DrainHero safety drainage

Learn how JUAL DrainHero safety drainage products can help meet the requirements of the Danish Authority of Housing and Constructions and SBI-273 instructions to prevent damage and roof collapse on large buildings.

10 things you need to know

  • Gutter taps are not safety drainage
  • Safety drains work independently of the regular roof drains
  • Safety drains ensure that the roof is not overloaded by e.g. cloudbursts or clogged sewers
  • As a starting point one safety drainage outlet / per roof drain
  • Safety drains must always be led directly to the open air and NEVER to a sewer
  • Safety drains must not hit a lower roof
  • Safety drain outlets must be placed close to the regular roof drain
  • The safety drain outlet inlet should be placed approx. 40 mm above the roof covering
  • Safety drain outlets are only in operation when there is water accumulation on the roof
  • Safety drain outlets can be both internal drains with a raised bowl well or designed as an ejector directly through the wall crown

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A necessity in modern construction

Safety drainage has become a key topic, especially in light of the latest guidelines from the Danish Authority of Housing and Constructions and the SBI-273 instruction. These guidelines emphasize safety drainage as essential in both new construction and major renovation projects.

The aim is to prevent damage and roof collapse in large halls and buildings where potential damage can have extensive financial consequences.

Parapet drainage with 90° bend and piping

Specially suitable for emergency drainage where drainage is to be integrated with a visible emergency drainage system and outlet on the ground. Parapet drainage with 90° angle transition for installation with vertical piping must always be led to the open, but bends and pipes increase drainage capacity.

  • High dewatering capacity
  • No visible pipe hole in the parapet
  • Applied with angle transition
  • Very low water retention
  • Drainage to the open at ground level

Efficient emergency drainage to secure buildings against extreme weather conditions

In recent years, we have seen an increase in both the amount and frequency of rainfall. This development places greater demands on new construction and renovation - especially when it comes to efficient safety roof drainage.

Adapting the drainage system of buildings to handle the increased amounts of water is crucial to avoid damage and degradation.

What is safety drainage?


When you install JUAL safety drainage products, you ensure that the roof is not overloaded by accumulated water and that the water does not run over the flashings.

The safety drain outlets works independently of the roof drains in the regular drainage system and steps in when there is water accumulation on the roof that the regular drains cannot handle because they are clogged by leaves or ice, for example, or because the drainage system is overloaded.

JUAL DrainHero brochure

Look up our JUAL DrainHero brochure, where you can read all about emergency roof drainage.

Learn how JUAL's proven safety drainage products and documented drainage capacity can help you comply with the Danish Authority of Housing and Constructions guidelines on preventing damage and roof collapse in large halls and buildings and SBI instructions.

DrainHero Brochure

Experts in safety outlets


At JUAL, we have been experts in drainage for a lifetime. With climate change and increased rainfall, we have become aware of how important it is to supplement standard drainage with an safety drainage system. With a significant investment in a high-tech test center, we have put ourselves in the driver's seat and we dare to call ourselves experts when it comes to measuring and documenting drainage capacity.

In combination with our experience, capacity and machinery with special tools and robots, this gives us the muscle to deliver complete safety drainage systems that meet the requirements of the new guidelines from the Danish Authority of Housing and Constructions.

Remember to consider safety drainage


Do you remember to install safety drainage? When you build a new building, it's important that you as a consulting engineer or architect consider safety drainage to comply with the advice in the new guidelines.

It's worth mentioning that the first roof drain must be placed a maximum of 7.2 meters from the gable, while the next one must be a maximum of 14.4 meters away. As a general rule, you should establish one safety drain outlets for every two ordinary drains.

Membrane-integrated products


At JUAL, we integrate roofing membrane on our drainage products under controlled conditions at the factory. This ensures that the critical penetrations are watertight when the products leave the factory, and the installation is simple and safe.

We integrate roofing felt in many qualities on stainless steel flanges, as well as roofing foils in PVC and TPO on foil-coated steel sheets. The adhesion between the roof membrane and flange is continuously tested according to current standards. The result is a 100 percent tight solution.

Documented dewatering capacity


"At JUAL, we have invested in a high-tech test center that can test manholes according to EN1253. Here we can measure how much the different roof drains can drain per second and how many square meters each solution can handle."


With the documented drainage capacity in hand, it is easy for, among others, consulting engineers to dimension the safety drainage system for the roof."


- Justinus Tróndargjógv, Product Developer, JUAL A/S
JUAL Group companies have joined forces

Our four operating companies JUAL A/S, Perform A/S, Bygtjek A/S and Fixnordic A/S have now merged into one entity: JUAL.