Roof greening is a greening form that does not occupy land on the ground, and its application is more and more extensive. Its value lies not only in adding greenness to the city, but also in reducing the radiant heat on the roof of building materials and weakening the heat island effect of the city. If it can be properly used and promoted to form a city's aerial greening system, the improvement of the urban environment is immeasurable.
First, the characteristics of roof greening The temperature and humidity conditions are poor because the roof is high and the surroundings are relatively empty, so the wind speed is greater than the ground, and the water evaporates quickly. The higher the roof is from the ground, the worse the greening conditions. 2. Gardening and plant selection have certain limitations. Because of the limitation of roof load-bearing capacity, soil environment that is completely consistent with the ground cannot be provided. Therefore, the height difference between landscapes should be avoided during design, and deep rooting should generally be avoided in plant selection. Or grow tall tall trees. 3. The regular roof shape of the greenland boundary is generally a regular geometric shape with multiple repetitions, especially in the community. When designing, attention should be paid to harmonization and change, forming rhythm.
Second, the green roof design 1. Garden form roof greenery can be made into a small garden to serve visitors, mostly for service buildings???14.???? Oysters, glass, oysters, oysters, oysters, oysters, oysters, oysters, oysters, oysters, oysters, oysters However, it is possible to choose between 0 and 40 centimeters for a strong meal, and 60 to 80 centimeters for local cooking. This kind of roof garden should pay special attention to the overall consideration in the design of the building to meet the requirements of the roof garden on the load-bearing capacity of the roof. The design should also try to make the heavy parts (such as kiosks, flower racks, rocks, etc.) designed on the top of the beam. position. 2. In the form of color blocks, the foliage plants such as Euonymus japonicus, Eucalyptus trifolii, and Golden Ligustrum lucidum are used, or neat and colorful colored grass flowers are combined with the lawn to form a pattern. The effect of the plan is good. It is mostly used for the greening of low-rise roofs when the roofs are staggered. Because it pays attention to the overall visual effect, there is no park road in the interior, leaving only a management channel. 3. Potted flowers are used in the seasonal arrangement, which can be changed at any time depending on the flowering period. Draping plants can be placed on the edge of the building, taking into account the greening of the walls. This method is mostly used for greening low-rise roofs.
Third, the structure layer of the landscape layer is generally divided into thermal insulation layer, waterproof layer, drainage layer, filter layer, soil layer, plant layer and so on. 1. Thermal Insulation: Styrofoam board can be used, and care should be taken when laying it. 2. After the roof of the waterproof layer is greened, leakage should absolutely be avoided. Once a problem arises, it will cause the users of the house to have a repelling mentality, which will directly affect the promotion of roof greening. It is best designed as a composite waterproof layer. 3. The drainage layer is provided on the waterproof layer, which can be combined with the roof rainwater pipeline to discharge excess water to reduce the burden on the waterproof layer. The drainage layer is mostly made of gravel, ceramsite and other materials. 4. Planting layers are generally made of soil-less substrates and are made of humus, perlite, peat, and humus, peat soil, and sand.
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