Implementation of green roofs

We design and create green roofs and rooftop gardens tailored to specific spaces, whether it’s a family or apartment house, office building, shopping center, underground garage, or another commercial property.

Turnkey solutions

We take care of everything: design, project planning, construction solutions, installation of irrigation systems, and other technologies. We even select, deliver, and plant the vegetation.

Extensive and intensive roofs

We design and build simple green roofs with low maintenance requirements or walkable and livable roofs for social and recreational activities.

Assistance with grants

We provide an up-to-date overview of financial support options from the government and from specialized programs. We assist with preparing all the necessary documents for submitting an application.

Green oases in the heart of the city

We deliver eco-friendly solutions that ensure efficient rainwater management, improve the thermal insulation of buildings, contribute to environmental protection, support biodiversity, and create a pleasant climate.

Ondřej Perlinger

Head of the Water Management Projects Department

What we build

Extensive roof

It serves as both insulation and decoration but is not designed for foot traffic. It is characterized by low maintenance requirements and lightweight construction. Hardy plants such as sedum and succulents, which tolerate adverse conditions and require minimal care, are planted in a shallow layer of substrate (5–15 cm). This type of roof is suitable for various buildings with low structural load capacity and limited accessibility.

Intensive roof

It can handle high loads, offering numerous usage possibilities. It can serve as a relaxation area with benches and garden features, a playground, or a garden for growing vegetables and herbs. It has a thicker substrate layer (30–100 cm), allowing for the planting of not only plants but also mature trees. Compared to an extensive roof garden, it requires regular maintenance and the installation of an irrigation system.

Sloped roof

It is installed on roofs with a certain incline, typically ranging from 5° to 45° or even steeper. Unlike standard flat green roofs, it requires specialized structural solutions to ensure the stability of the plant cover and prevent substrate or vegetation from sliding due to gravity.

How we work

We carefully plan every step to ensure long-term, seamless operation of the green garden.

Roof structure assessment

We arrange a structural engineer's evaluation to verify whether the roof structure can support the additional load (substrate, vegetation, water). For intensive roofs, higher load capacity must be considered. We also evaluate the roof's slope – for sloped roofs, additional stabilization measures may be required.

Green roof composition design

We select the appropriate substrate and plant species based on local climate conditions, aesthetic preferences, and the roof's purpose. We choose a drainage system which ensures that excess water is removed while retaining sufficient moisture for the plants.

Substrate preparation and waterproofing

We clean the roof surface and install a specialized membrane that protects the roof from moisture and is resistant to root penetration. We ensure proper placement and impermeability of the waterproofing to prevent future moisture-related issues.

Installation of drainage and filtration layers

We lay a drainage mat or layer that retains enough water for the plants while channeling excess water away. We place geotextile or another filtration layer to prevent fine substrate particles from washing into the drainage layer and causing blockages.

Application of substrate and planting vegetation

We evenly distribute the substrate according to the predetermined thickness. For intensive roofs, the substrate layer is thicker, allowing for the cultivation of not only a wider variety of plants but also shrubs and trees. We plant the selected vegetation and trees.

Installation of an irrigation system

For intensive green roofs, installing an irrigation system is essential to provide plants with sufficient water, especially during dry periods. We can also install an automated irrigation system with moisture sensors to ensure optimal watering and water efficiency.

Finishing touches and final inspection

We check that all layers are securely in place and perform final adjustments, including securing the edges.

Would you like more information?

Are you interested in green roofs or do you have a question? Fill out a simple form and we will get back to you within 24 hours.

You can also reach us on the phone: +420 235 522 252
or via e-mail at info@dekonta.cz

FAQs

Composition of a green roof

Load-bearing roof structure
This is the foundation of the entire roof and must be strong enough to support the weight of all layers, as well as the load from vegetation and water. For intensive green roofs, higher load capacity is required.

Waterproofing layer
This protects the roof from water infiltration. It must be of high quality and resistant to plant roots to prevent structural damage.

Root barrier
Prevents roots from penetrating the waterproofing layer, which could damage the roof. In some cases, this layer can be integrated with the waterproofing.

Drainage layer
Allows excess water to drain while retaining the necessary moisture for plants. It is often made of plastic or ceramic materials with high absorbency.

Filtration layer
Prevents fine particles of the substrate from entering and clogging the drainage layer. It is usually made of geotextile.

Substrate
A specialized growing medium that provides nutrients and retains water for plants. The thickness and composition of the substrate vary depending on the type of green roof (intensive or extensive).

Vegetation
Plants that form the green cover. The type of vegetation depends on the substrate thickness and the type of green roof.

Drainage of a green roof

Drainage of a green roof is crucial for ensuring proper functionality and longevity of the entire system. It includes efficient removal of excess water during heavy rainfall to prevent overloading the structure or damaging the vegetation.
The system may include a drainage layer that regulates water flow and systems that retain part of the rainwater for irrigation. It is essential that the drainage be tailored to the specific conditions of the project and the type of roof—extensive or intensive.

Why choose a green roof?

Better thermal insulation
Green roofs help maintain a stable indoor temperature, reducing heating costs in winter and cooling costs in summer.

Roof protection and extended lifespan
Vegetation and substrate shield roof surfaces from UV radiation, extreme temperatures, and weather conditions, significantly extending the roof's lifespan.

Environmental benefits
Green roofs improve air quality, absorb dust and CO2, and support local biodiversity. They also retain rainwater, reducing the risk of overloading drainage systems.

Space for relaxation
Unused rooftop space transforms into a pleasant oasis for relaxation, where decorative plants or herbs can be grown.