![]() The sturdier, heavier soil base also allows extensive systems to be used as roof gardens. The deeper soil allows more plant diversity, including a wide range of vegetables, shrubs, and sometimes even trees, which can make them more attractive than extensive roofs in the dry season. Intensive green roof (so called because they are more labor intensive) have a deeper soil-typically eight to 24 inches-and heavier weight than extensive green roofs. Intensive green roofs have a deep soil, which can support a wide variety of plants. Because they are lightweight and require only a minimum of care, extensive green roofs are usually less expensive to install and maintain than intensive green roof systems. The vegetation may brown out over dry summers, but the plants revive once the rainy season begins. The underlying trays can be removed, allowing access for checking the underlying roofing membranes.Įxtensive green roofs are designed to be self-sustaining and require minimal maintenance: checking roof drains, an annual weeding, and perhaps an application of slow-release fertilizer to promote growth. The vegetation grows approximately one inch over the trays and forms a seamless layer with the plants in adjacent trays.Įxtensive green roofs place less of a load on the roof than the deeper and heavier intensive green roof systems, but they are not designed for heavy foot traffic. In one popular type of extensive system, the soil and vegetation is contained in modular trays that rest on the roof. The soil holds grasses, sedum (species of succulent, water-storing plants), wildflowers, and mosses-plants that can thrive in a rooftop environment with limited water, shallow roots, and sparse nutrients. Green roofing systems consist of several layers, including vegetation, growing medium, and protective root barrier.Įxtensive green roofs have a shallow soil base, usually a formulated compost two to six inches deep. The main differences between the two are soil depth, weight, cost, maintenance, plant selection, and function. There are two basic types of green roof systems: extensive and intensive. Green roofs typically have a protective root barrier underneath the vegetation and soil, a standard roofing membrane, and for some systems, a structural support system. ![]() What Is a Green Roof?Ī green roof-sometimes called a sustainable roofing system, eco-roof, rooftop garden, vegetated rooftop, or sky garden-consists of layers of vegetation and specially engineered soil laid over a conventional roofing surface. Vegetation and soil add extra layers of insulation to roofs, lowering heating and cooling costs as well as dampening noises.Īnswers to commonly asked questions about green roofs. ![]() How Much Should Your Building Have in Reserves?Īltering Your Building: It's Not Just an Ordinary Facelift New York City's Energy Efficiency Legislation Window Replacement in an Historic District How Much Should Your Building Have in ReservesĪfrica Israel Sued for Not Disclosing RAND Reportįunding Assistance for Historic Properties Green Roof Tax Abatement Renewed and Raised RAND Partners with NYSERDA in Multifamily Performance Program New York City's Energy Efficiency Legislation Mandates Benchmarking, Energy Audits, and Retro-commissioning
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