point of view, considering roof drainage while planning a building with a view to cutting development and construction costs is certainly an idea worth pursuing.

Downloads for the area of application

RESITRIX® Stainless Steel Accessories Datasheet

RESITRIX® Installation Instructions

RESITRIX® Product Catalogue

RESITRIX® Specification Guidlines