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Green roofs are becoming increasingly popular as a sustainable and eco-friendly roofing option. Green roofs involve the installation of vegetation on a waterproofing layer, providing a range of benefits such as improved insulation, rainwater management and good air quality. However, in order for a green roof to be successful, robust waterproofing is crucial.

Ecologically Safe Green Roof System

Modern living space with rainwater management

Due to growing environmental awareness, more and more flat roofs are being laid out as green roofs. The newly created green areas offer a welcome habitat for birds, insects and other microorganisms. They ensure an improved local microclimate and help our cities to heat up less in summer.

Green roofs also play an important role in managing the flow of water. Rainwater that falls on it is not drained off immediately by the green roof construction but is released slowly and in turn help, the sewage system from overloading or flooding. Modern retention systems reinforce this effect by temporarily storing large amounts of rainwater during heavy rain, thus enabling reduced drainage.

Root resistant waterproofing layer

To transform a flat roof into a green roof, it's crucial to have meticulous design and professional roofing installation. The selection of waterproofing membranes is of utmost significance and should be root-resistant to prevent any leakage due to root growth. Subsequently, a filter fleece and a unique layer for vegetation support are added over the waterproofing before planting can commence.

Types of green roofs

There are several types of green roofs, each with its own unique characteristics and benefits. Here are some of the most common types:

  • Extensive green roofs: These are the most common type of green roofs, and they are usually lightweight and require minimal maintenance. They feature a shallow layer of soil and are planted with drought-resistant sedum, grasses, or herbs. CARLISLE® extensive component green roof system consists of multiple layers including drainage, filter, substrate and sedum/ wild flower mat.

  • Intensive green roofs: These are more like traditional gardens and require a deeper soil layer to support a wider range of plant species. They can support trees, shrubs, and even vegetable gardens. intensive component. CARLISLE® green roof system consists of multiple layers including drainage, filter, substrate and a wide range of landscaping options depending on the substrate depth.

  • Modular green roofs: These consist of pre-grown vegetation modules that can be easily installed on the roof, making them a quick and easy way to create a green roof.

Extensive green roof

  • Vegetation layer

  • Filter layer

  • Drainage layer

  • Protective layer

  • CARLISLE® waterproofing membrane

  • Thermal insulation

  • ALUTRIX® vapour barrier

  • Substrate

Typischer Dachaufbau Extensive Begrünung
Typischer Dachaufbau Intensive Begrünung

Intensive green roof

  • Vegetation layer

  • Filter layer

  • Drainage layer

  • Protective layer

  • CARLISLE® waterproofing membrane

  • Thermal insulation

  • ALUTRIX® vapour barrier

  • Substrate

Modular green roof

  • Drainage

  • Filter layer

  • Substrate

  • Sedum

  • Key Features below:

  • The Sedum modules will arrive pre-grown on a pallet, weighing approximately 25kgs each i.e.100kgs per m2.

  • Lightweight with a high water storage capacity.

  • Different sedum species are well-rooted and grown to maturity.

  • Dimensions: 500mm x 500mm x 100mm.

  • Trays per m²: 4

  • Fast installation with click together

Modular green roof

Why do modern buildings need Green Roofs?

With many advantages and positive properties, green roofs are gaining importance worldwide. This applies equally to ecological and urban architecture as well as economic aspects. Green roofs offer significant advantages in terms of optimising the natural cooling of the environment during the summer season. The layer of vegetation on the roof ensures that the ambient air stays comparatively cool in summer, thus reducing the energy needed to cool buildings. The additional layer of vegetation effectively shields the roof from weather influences such as hail and UV radiation, thereby extending the life expectancy of the waterproofing.

Overheating of Cities

Urban areas are developing into so-called heat islands ("urban heat island effect") due to excessive sealing and heat from traffic, industry, and household heating. The lack of nocturnal cooling increasingly burdens the health of the urban population. Green roofs can help alleviate the energy surplus through absorption and water evaporation, making the urban climate more tolerable.

Green roofs can significantly improve air quality. Numerous harmful particles are filtered from the air by the surface of the vegetation alone.

Government Grants

Many governments and local authorities offer various support for green roofs. Measures range from attractive financial subsidies to recognition as ecological compensation measures to the inclusion of green roofs in urban development plans.

Energy Efficiency

In addition, the energy balance of a building can be significantly improved by a green roof. Today, there are various green roof systems that have a recognized thermal resistance and can therefore be included in building energy calculations to comply with the Energy Saving Ordinance (EnEV).

Benefits of green roofs

Green roofs fulfil the most important demand of responsible building in the 21st century: the sustainable combination of ecology and economy.

Benefits for the building owner

  • Extended lifespan of roof membrane

  • Protection against UV rays

  • Protection against extreme temperature differences

  • Protection against hail

  • Protection against crust formation

  • Minimisation of peak rainfall runoff

  • Additional fire protection

  • Heat shielding

  • Noise reduction

  • Additional insulation

  • Improvement in indoor climate

  • Provides cooling in summer and warmth in winter

  • Increase in building and property value

  • Savings on energy costs

  • Possibility of government funding

Benefits for the environment

  • Creation of new green areas

  • Creation of new habitats for flora and fauna

  • Creation of new relaxation and recreational areas

  • Counters the effects of intensive urban development

  • Rainwater retention

  • Binding of dust and pollutants

  • Improvement of urban climate

  • Noise reduction

  • Usable outdoor areas

  • Reduction of the effects of intense paving, sealing of surfaces, and increasing construction.

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