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If you are someone who lives in the city, it can get pretty polluted and having a roof garden can still help you stay connected to nature. Roof garden construction can be done by three methods: The first method is to make a container garden on the terrace, the second one is to make a lot of raised beds to grow plants, either permanent made of concrete or wooden. The last and third method is to make your whole roof or some selected part, a vegetation ground like a regular garden. In this article, we will learn how to make a vegetative garden.
The roof must be waterproofed, durable and frost resistant, if you’re growing plants on it, whether you will grow plants on containers, raised beds or on the roof itself, roof waterproofing is a must and should be the first step of terrace garden construction as it protects the roof from leaking.
Waterproofing covers up the entire surface of the roof, most importantly those spots where the plants will be planted.
The insulation layer(Protection Layer) makes a terrace garden resistant to moisture and temperature fluctuation and provides it with sufficient mechanical strength. It is made mostly of polyurethane foam.
PIR panels are well suited as a layer of insulation on the roof garden as they have special grooves and edge connections that allow rainwater to pass to drainage systems easily.
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The drainage layer on the roof garden is used to quickly discharge the rainwater from the vegetation layer into the drainage system, as well as to collect excess water.
The geotextile fabric layer is used to separate the drainage layer and plants growing in soil. It prevents the depositing of soil and other fine particles that clogs the drainage system.
It also counteracts the reduction of water rapidly from the vegetation layer by circulating the moisture.
The vegetation layer means the growing medium (soil), the surface where you’ll grow plants and greenery. The growing medium should have good air circulation and it has to be water permeable. Soil is preparation is done according to the plants you’re growing. Generally, plants require fertile and slightly acidic soil, which can be prepared by mixing garden soil, humus, farm manure or compost and organic matter.
The thickness of the growing medium depends on the type of plants you will grow in it.
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Roof areas can be used to create decorative vegetation, or edible garden or to create a low maintenance garden. The rooftop garden is sufficient to grow various forms of vegetation: shrubs, grasses, herbs, vegetables and even dwarf fruit trees depending on what you wish to grow, climate, budget, available space and the functioning of the roof.