Roof greening is an effective way of greening. As an important part of urban greening work, it has been strongly advocated and promoted. Roof greening can effectively reduce the temperature of the roof, protect the building layer, prolong its service life, adsorb dust and also play a role in noise reduction.
The benefits of roof greening are obvious. There is no doubt that the big cities have been promoting green roofing by government departments for more than 20 years, but the actual effect is not so satisfactory. Beijing as an example, the promotion of green roof for more than 10 years, by the end of 2015, the city has completed the roof of the green area of 2 million square meters, accounting for only 3% of the total roof area of all buildings in the city, the low popularity rate is surprising.
Then, what about the follow-up situation of the 2 million square meters of building roof that has completed the roof greening? It is understood that 500,000 square meters of roof greening plants due to a relatively simple species, poor disease resistance, coupled with management and maintenance work is not in place, the emergence of pest and disease problems later, soon faded to death, and finally the whole film was eradicate. It is very wasteful for money and work.
In addition, there are two difficulties in roof greening:
First, there are certain requirements for the bearing capacity of the roof. Planting flowers on the roof must lay a layer of soil for its growth, and if it is set up, it will be heavier. On the one hand, most roofs do not take into account the load-bearing capacity required for roof greening at the beginning of the building; on the other hand, increasing the load-bearing means that the cost increases, and many developers are not willing to pay such a fee.
Second, there is a possibility of damage to the waterproof layer of the roof. Generally, the daily irrigation and fertilization necessary for the growth of flowers and plants. If the roof is infiltrated by water for a long time, and there are some corrosive substances in the fertilizer, it is very likely that the waterproof layer will be damaged. At the same time, since the waterproof layer is covered under the grass and soil, if leakage is formed, it is difficult to repair.
In contrast, the use of artificial turf for roof greening does not need to be concerned about it. It can be directly paved on the roof without additional load bearing; it will not cause damage to the waterproof layer, but also play a certain protective role;No need to consider the problems of pests and diseases and post-maintenance, the seasons are always green without management, and natural rainwater can be cleaned.
The artificial turf has developed the function of cooling and noise reduction, which makes the artificial turf as the main body of the roof not only realizes the beautification and greening, but also realizes certain functionality. With the characteristics of low cost of artificial turf, simple paving, no maintenance and long service life, once popularized, the rate of roof greening will be greatly improved.