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.

“The new standard updates all of its sections to reflect the latest information available to the committee,” said Andrew Persily, chair of the Standard 189.1 committee. “Compliance with these updated provisions will help further reduce energy and environmental impacts through high performance building design, construction, and operation while providing indoor environments that support the activities of building occupants.”

According to ASHRAE, the major changes in the 2014 edition 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.

For more information or to order a copy of the standard, visit www.ashrae.org/bookstore.