Roof greening project is special in space, and there are some problems that must be faced.
1. To grow flowers and grass, the house needs to bear at least 30 cm thick soil. If the roof of a house is covered with mud, the house needs to bear dozens of tons of weight. If you want to join the superficial culture, you need to bear more weight. However, the average house design can't bear such a weight.
2. If there are plants on the waterproof layer of the roof structure, it must be covered with soil and plants. If the roof leaks, it is difficult to find the leak. Plants have roots and roots, and roots are pervasive. If the waterproof seam or the building itself uses a material with good air permeability, the roots will immediately immerse and spread, eventually leading to water seepage in the building.
Without fertilizer and water, flowers and plants can't survive. If there is wet soil and water on the roof of the house for a long time, coupled with the corrosion of acid, alkali and salt in the fertilizer, the waterproof layer will be slowly destroyed. If the waterproof and corrosion resistance of the materials used in building roofs are not good, sewage will penetrate into the indoor environment through the cracks in the materials.
In case of rainstorm, sediment and pollutants will be washed down, and the sewer must be blocked. In windy weather, flying dust will also pollute the environment.
In windy and rainy weather, plants or potted plants on the roof are likely to be scraped off, and flowerpots falling from the sky will do harm to pedestrians on the road.
The altitude of the roof is relatively high, and it is relatively empty everywhere, so the wind speed will be relatively high and the water evaporation will be faster. The roof is too high from the ground, and the plant species are relatively single.
Therefore, when designing a house, we need to consider the load-bearing and drainage of the roof. If we don't consider these blind promotion, it will definitely do more harm than good.
6. After roof greening, flowers and plants need to be maintained. Different kinds of plants have different protection techniques and methods. Generally speaking, the roofs of houses are maintained by some professional building greening companies. They have professional technology and standardized maintenance.
Roof greening seems to have a long way to go to improve the environment.
(The above answers were published on 2016-01-13. Please refer to the actual situation for the current purchase policy. )
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