culinary institute for traditional cusine

3.11.2 GREEN ROOF Green roof is an environmental, social and economical use of the building roof. Green roofs may be installed at any height with an access provided for its maintenance. The planted spaces, Figure 87 GREEN ROOF EXAMPLE may be used to provide human enjoyment and environmental enhancement or energy savings for the users. Broadly, they can be catogorised into two types : 1. Roof gardens : are installed for the access and enjoyment of people. They are also costly to build, require intensive maintenance and are heavy in weight due to the deep soil profiles.

2. Green roofs : are lightweight with thin soil profiles and minimal maintenance requirements. They are cheaper to construct as they are installed for environmental performance and visual improvement only.

Classification Green Roof Systems Traditional roof gardens restricted the planting to containersand planters or used a layer of ordinary soil spread on the roof.The contemporary roof greening systems are however much advanced as they use organic matter instead of soil for the plant growth. The modern green roofs are categorized by the substrate or growing media depth There are three types of systems - intensive (deep), semi-intensive (moderate depth) and extensive (shallow) Finally, small niches are dug into the subtrate and saplings are planted. The remaining functioning and the maintainance of the plants remain similiar to regular gardening.

Working Mechanism After the construction of the roof slab, several layers of water- proofing are applied in order to ensure that there is no leak Of dampness in the future. To further assist an easy drainage system, floor drain trays are often installed which help channel the water in a predetermined location. Another way of doing this is through the use of network of pipes which are more flexible and agile, Once the waterproofing is done, layers of geotextile fabric is applied. This helps the soil and other medium on top of it, retain their place even water runs through them. Furthermore, layers of engineered soil - soil with a variety of mixes for the desired plant species and variety - are laid on top.

This becomes the substrate or the growing medium for the plants Finally, small niches are dug into the subtrate and saplings are planted. The remaining functioning and the maintainance of the plants remain similiar to regular gardening.

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