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Refrigerants have ozone depletion potential (ODP) and global warming potential (GWP) due to greenhouse gas emissions. Low values of each are best for refrigerant choices. These concepts are important when considering refrigerants in a LEED certified project.
Within the materials category, the main focus of LEED is on materials that have a reduced life cycle impact considering at least a cradle to grave scope. Material Life Cycle Analysis is part of the core concepts on which the LEED rating system is based.
The Solar Reflectance Index (SRI) is a measure of a roof’s ability to reject solar heat. It is expressed in values from 0-100, with 0 being most likely to absorb and radiate heat and 100 being the most reflective. In LEED, the use of roofs with a high SRI value is promoted in order to mitigate the heat island effect. The concept of heat island effect and the different mitigation strategies are part of the core concepts on which the LEED rating system is based.