![]() Irrigation and maintenance requirements are dependent upon the plant species installed. ![]() Typically requiring a substrate depth of 100 – 200mm, a wider range of plants can be included compared to extensive green roofs, including shrubs and woody plants. Intensive green roof systems require a higher level of maintenance, including regular irrigation.Īn intermediate green roof type that can include characteristics of both extensive and intensive roofs. Intensive green roof systems involve using greater substrate depths (usually above 200mm) and often create a larger weight loading on the roof. They are generally accessible and contain features similar to traditional gardens including lawns, trees, shrubs and hard landscaped areas. Intensive green roofs (also termed Roof Gardens) are principally designed to create recreational and amenity spaces for people to enjoy. Intensive systems are generally those types which are used as recreational spaces and often include similar features to traditional parks and gardens such as shrubs, trees, paving, lawns and even water features. Sedum are able to survive on shallow substrate depths, lower nutrient levels and little or no irrigation requirement (when correctly designed and installed irrigation is generally only required in the initial establishment phase, and then very rarely afterwards). Anything is possible from lawns, perennials, shrubs, trees. The maintenance is regular and depends on the landscape design and the chosen plant material. They require more weight and a deeper system build-up. They are usually multifunctional and accessible. There are many species with a range of form and colour, and generally flower from early summer to autumn. Intensive green roofs can most easily be compared to building a garden on a roof. They are drought tolerant, able to withstand extremes in climate and can grow on relatively shallow substrates. Sedum species are well adapted to their use within extensive green roofs. These planting types are able to survive on shallower substrate depths than other types of plants, require lower nutrient levels and little or no irrigation requirement (when correctly designed and installed irrigation is generally only required in the initial establishment phase, and then very rarely afterwards). sedums, grasses, mosses and some wildflower species. They are generally designed to support plants with a lower maintenance requirement, e.g. Green roofs are typically not designed to provide stormwater detention of larger storms (e.g., 2-year, 15-year) although some intensive green roof systems may be designed to meet these criteria. The more prevalent types of green roof which have hardier, more drought tolerant species of plants such as sedums, mosses, and wildflowers fall within the Extensive sector.Įxtensive green roof systems generally provide a visual or biodiversity interest and are considered to be less suitable as an amenity or leisure space. G-2 Intensive green roofs have a growing media layer that ranges from 6 to 48 inches thick. Extensive green roofs are normally intended to be viewed from another location as visual or ecological features, and are usually not trafficked.
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