LEED® standards

in full  Leadership in Energy and Environmental Design standards 

      a certification program devised in 1994 by the U.S. Green Building Council (USGBC; founded 1993) to encourage sustainable practices design and development by means of tools and criteria for performance measurement. It is “a voluntary, consensus-based, market-driven building rating system based on existing proven technology.” The USGBC has established standards for new construction and major renovation as well as existing structures; their standards can be applied to core and shell and to commercial interiors—i.e., the core and shell alone can be certified with no requirement that the interior be so certified. Many building types—schools, offices, retail, health care facilities, and private residences—have been addressed, and standards for neighbourhood development are also in progress.

      The five critical areas of focus, as laid out by the USGBC, are “sustainable site development, water savings, energy efficiency, materials selection, and indoor environmental quality.”
● Sustainable site development involves, whenever possible, the reuse of existing buildings and the preservation of the surrounding environment. The incorporation of earth shelters, roof gardens, and extensive planting throughout and around buildings is encouraged.
● Water is conserved by a variety of means including the cleaning and recycling of gray (previously used) water and the installation of building-by-building catchments for rainwater. Water usage and supplies are monitored.
● Energy efficiency can be increased in a variety of ways, for example, by orienting buildings to take full advantage of seasonal changes in the sun's position and by the use of diversified and regionally appropriate energy sources, which may—depending on geographic location—include solar, wind, geothermal, biomass, water, or natural gas.
● The most desirable materials are those that are recycled or renewable and those that require the least energy to manufacture. They ideally are locally sourced and free from harmful chemicals. They are made of nonpolluting raw ingredients and are durable and recyclable.
● Indoor environmental quality addresses the issues that influence how the individual feels in a space and involves such features as the sense of control over personal space, ventilation, temperature control, and the use of materials that do not emit toxic gases.

      LEED ratings in order of value from lowest to highest, based on the number of points assigned for green compliance, are Certified, Silver, Gold, and Platinum.

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Universalium. 2010.

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