Intensive vs. Extensive Green Roofing « Online Medical Observer. The depth of an intensive green roof ranges from 15 cm to as much as 150 cm, and can easily weigh as much 300 to more than 1500 kg/m2. This can improve people’s general sense of health and well-being, as well as overall neighbourhood quality. Blackdown Intensive substrate is required; the substrate contains more organic matter than other green roof types, and is designed to support a wider variety of plants and trees. A green roof or living roof is a roof of a building that is partially or completely covered with vegetation and a growing medium, planted over a waterproofing membrane.It may also include additional layers such as a root barrier and drainage and irrigation systems. Extensive roofs (click here for more) are more often used for single family and multi-family residential buildings. They therefore need to be installed on a much stronger structure. GRHC members are an excellence source of green roof expertise, and a resource manual is available from GRHC's Green Infrastructure Store. Urban agriculture on green roofs would be considered an intensive green roof, as they need regular maintenance, relatively deep soils and a certain amount of irrigation. Permanent irrigation systems incorporated into the scheme will also have maintenance schedules. 1999). Habitat. As parks and gardens, they need frequent maintenance, just as a park or garden needs to be tended on a regular basis. The thickness of the substrate layer depends on the desired vegetation. The vegetation for this roof needs a lot of water and regular maintenance. Semi Intensive Green Roofs Semi-Intensive Green Roof - A semi-intensive green roof system is characterized by small herbaceous plants, ground covers, grasses and small shrubs, requiring moderate maintenance and occasional irrigation. Questions? Pingback: Green Roof FAQ | Green Roof Plan. Reduced storm water runoff. Construction / Installation. The weight of an intensive green roof system is critical for a particular type of plant, and the minimum intensive green roof thickness should ranges from 150mm for a wild grassland, 300mm for bushes, and 3 meters in height and at least 400mm upper substrate and 250 mm lower substrate for small trees of approximately 10 meters. Intensive green roofs are intended to replicate what can typically be found at ground level in the natural landscape, and in green spaces such as parks or cultivated gardens. Sound proofing. A semi-intensive green roof can include characteristics of both extensive and intensive roofs. Intensive and extensive green roofs. Typically, extensive green roofs rely on a mixture of grasses, mosses, sedums, sempervirums, festucas, irises and wildflowers plants that are native to drylands, tundras, alvars and alpine slopes. Through the process of photosynthesis, carbon dioxide is removed from the atmosphere and stored as carbon in biomass. A 2006 study by the University of Michigan comparing costs of conventional and green roofs showed that, on average, installing a green roof costs about $22.00/sq. The maintenance is regular and depends on the landscape design and the chosen plant material. - Waterproofing with high elasticity and great durability. Intensive green roofs generally require an irrigation system and regular maintenance, just as … google_ad_client = "ca-pub-5116174247945809"; /* in post2 */ google_ad_slot = "0646706600"; google_ad_width = 468; google_ad_height = 60; Comments? Extensive roofs are thin lightweight roof systems that typically have a planting media measuring 6 to 20 cm deep, while heavier, thicker green roofs are known as intensive roofs and their growing media ranges in thickness from 20 cm to 100 cm. Green roofs which are planted and seeded tend to perform better in the long term. Blackdown Intensive green roofs have a typical substrate depth that ranges from 200-1500mm and require a permanent irrigation system and regular maintenance. Extensive green roof: $8 to $20 per square foot. An extensive green roof offers a number of advantages over an intensive green roof. Le Jardin de toit – Paris Intensive green roofs – maintenance Rooftop garden, Allen & Overy – London. Pedestal supported. They are also best suited to spaces where people are seldom going to be walking on the roof surface. Intensive green roofs have more soil and a deeper growing medium—sometimes several feet—that can support a more diverse plant selection, including small trees. Urban Heat Island Effect – if an urban area has numerous green roofs, heat island effect is lowered. We use cookies to ensure that we give you the best experience on our website. These green roofs also fit outbuildings like sheds and garages very well. These roofs will have grasses, ground covers, flowers, shrubs and even trees. Other names include “low profile” and “performance.” The design is supposed to give high performance to water use and thermal advantages, while keeping the overall weight of the roof low. The installation and maintenance costs of an extensive green roof are relatively low compared to intensive green roofs. Typically these roofs will have more soil and some small shrubs as well as the low-growing wildflowers and sedums found on an extensive roof. An intensive green roof installation incorporates beautiful flora from across the United States, hosting shrubs, assorted flowers, and shade-giving trees. Green roofs are excellent insulators. Intensive Green Roofs, often referred to as ‘Roof Gardens’, can be viewed very much like a garden area and may be landscaped to include trees, lawns, flower beds and paved areas. On an intensive green roof, with few exceptions, the choices are limitless. When the water falls on a typical roof, it’s often funneled off into storm water drains, collecting pollution along the way and polluting our waterways or increasing the amount of sewage to be treated. You can compare an intensive roof to a normal garden, and this is why an intensive green roof is also known as a roof garden or garden roof. [CDATA[ Save money and use fewer energy resources. Less load on the support structure. Of course, your company determines plants and overall design to best suit your specific needs. A simple lawn will need regular mowing and irrigation during summer, whilst a green roof with plenty of trees and shrubs may also need irrigation and attendance to the vegetation. If you continue to use this site we will assume that you are happy with it. Thus, they have more substantial structural loads and need more frequent maintenance … They require more weight and a deeper system build-up. An extensive green roof can reduce sound from outside by 40 decibels, while an intensive roof can reduce sound by 46-50 decibels (Peck et al. In order to accommodate plants that need a lot of room for their roots, such as trees or shrubs, intensive green roofs are deeper. Biodiversity and green roofs – green roof services, Green roofs benefits – improved energy performance, Water quality, rainfall harvesting and green roofs, Green roofs and living walls in the Netherlands, Wild Bees and Green Roofs – London and Switzerland. Intensive green roofs involve intense landscaping, and are suited to roofs with a highly visible presence or public access, and commonly referred as a ‘roof garden’. Some of this info is cited, though I did not actually check the cited studies. // ]]> The intensive green roof uses planting mediums that have greater depth than the extensive green roof. All plants will have fertilizer and water needs and many will require clipping and pruning. According to Penn State research, a green roof will lengthen roof life by two to three times.*. hey there!! do u think that thermal,solar and visible absorptance is different to these types of green roof? Intensive green roofs tend to be areas where greater access and people traffic is envisaged. Below we explain the main differences. Intensive green roofs have a thicker substrate layer and therefore also carry more weight. Intensive green roofs are comparable to soil-bound green areas, such as gardens and park landscapes. Intensive green roofs require the deepest soil and have the greatest impact on the structural design, but they also accommodate all types of plantings including large shrubs and trees. Benches, tables, planter boxes, greenhouses, ponds and fountains offer people places to relax, dine or work in park-like settings. Intensive green roofs can most easily be compared to building a garden on a roof. This can vary from grass/herbs to trees. However, this depth also means that an intensive green roof adds a lot of weight to a building, which your architect or structural engineer will need to account for. The type of roof is also tied to the type of vegetation. Aesthetic appeal. Vegetable and herb gardens fit in well on these rooftops and to a degree their care is slightly easier than ground level gardens since fewer pests and weeds find their way to the higher elevations. You can get a wider variety of plants suited to the conditions offered by this option. The plants and growing medium are absorbing the solar rays, protecting the roofing materials from UV breakdown.The green roof also shields the membrane from extreme temperature variations, another cause of hastened degradation. Rooftop farms, urban roof farms or vegetable farms on roofs are clearly intensive green roofs and require higher nutrient applications and focused … They will often include paths and walkways that travel between different architectural features to provide space where people can interact with the natural surroundings. The word ‘intensive’ actually refers to the amount of input required to maintain a … The intensive green roof uses planting mediums that have greater depth than the extensive green roof. On a sunny, 80-degree-F day, a black roof can reach 180 degrees F; a white roof 120 degrees; and a plant-covered roof 85 degrees. People walk on them mainly for maintenance. There are many modular green roof kits available that might bring the costs down. Green Roof Service LLC / Green Roof Technology specializes in innovative design, smart engineering and turn-key implementation of ground-remote monolithic vegetation, fully integrated Solar Garden Roofs, Green Infrastructure Master Plans, luxury roof-top gardens, effective bio-filtration, natural swimming pools, green walls and intelligent urban agriculture. //