Extensive Green Roof Layers

The soil is usually not more than 5 deep and is sometimes contained by a tray system which provides a barrier to excessive growth protects the roof membrane and also interlocks the.

Extensive green roof layers.

Comparison of the various green roofs an extensive green roof is characterised by its low weight a thin layer of growing medium green substrate a mix of plants adapted to conditions on the roof minimum maintenance and low installation costs. Green roofs are also known as vegetative or eco roofs. A green roof is a layer of vegetation planted over a waterproofing system that is installed on top of a flat or slightly sloped roof. Examples of extensive green roofs.

Typically they have thin layers of substrate the growing medium to keep depth and weight to a minimum. It also has plants and the like on top. Green roofs have traditionally been categorised as extensive or intensive. Extensive green roofs are designed to be low maintenance lightweight systems with no general access.

To make this process work various green roof layers are created to give it the most effective and solid chance of being. Intensive green roofs are comparable to soil bound green areas such as gardens and park landscapes. Vegetative roofs also known as green roofs are thin layers of living vegetation installed on top of conventional flat or sloping roofs. The vegetation consists of lawns shrubs and trees and can easily be combined with pedestrian and vehicular pavements.

By alan burchell rubyana lyon green roof mar 3 2017. Each green roof is unique as their designs and performance vary by region climate and building type and use. They fall into three main categories extensive intensive and semi intensive. Types of green roofs.

They generally have lower water requirements and use small low growing plant species particularly succulents. Three types of green roofs exist. In short a green roof is made to purposely grow grass. The bronx county courthouse features a 1 inch drainage layer with a 2 5 3 inch deep growing medium profile the green roof is composed of a mix of sedums and hardy herbs with a sweeping crescent of small grasses.

We have chosen to use the word vegetative rather than the word green in this guide because a non vegetative roof could be considered to be environmentally green without being vegetative. Extensive green roofs are lightweight with a shallow layer of growing substrate of less than 200 mm deep requiring minimal maintenance. Extensive green roofs sedum roof systems. The vegetation for this roof needs a lot of water and regular maintenance.

Extensive semi intensive and intensive green roofs.