Tech-Drainage Layer
The Tech-Drainage
revolutionizes the functionality of
green-roofs
![tech-drainage-browatech](https://browatech.com/wp-content/uploads/2020/03/tech-drainage-browatech.png)
After the successful patent registration, the Tech-Drainage layer was first deployed
- as a drainage layer for ornamental plants and in raised-bed gardening,
- as an underlayer for the production of ornamental plants and rolled turf,
- as moss walls,
- as a stormwater management tool,
- as a camping pad
The high effectiveness of the Tech-Drainage layer and its multiple applications are confirmed by technical research institutes and described as highly innovative.
Patent number: PCT/EP2017/0 53789
![](https://browatech.com/wp-content/uploads/2020/03/tech-drainage-icon.png)
The high effectiveness of the Tech-Drainage layer and its multiple applications are confirmed by technical research institutes and described as highly innovative.
A traditional green-roof with retention effects turns into a detention-roof:
Conventional green roofs absorb rainwater and consequently reduce runoff volumes over the course of a year. However, this only works effectively if the green-roof is largely dry. As soon as it is wet, it works like a soaked sponge, i.e., it cannot absorb any more water. For a soaked green roof, the rate of runoff is the same as the rate of rainfall.
Traditional green-roofs reduce the rain volume which arrives on the streets by 50% through the process of evapotranspiration. This 50% is said to be “retained” and never becomes runoff. However, the remaining 50% that does become runoff is the very reason why traditional green-roofs are not sustainable stormwater management tools. This is especially the case during heavy rainfalls or multi-day rainfalls. It can be compared to a parachute which opens only every second time. A traditional green-roof is excellent, but not sufficient on its own for flood protection and to prevent expensive damages and loss of lives.
![gruendach](https://browatech.com/wp-content/uploads/2020/03/gruendach.jpg)
![regen-drainage](https://browatech.com/wp-content/uploads/2020/03/regen-drainage.jpg)
![hochbeet-isolierung-browatech](https://browatech.com/wp-content/uploads/2020/03/hochbeet-isolierung-browatech.jpg)
The Detention Roof is different!
It goes without saying that it has all the benefits of a traditional green roof:
- excellent retention effect,
- reduction of heat island effects in inner cities and on widely concreted areas in general,
- improved air quality,
- more biodiversity,
- longer lifespan of the roof membrane,
- settlement of bees and other insects etc.
AND IN ADDITION TO THAT it is an essential stormwater management tool that works in 100% of the cases – even on sloped roofs.