Green roof: the advantages
A green roof reduces CO2 emissions and fixes pollen, thereby reducing the risk of allergy. The greenery also constitutes excellent thermal insulation (which reduces the heating bill) and sound insulation for the home. In the event of heavy rain, part of the water is collected directly by plants, which minimizes the risk of flooding of treatment plants. Finally, the green roof promotes the return of birds to urban centers which find a new place to live there.
Green roof: the manufacturing stages
The green roof is particularly suitable for flat or slightly sloping roofs (below 35 degrees). Beyond that, you need to call in a specialist. First, create a slope if the roof is flat with wooden battens and fill with aggregates. Install insulating plates (extruded polystyrene type). Then install a waterproof membrane with an anti-root agent and a drainage layer. Place a filter cloth to contain the roots and the substrate while letting the water pass. Finally, place the substrate on which the vegetation will grow (compost, sphagnum moss, potting soil, etc.).
Green roof: what type of vegetation?
Once your green roof is installed, you cannot plant everything. There is no question of planting trees or shrubs if you do not have a roof that is strong enough to support the weight of vegetation and irrigation. For a flat roof, you can opt for grass, shrubs and perennials that require little watering and maintenance.