Green Roof Systems enliven Urban Spaces
VIRIdiVITA premium roof – Water Storage Mats for Green Roofs
In close cooperation with the Swiss garden and landscape architect Urs Sutter, FoamPartner has developed special foams for modern green roof systems that optimally combine ecological demands with economic benefits.
The core of these green roof systems is an innovative water storage mat that is marketed by the company VIRIdiVITA GmbH under the name VIRIdiVITA premium roof. Further details about the product, especially about the design and the functional properties of VIRIdiVITA premium roof are available on the following pages.
Nature Oriented Rainwater Management Through Roof Greening
Protection against extreme rain fall & improvement of the microclimate
In the event of heavy rain fall, a quantity of 5 l of rain can fall per square meter within 5 minutes. If the heavy rain continues, the sewage system is quickly overloaded, and flooding can occur in the basement and first floor of a building.
An essential task of the roof greening and the water storage mat is water retention. With intensive green roofs, an almost complete retention of rainwater can be achieved. This not only relieves the settlement water supply, but also improves the local microclimate in the long term, since the evaporation of the stored rain water ensures active cooling of the ambient temperature, especially in hot months.
Functionality of the VIRIdiVITA green roof system
The storage capacity of a VIRIdiVITA premium roof water storage mat is up to 42 l/m2. This is possible with material thickness of the retention layer of only 50 mm. The VIRIdiVITA substrate layer can additionally absorb 18 l/m2 of rainwater. This results in a total water retention capacity of 60 l/m2.
The water binds on the surface of the roof greening system, i.e. in both the substrate and the retention layer, and is thus available to the plants. The HyPore Roof foam stores the water in the retention layer. It is characterized by a unique, double cell material structure. Its fine pores are particularly hydrophilic and are largely responsible for the absorption and retention of rainwater. Special additives are also attached to the cell wall of the larger pores, which have an additional absorbing effect. Since they are already incorporated into the foam matrix during the manufacturing process, they are permanently available in the application. A further advantage of these additives is their growth promoting property for the plants.
In addition, the air permeability of the foam plays an important role, as it allows the rain to evaporate. Due to the open cell structure of the larger pores, 30-40% of the water can evaporate within 24 hours.
Despite the minimal thickness of the water storage mat, VIRIdiVITA premium roof can be used to create a particularly natural and ecologically valuable green roof with an optimal water absorption capacity. At the same time, the weight on the roof is reduced to a minimum.
Advantages of foams over other materials
Polyurethane foams offer numerous advantages over other materials, such as non-woven, mineral or stone wool, along the entire product life cycle - from manufacture to application and disposal. The HyPore Roof and TCL 40100 foams have been specially developed for the VIRIdiVITA premium roof water storage mats and offer the following properties.
HyPore Roof and TCL 40100 are available already bonded as a combined retention and drainage mat. In total, the optimal material thickness is 70 mm. This can also be adapted to individual requirements.
The mat can be cut to any desired size without special equipment, making installation extremely easy.
The water storage mat offers a high water absorption capacity, but at the same time drains excess water. The material is particularly light, so that the mat in dry condition only weights 2.5 kg/m2 and in saturated condition 44.5 kg/m2. The substrate adds 92.5 kg/m2 and 110.5 kg/m2 respectively. This makes the lightweight roof greening system particularly suitable for flat and pitched roofs.
VIRIdiVITA premium roof water storage mats have a service life of about 30 years.
It does not have to be disposed of as hazardous waste, as is the case with other materials, but can be recycled via the waste cycle management system.
|Product Properties||Test Method||Hypore Roof||TCL 40100|
||DIN EN ISO 845||28||28|
||DIN EN ISO 3386-1||20||10|
||DIN EN ISO 1798||150||150|
|Elongation at break
||DIN EN ISO 1798||30||60|
|Air flow [l/(m2+s)] at 200 Pa||DIN EN ISO 9237||600||4500|
|Water retention [g]||RPA-1010||350||-|
* The indicated data refer to typical values and slight variations are in general within the specification.
Please consult your local sales representative at FoamPartner to obtain the actual product data sheet with the latest technical product details.