An intensive green roof has a thicker layer of growing medium, so it can contain a variety of vegetation, including grasses, ornamentals, flowers and small trees. Feasibility of combining solar panels and green roofs on the. Planning guide system solutions for extensive green roofs. Today, there are primarily two types of green roofs known either as extensive or intensive. The terms green roof, living roof, ecoroof, vegetated roof, and rooftop garden 6 7 were used to define two types of green roof types extensive and intensive roof. Carbon sequestration potential of extensive green roofs.
This paper gives an overview of extensive green roofs in london and considers their potential to benefit the conservation of biodiversity. Figure 7 shows a sample of gravel ballasted roof left and the green roof in question right. Longterm vegetation research on two extensive green. Wallbarn has been at the forefront of developments in the extensive green roofing sector for a number of years, and has always. Extensive green roofs have a growing depth of 3 to 6 inches, and are typ ically lighter in weight with a saturated. Between intensive and extensive is a range of intermediate treatments that are typically referred to as semi or simpleintensive. They may include a granular drainage medium multicourse or a synthetic drainage layer multilayer. The story of extensive green roofs in malmo local recycling centers green roof maintenance for simple extensive green roofs is often focused on fertilization. Intensive green roofs can be safely installed on horizontal decks, whereas with extensive green roofs minimum falls of. Although designed to be light weight as compared to intensive systems, these green roofs can still contribute an additional 20. Ecological green roof systems 06 t echnic al s tat emen ts a re s ub jec t t o. Besides mosssedum vegetation, special grasses and herbs can also be planted. Green roofs offer multiple benefits to urban areas such as reduction of heatingcooling needs for the building, urban heat island and stormwater runoff for the region.
It is designed to also give a more seamless and luxurious finish and to provide an instant green roof. The planting medium fills the trays to about 8 inch depth. Feasibility study exploring growth of on extensive green roof. The growing medium depth for an extensive green roof system is typically 6 inches or less. In addition to the mosses, grasses, and sedum of extensive roofs, semiintensive plantings include herbs, flowering plants, taller grasses, and small shrubs. Semiintensive green roofs require a deeper soil layer, but the payoff is in the types of plantings that can be used. It has been previously shown that these levels of fertilizer can be used without harming the stormwater runoff. Extensive roofs are the more typical for stormwater management purposes. The cooling effect of evapotranspiration by vegetation on roofs, combined with the thermal shielding. Comparative life cycle assessment of traditional gravel. Refer to these sections as needed throughout the remainder of this calculation sheet.
The company green roof technology has created their own system for installing solar panels and a green roof together and has done extensive research on the benefits. Pdf on sep 1, 2015, gregory varras and others published design of extensive green roofs for the major school plants of piraeus find, read and cite all the research you need on researchgate. Green roofs are classi cally described by the depth of the growing medium extensive, semiintensive, and intensive. There are already many examples of living roofs in. Selecting plants for extensive green roofs in the united. Unlike traditional black tar roofs, green roofs reduce energy costs by absorbing heat instead of.
At the same time, it enriches the visual urban experience in many different ways. Because of the challenges of selecting plants for shallow media, this publication focuses on extensive green roofs. Our technical experts will be pleased to advise you on specific solutions for your own individual building projects. The plants used should be selfregenerating, predominantly shortgrowing, densely planted, and. A comprehensive study of green roof performance from. Most extensive green roofs will reduce stormwater flows on an annual basis by 50% green roofs also delay stormwater runoff but flow dynamics depend on climate and green roof design. This fairly shallow growing medium supports a limited plant palette, often kept to.
Roof gardens can be designed in nearly every garden. Extensive and biodiverse green roofs are designed to be lightweight and support a low maintenance vegetation landscape which is wind and frost resistant. Extensive green roof an extensive green roof system is characterized of its vegetation, ranging from sedums to small grasses, herbs and flowering herbaceous plants, which need little maintenance and no permanent irrigation system. Green roofs and water quantity buffam and mitchell unpublished data most extensive green roofs will reduce stormwater flows on an annual basis by 50% green roofs also delay stormwater runoff but flow dynamics depend on climate and green roof design. Pengembangan ruang terbuka hijau merupakan suatu solusi untuk menjaga lingkungan dari pemanasan global. Calculation sheet for extensive green roofs step a. Harvesting the sun 1825 kb the performance potential of the fully integrated solar garden roof. Forschungsgesellschaft landschaftsentwicklung landschaftsbau guideline for the planning, execution and upkeep of green roof sites. As discussed in analysis i, the green roof selected to be installed is an extensive system. Selecting plants for extensive green roofs in the united states. Guidance in this guide focuses on extensive green roof design.
The generic green roof model should be used if no detailed information about the substrate type or no measured data for the atmospheric. An extensive green roof is a completely natural form of roof covering that uses a lowmaintenance planting scheme consisting of hardy, droughtresistant plants. Extensive green roofs, such as the one utilized in this study, commonly have shallow substrates with a range of 220 cm, necessitate less maintenance, and serve to be more functional than intensive green roofs dunnett and kingsbury 2004. Site planning recommendation define goals and primary function of extensive green roof based on the extensive green roof step by step design procedures beginning on page 18. Intensive green roofs are the most demanding category of such constructions. The vast majority of plants used on extensive or intensive green roofs thrive best within a specific airtowater ratio range in the root zone of a green roof system. Extensive green roofs have a growing depth of 3 to 6 inches, and are typ ically lighter in weight with a saturated weight of 15 to 30 pounds per square foot. Green roof components growing media water holding capacity field capacity, maximum water capacity astm test. Categories of green roofs described include grass roofs. Jun 01, 2014 extensive green roof is the least expensive among the three types of green roofs in terms of installation as well as maintenance, as it can be selfretained. Aboveground biomass was sampled in quadruplicate on each roof with a. Cincinnati civic garden center roof example rain event 12mm from july green roofs and water quantity.
The drainage layer should consist of synthetic or inorganic materials e. Unlike intensive green roofs, extensive green roofs require little upkeep or maintenance. The modules are 4ft by 4ft plastic trays with builtin drainage channels. Extensive green roofs are characterized by a shallower depth of substrate layer less than 15 cm and have a lower weight in comparison to. In this study, the performance of two extensive green roofs located in the city of toronto, ontario, canada was monitored. Since the installation of extensive green roofs is easier and more flexible, most of the researches focused on the harsh environment on extensive green roofs provided. Liveroof has developed the following technical detail drawings for use in plans, and to accompany specifications. Pdf design of extensive green roofs for the major school. The costs and benefits of the extensive green roof are averaged between a 3inch multicourse extensive profile and a 6inch semiintensive profile. Inspection and maintenance once or twice per year water and nutrient supply mostly by natural means plant communities close to nature.
Two studies were conducted in the united states to meet these objectives. The extensive green roof studied is the first pilot implementation cofunded by the undp cedro project and the central bank bdl located on top of one of the buildings at the bdl compounds in hamra. Green roofs reduce the energy required for heating and cooling. Sedum based extensive green roofs in michigan and four roofs in maryland table 1. The following specification outlines the requirements green roof assembly protection course. Pdf green roof systems are living vegetation installed on the roofs and could contribute positively to the mitigation of urban heat island and.
When designing intensive green roofs, these high loadings must be taken into consideration. This type of green roof requires a greater weight bearing capacity and more frequent maintenance. The first, the intensive green roof, or roof garden, generally features trees and other large plants and requires deep soils, intensive labor, and high maintenance, and its purpose is usually ornamental. Zinco extensive green roofs are installed in accordance with current standards and with system. Two extensive green roofs in berlin introduction there are two types of green roof. In addition, the runoff water from most of these roofs was directed to. According to breuning 2015 extensive green roof can weigh from 73kgm. The most prominent feature of this system is its 6 layer of growing medium, gaiasoil, a low density mixture of compost and.
Elmich extensive technical specifications green roof. An evaluation study of plants for use on green roofs. Extensive greenroofs extensive greenroofs on the other hand, are lightweight and only support the heartiest of plants. Sedum roofs are the predominant type of extensive green roof in london. G2 intensive green roofs have a growing media layer that ranges from 6 to 48 inches thick. Green roofs both intensive and extensive for buildings have been. The university of texas at arlington extensive green roof. They are recognized as a benchmark set of guidelines for green roofs in germany. Pdf design of extensive green roofs for the major school plants. The growing media is applied with a minimum depth of 2. Dec 15, 2017 the green roof helps cool the surrounding air, providing a cooler temperature that allows the solar panels to perform more effectively environmental protection agency 2017. Pdf pembangunan extensive green roof technology rifki. Hydrological performance of extensive green roofs in new york. Their advice proved to be only partially useful as almost all of the extensive green roofs in the united states have been constructed in more temperate climates such as those in illinois, washington state, and canada.
Pdf extensive green roofs in london gary grant academia. Elmich extensive green roof universal studios, singapore airborne contaminants, enhances sound attenuation and prolongs the life of the waterproofing membrane as well as the roof skin by shielding the roof from daily sunlight and uv exposure. The green roofs varied in system components, types and. Namun, ada sebuah masalah untuk menghijaukan suatu kota atau area perumahan karena harga tanah juga relatif mahal. Extensive green roofs are often not accessible and are characterized by. Green roofs are typically not designed to provide stormwater detention of larger storms e. Feasibility of combining solar panels and green roofs on. Extensive green roof design using a modular roof top garden system as manufactured by green tech inc. The models were developed for extensive green roofs with a substrate thickness up to 15 cm. Extensive green roofs normally have a shallow growing medium and are designed to be relatively selfsustaining.
Ornamental sedum vegetation consists of a wide variety of species which results in a long blooming period and allows for different accents throughout the. A green roof is a layer of vegetated media installed on top of a conventional. We have vegetative roof details in pdf, dwg autocad, and autodesk revit rvt 2d and rfa 3d formats. Aboveground biomass was determined on eight sedum based extensive green roofs in michigan and four roofs in maryland table 1. Astm tests for media properties the national roofing contractors association nrca green roof systems manual international germany f. Guideline for the calculation of extensive green roofs. In the winter, green roofs insulate the upper floors of buildings and in the summer they cool buildings through shading and the process of evapotranspiration by plants. A typical sedum mat is 20 millimeters thick and is delivered as a roll and laid onto 50 to 70 millimeters of growing mediumtypically crushed brick or light, expanded clay aggregate. The most popular type of green roof, sedum roofs are extensive green roofs that have a total depth of 3 to 8 inches.
Extensive green roofs consist of a thin substrate layer and a layer of mosssedum vegetation, which may be supplemented with herbs and grasses. The extensive green roof is simpler compare to intensive green roof because its lightweight and requires low maintenance and drought resistant plants usually sedum species are used. Extensive green roofs consist of a thin layer of growing medium 15 centimetre depth or less with a herbaceous vegetative cover. Pdf on sep 1, 2015, gregory varras and others published design of extensive green roofs for the major school plants of piraeus find, read and cite all the. The two basic types of green roof systems extensive and intensive are differentiated mainly by the cost,depth of growing medium and the choice of plants. Sedum carpet is applied, especially if both, the load often bearing capacity of the roof and the expenses for maintenance, are restrictive. G1 extensive green roofs have a much shallower growing media layer that typically ranges from 3 to 6 inches thick.
1092 885 763 1239 1414 1422 1295 773 1283 652 598 1253 925 379 792 31 430 187 387 16 1531