Project general details
WORLD GREEN INFRASTRUCTURE AWARD
GREEN ROOF OF WARSAW - FOREST CAMPUS
Nominator
Investor
Supplier
Architect
Flywheel PR
HB Reavis
HRA Architekci
HB Reavis Construction
Location (City)
GPS
Country
Region
Year of nomination
Warsaw
data
Poland
Europe
2024
Project specifications
The Forest office campus features a sprawling rooftop garden, a vibrant public space with diverse plants, including flowers and herbs, offering an urban oasis with panoramic Warsaw views. Over 200 trees and numerous shrubs enhance its natural allure. Accessible to employees, neighbors, and children from the onsite kindergarten, it provides a versatile area for relaxation, exercise, and enjoying coffee with stunning vistas. The garden hosts cultural, entertainment, and health-promoting events. The sensory section, with various fruits, vegetables, and herbs, is accessible to people with disabilities due to the height of the gardening beds and wide maneuvering spaces. The building integrates soil moisture sensors and rainwater irrigation, achieving a high BREEAM rating. The rooftop garden flourishes with light-loving plants like Phlox subulata, Perovskia 'Blue Spire', Hydrangea paniculata 'Lime Light', and butterfly-attracting Buddleja davidii, Shepherdia argentea for its edible fruits.
Object type
Roof accessibility
Roof slope
Year of completion
Project in operation?
Commercial buildings
Public
0-5 degree
2022
YES
Green roof area (m2)
7446
Green roof specification
Method of establishment of vegetation
All plantings were implemented by the professional greenery contractor with a very large experience with realizations on the green roofs. All works were integrated with the rest of the building development. The works concerning greenery were mostly made after all the construction of the building ended. At the design stage, decisions regarding the planned greenery, loads and requirements were made from the very beginning of the work.
Vegetation
The roof gardens both on the ground floor and on the roofs are filled with multi-layered plantings. There are trees (Acer campestre, Betula utilis, Carpinus betulus, Fagus sylvatica etc.), solitaire shrubs (Cornus kousa, Syringa vulgaris, Acer tataricum etc.], shrubs and hedges (Cotoneaster lucidus, Ilex meservae, Taxus baccata, Shepferdia argentea etc.), perennials and ornamental grasses, meadows and recreational lawns.
Vegetation layer
In the investment there were basically two types of substrate used: the intensive roof substrate and extensive substrate. The intensive type was implemented under most of the plants such as: trees, solitary shrubs, shrubs and hedges, perennials, grasses and lawn, both on the ground floor and roofs It is a vegetation layer for multi-layered intensive green roofs, on roofs with high load capacity and suitable for a broad plant species diversity. If the depth of the intensive substrate was larger than 40cm it was filled with aeration substrate. The extensive substrate in thin layer ca. 8-10cm was used under extensive planting such as sedum.
Retention layer
Retention layer in this case is the Drainage and Separation Boards FKD40 and FKD24 and partly the roof substrates itself.
Filtration layer
Optigrün Filter Fleece FIL 105 made of polypropylene. It’s vertical water permeability is 130 l/s x m2. It is used when the drainage system needs to be protected from fine particles entering from the substrate layer.
Drainage layer
Under designed plants there were used also products from Optigrün. For most of the intensive plants it was implemented with Drainage and Storage Board FKD 40, under meadows and extensive plantings it was Drainage and Storage Board FKD 25. Both of the Boards are made of recycled HDPE. It’s water discharge capacity is 2.31 l/(m*s) and 1.41 l/(m*s) (at 2% roof pitch). It is worth to mention that above all the drainage outlets were used inspection chambers. In accordance with current green roof regulations, drainage outlets must be accessible at all times. For this reason, inspection chambers should be used above the drainage outlets. Depending on height, our inspection chambers can be used for both extensive and intensive green roof structures.
Separate layer
None acc. to the producers’ guidelines
Protective layer
Trickle Protection Fleece Optigrün RS, used on the insulation level for inverted roofs (XPS) without requirements concerning joint building authority approval for insulating material and the separating layer. It is made of polypropylene.
Root layer
Roots of the designed plants are planted in specialistic roof substrate both intensive – all plants on the ground floor and on the roofs, and in some cases in extensive -extensive plants such as sedum and small grasses.
Category:
GREEN ROOFS
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