More stringent water-use and energy-efficiency requirements are among the new requirements to further reduce buildings’ environmental impacts in the 2014 version of the green building standard from ASHRAE, the US Green Building Council and the Illuminating Engineering Society.
The ANSI/ASHRAE/USGBC/IES Standard 189.1-2014, Standard for the Design of High-Performance, Green Buildings Except Low-Rise Residential Buildings, addresses the areas of site sustainability, water-use efficiency, energy efficiency, indoor environmental quality, and the building’s impact on the atmosphere, materials and resources.
The 2014 standard incorporates 67 addenda, reflecting changes made through the public review process since the standard was last published in 2011. Appendix H gives brief descriptions and approval dates of the addenda included in this new edition.
Major changes include:
- Energy: Significant updates are included to reflect the publication of Standard 90.1-2013, Energy Standard for Buildings Except Low-Rise Residential Buildings, including revised building envelope provisions. Fenestration orientation requirements were updated based on new research, as well as changes and updates made to equipment efficiency tables, EnergyStar references and continuous air-barrier requirements.
- Energy Performance, Carbon Dioxide Emissions, and Renewables: Changes and clarifications are included to reflect changes to Standard 90.1. Carbon dioxide emission factors for different energy sources are updated.
- Indoor Environmental Quality: Lighting quality is added to the scope of this section, and requirements are added for lighting controls in specific space types. Requirements for air sealing of filtration and air-cleaning equipment are clarified, and new requirements for preoccupancy ventilation and building envelope moisture management are added.
- Site Sustainability: All site requirements are now mandatory, with prescriptive and performance options moved to the mandatory requirements. Requirements for stormwater management are enhanced, and new requirements added for bicycle parking and for preferred parking for low-emission, hybrid and electric vehicles. New requirements are added for predesign assessment of native and invasive plants.
- Water: More stringent water use requirements are included for toilets, clothes washers, dishwashers and green roofs.
- Building Impacts on the Atmosphere, Materials, and Resources: Requirements are updated for areas to store and collect recyclables, including batteries and electronics. Requirements also are updated for construction waste management and for life-cycle assessment. New requirements are added for multiple-attribute product declaration or certification and for maximum mercury content levels of certain types of electric lamps.
- Construction and Plans for Operation: Requirements related to environmental impacts associated with idling construction vehicles are updated. New requirements are added to reduce the entry of airborne contaminants associated with construction areas.
Construction of green buildings rose to 325 million square meters of new floor space in 2013, representing a $260 billion market, according to an October report by Lux Research.