Green roofs - future of urban life Jure Šumi
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Green roofs - future of urban life
Jure Šumi
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Green RoofsGreen roofs as old as „Hanging Gardens of Babylon“
In modern times, Germany was the first to start with green roofs about 50 years ago.
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Types of green roofs
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Why green roofs
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• Energy Efficiency – green roofs reduce the energy consumption:– Up to 25% for heating*
– Up to 75% for cooling*
– Collective positive effect in „Central Europe-alike“ climate zones averages 7kWh per sqm/year (considering already pre-insulated roofs)
• Lower Urban Heat Island Effect
The infra–red image shows that on a typical day, the Chicago City Hall green roof measures almost 80°F (40°C) cooler than the neighbouring conventional roof
Temperature differences between a Green and Conventional Roof **
Main positive effects of green roofs
* National Research Council of Canada** national center of excellence/ASU
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• Significant impact on CO2 emissions– 1 sqm of lawn can absorb 5 kg of
CO2/year
– Reduction of energy use also has its impact on carbon dioxide reduction (3,2kg CO2/sqm per year)*
– To give a perspective – 1 sqm of green roof can absorb as much of CO2 as one car produces when driving from Zagreb to Varaždin (cca 80 km).
• Cut back on the amount of dust and other pollutants in the air – 1 sqm of green roof remove 0.2 kg of
airborne particulate from the air every year**.
• Better storm water management– In some countries (Germany.
USA,..) owners of buildings can reduce their municipality taxes related to storm water management up to 50% simply buy setting up green roofs .
• Increased Roofing Membrane Durability
- Double life time of roof surfaces
• Increased Biodiversity
• Positive impact on people
* National Research Council of Canada** national center of excellence/ASU
Main positive effects of green roofs
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Standard basic components / layers:
• Vegetation
• Growing media
• Filter membrane
• Drainage
• Root barrier
• Waterproofing
Traditional extensive green roof systems
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Variable water absorption capacity– many substrates have low water absorption rate
when totally dried out
Heavy – soil substrates have density 900– 1200 kg/m3– suitable thickness to provide enough water
storage is between 8 - 10 cm
Labour intensive – to work on 1.000 sqm green roof means moving
cca. 100 tons of soil substrate on the roof to make a proper ground for vegetation
Costly – it takes time and extensive man and machine
power to make it done
Main pitfalls of traditional systems
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What to change?It is all about substrate and its quality & performance!
Good substrate:• is light weighted• has high constant high water absorption rate• provides long-term water retention stability• offers good thermal insulation property and• is easy to install.
Needled rock mineral wool fibres combined with superabsorbent polymers
Substrate typeTotal Water
Holding Capacity(% of volume of substrate)
Substrate weight
10 cm deep
Water Holding Capacity
10 cm deep Sandy soils 10 - 20 110-120 10 - 20Loamy soils 20 - 30 120 - 130 20 - 30Clay soils 30 - 44 130 - 150 30 - 44Green roof substrates up to 35 80 - 100 up to 35Needled felt (110 kg/m3) 77 11 77Needled felt with polymer up to 90 11,1 up to 90
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Advantages of Urbanscape extensive green roof systemHigh and constant water absorption rate with long-term water retention stability- Suitable thickness to provide enough water
storage is between 2 and 4 cm
Lightness – Urbanscape substrate density is 110 kg/m3
which allows to build green roofs also on buildings where existing systems cannot be successfully implemented.
Low labour intensity– to work on 1.000 sqm green roof means
moving between 2 - 4 tons of Urbanscape substrate on the roof
Low cost installation – due to easy set-up process up to 30%
lower cost for installation
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The new world of new applications to tackle
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Urbanscape roof vegetable gardens
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Landscaping applications
Slope greening
Gardens, Parks, Graveyards
Agriculture in dry areas
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Simple system
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Urbanscape in-house gardens
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Q & A