Intensive green roofs* are often associated with residential buildings, hotels or underground parkings. The more complex and heavier greening systems are characterized by a higher installation, maintenance, management effort (regular irrigation and fertilization) which leads to higher costs for the mentioned system type compared to extensive green roofs (chapter 3.2). Intensive green vegetation is often established on roofs that are accessible for public or recreation purposes and also for regular maintenance measures. The intensive green roof type is regularly frequented by humans: Different activities including gardening, relaxing and socializing are designated for intensive green roofs. To enable human activities on green roofs and the integration of larger plants, trees and architectural elements, suitable rooftops need to be relatively flat. The choice of suitable plants has to be greater (than on extensive green roofs) because of the different requirements and applications e.g. Aesthetic and ecological requirements. Appropriate plants for intensive green roofs are mainly trees, shrubs and perennials. The growth media is relatively thick and notably deeper than for extensive systems with integrated low-growing plants (see 3.2). The growth media of intensive green roofs needs to be relatively deep and nutrient rich to support the growth of plants or bigger trees. Beside a variety of plants, different kinds of architectural elements (buildings, solar panels) can be established on intensive green roofs.
*different terms for intensive green roofs used in literature are high-profile/ roof gardens (source: "Green Roofs." Provided in: Reducing Urban Heat Islands: Compendium of Strategies. Draft. https://www.epa.gov/heat-islands/heat-island-compendium)
|Beauty / Appearance||2|
|Usability / Functionality||1|