Suction+Pressure Blowing

June 26, 2025

Greening with a system - roof construction at Barryland in Martigny

In the heart of the Valais mountains, a sustainable and functional green roof system was created that meets both ecological and technical requirements. On the grounds of Barryland in Martigny, a popular visitor center around the legendary St. Bernard dog, a well thought-out roof structure with a focus on water retention, protection and vegetation was created on an area of 1,300 m².

Basis for successful green roofs
The first and fundamental step was to install the BSM 64 irrigation and protection mat from ZinCo. With a water storage capacity of around 7 l/m², this synthetic fiber mat provides an optimal basis for extensive greening. With a weight per unit area of 650 g/m² and a thickness of 7 mm, it also reliably protects the underlying roof waterproofing from mechanical loads and makes an important contribution to the longevity of the entire system thanks to its resistance to rotting and environmental influences.

Efficient drainage - Floraset® FS 75
The Floraset® FS 75 drainage element was used above the protective mat - a stable element made of expanded polystyrene rigid foam that can be used on both sides. With a height of 75 mm, a water storage capacity of around 3 l/m² and a compressive strength of approx. 55 kN/m², it is ideal for use on flat roofs. Particularly noteworthy is the high drainage capacity with a low roof pitch, which guarantees controlled water drainage during heavy rainfall events and thus relieves the roof structure.

Substrate structure with WA Dachgrünplus
In the next step, the W+A Dachgrünplus vegetation substrate was added - a total of around 120 m³, in a compacted layer thickness of 8 cm. The substrate consists of recycled brick chippings and high-quality green compost. It is characterized by its high water storage capacity, air permeability and nutrient availability and meets all requirements in accordance with the FLL guidelines for green roofs. With a water-saturated density of approx. 1445 kg/m³, it offers ideal conditions for the planned sedum planting.

Natural design thanks to round gravel
An additional 19 m³ of 16/32 round gravel was laid to define the edges of the roof and the exit areas in terms of design and function. The gravel was laid in strips between 30 and 50 cm wide. In addition to the visual structuring, the gravel area also fulfills fire protection requirements and serves as a maintenance path.

Finishing with sedum mats
The upper end of the roof structure is formed by pre-cultivated sedum mats covering an area of 1300 m². These ensure immediate greening with a high plant density and biodiversity. The sedum species used are particularly drought-resistant, low-maintenance and provide a changing, attractive carpet of plants all year round.

The implementation of this project on the roof of Barryland not only created an ecologically valuable habitat, but also protected the building structure in the long term. The materials used are robust, sustainable and coordinated - from the substructure to the vegetation layer. Thanks to the combination of protection, drainage and planting systems, this green roof meets both technical and design requirements and will contribute to the long-term preservation of the building structure and the urban microclimate.

Project data

End of project
June 2025

Client
Barryland, Martigny

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