Construction of green roofs
Roof gardens are becoming more and more popular in urban areas both because of aesthetics because they increase the attractiveness and value of the object itself, and because of many other factors such as energy efficiency, air quality, rainwater storage, and as one of the most important factors today, which is a positive influence on mental user's health.
There are two types of roof gardens and they are intensive and extensive green bloods.
The circumstance that decides on the formation of one of these two types of gardens is the carrying capacity of the building. Based on the static calculation, we decide whether it will be on the roof be an intensive or extensive green garden.
Extensive green roof characterized by low vegetation such as sedums (plants very resistant to extreme environmental conditions and requiring minimal maintenance). Considering the resistance and self-sustaining nature of these plants, a watering system is not necessary. It is necessary to remove weeds and feed the plant twice a year.
In contrast to the extensive green roof, the intensive one contains high vegetation, thus a larger amount of substrate, garden furniture, but also a watering system, which is necessary. This kind of sight roof garden it is intended for active use.
In addition to the visible differences, these roofs also differ in the layers of material on which the roof garden begins.
Layout of green roof layers
The most important starting point for formation roof garden is the correct installation of waterproofing, which, in addition to its basic purpose, prevents the penetration of plant roots. A geotextile is placed on this layer as a barrier that will protect the waterproofing from possible damage. A drainage-accumulation film is placed on the geotextile, the role of which is reflected in the accumulation of water due to watering and atmospheric precipitation. Drainage accumulation foils are filled with light material - expanded clay. A geotextile filter layer is placed over this layer. Its role is to keep fine particles from the substrate, so you are sure that the drainage system will perform its function well. After placing these layers, a layer of specialized substrate follows, which must have certain properties characteristic for this purpose, which is to be very nutritious and light. Plants that are planted on green roofs they must be very resistant, most often they are autochthonous species that are adapted to the given climatic conditions.