New roof saves energy and cuts emissions
The Knauf Insulation team created, financed and delivered the materials for the custom-designed 600m2 green roof and oversaw its installation remotely with the local teams.
The customised school roof now features a root-resistant two-component waterproof layer, a drainage layer as well as a 2cm layer of Mineral Wool Urbanscape green roll to absorb and hold water as well as nurture plant roots. An additional 10cm of soil was then added on top with an irrigation system.
Walkable grass blankets were then installed on the roof along with planter beds for ornamental plants and fruit growing.
“Our Urbanscape roof enables passive cooling on the building by evapotranspiration, limiting the entry of heat and ensuring the temperature for the children and teachers in the school is much more comfortable than before,” said Domen.
Research by Knauf Insulation’s building experts found that the amount of energy needed to keep the rooms comfortable at 24°C would be cut by 82% by the green roof compared to the original grey concrete, if those rooms were air conditioned.
By limiting the amount of excessive heat coming into the building thanks to the vegetated and insulated building envelope, less energy is needed for air-conditioning to create a comfortable temperature and emissions are lowered.
The upgrade is good for the building users’ budget, good for the urban electricity infrastructure, which can struggle in summer heat peaks, and great for the environment.
The green roof also acts as a protective layer for the roof, protecting against ultra-violet rays, mechanical defects and deformations caused by high temperatures as well as absorbing pollution particles.
Green roof’s stormwater benefits
During heavy rains, the roof can also retain water which prevents deluges of rainwater flooding the sewage system. Our Urbanscape team calculations, based on historical local climatic data and the measured water retention performance of our Urbanscape solutions, found that 47% of rainwater will be retained, reducing the need for extra irrigation.