Green roofs, most typically flat roofs, can be partially or completely covered with vegetation soil. This system reduces the heat island effect by absorbing heat. We see it dramatically improves the roof’s insulating values. These roofs lengthen the lifespan of the roof, sometimes as much as two to three times. This results in savings in heating and cooling costs as well as roof repairs and replacement. How nice is that?
The environmental impact of these buildings and their green roofs became increasingly important in today’s design and installation. They are giving a new value to the role of buildings within urban planning. The design brings back the natural element in the urban environment. Secondly, the design is advantageous in its efforts to provide solutions for important issues. Issue include urban heat, island effect, and storm water management.
GREEN ROOF TYPES
Extensive green roofs
Extensive green roofs will have shallow (typically 7–10cm) soils and are the lightest type. They support sedums, moss, herbs, and grasses. They also support other vegetation, which is where low or no maintenance is required.
Extensive green roofs providing attractive protection to the waterproof
membrane can significantly reduce water run-off. A completed roof needs inspection once or twice per year. Regular fertilization once per year, whether in fall or early spring, is necessary to ensure proper growth and success. The irrigation system is not needed in many conditions. However, if extremely long periods of dry weather conditions are existing, irrigation is necessary. Regular access to the extensive roof is not necessary.
Intensive green roofs
Intensive green roofs have a deeper soil layer (15cm upwards). This type of roof also has a wider variety of plant types can be grown. This includes lawns and ornamental bushes and semi-mature trees. The type of planting determines the depth of soil required, the need for an irrigation system, and the level of maintenance. Regular roof access is normally provided. So, this is great for paved areas, walls, and even water features.